Template:ID-ParasiteGallery

Parasite Gallery

A

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• Acanthocephaliasis Return to Top

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• Bolbosoma spp. Return to Top

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  Transverse section through the body wall of Bolbosoma sp. in an intestinal biopsy specimen, stained with H&E. Image taken at 100x magnification. Cetaceans are the normal definitive hosts for Bolbosoma spp., and humans usually become infected after eating under-cooked fish which serve as paratenic hosts for the parasite.
  Adapted from CDC
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  Higher-magnification (200x) of the specimen in Figure 1. Identifiable in this image are the characteristic thin cuticle (CU, black arrow), syncytial epidermis (EP), longitudinal muscles (blue arrows) and eggs (green arrows).
  Adapted from CDC
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  Transverse section through the body wall of Bolbosoma sp. in an intestinal biopsy specimen, stained with H&E. Image taken at 100x magnification. In this image, a portion of the reproductive system is visible within the pseudocoelom.
  Adapted from CDC

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• Macracanthorhynchus hirudinaceous Return to Top

Eggs of M. hirudinaceous

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  Eggs of M. hirudinaceous in an unstained wet mount of stool.
  Adapted from CDC
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  Egg of M. hirudinaceous in an unstained wet mount of stool.
  Adapted from CDC
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  Image of the same egg in Figure 2, but in a different plane of focus, showing the textured exterior.
  Adapted from CDC

Adults of M. hirudinaceous

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  Adult of M. hirudinaceous.
  Adapted from CDC
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  Higher magnification of the specimen in Figure 1, showing a close-up of the anterior end and the proboscis containing hooks.
  Adapted from CDC
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  Cross-section of the intestine of a pig, stained with H&E, showing the anterior end of an adult Macracanthorhynchus hirudinaceous embedded within the intestinal wall.
  Adapted from CDC

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• Moniliformis moniliformis Return to Top

Eggs of M. moniliformis

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  Eggs of M. moniliformis liberated from an adult worm that was recovered from the stool of a patient.
  Adapted from CDC
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  Egg of M. moniliformis liberated from an adult worm that was recovered from the stool of a patient.
  Adapted from CDC

Adults of M. moniliformis

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  Adult of M. moniliformis.
  Adapted from CDC
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  Adult of M. moniliformis.
  Adapted from CDC
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  Higher magnification of the anterior end of the specimen in Figures 1 and 2, showing a close-up of the proboscis.
  Adapted from CDC
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  Higher magnification of the anterior end of the specimen in Figures 1 and 2, showing a close-up of the proboscis.
  Adapted from CDC

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• African trypanosomiasis (Sleeping sickness) Return to Top

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• Trypansoma brucei Return to Top

Trypansoma brucei ssp. in thick blood smear stained with Giemsa

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  Trypansoma brucei ssp. in a thick blood smear stained with Giemsa.
  Adapted from CDC
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  Trypansoma brucei ssp. in a thick blood smear stained with Giemsa.
  Adapted from CDC
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  Trypansoma brucei ssp. in a thick blood smear stained with Giemsa.
  Adapted from CDC

Trypansoma brucei ssp. in thin blood smear stained with Giemsa

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  Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa.
  Adapted from CDC
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  Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa.
  Adapted from CDC
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  Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa.
  Adapted from CDC
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  Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa.
  Adapted from CDC

Trypansoma brucei ssp. in thin blood smears stained with Wright-Giemsa

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  Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
  Adapted from CDC
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  Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
  Adapted from CDC
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  Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
  Adapted from CDC
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  Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
  Adapted from CDC
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  Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
  Adapted from CDC
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  Trypanosoma brucei ssp. in a thin blood smear stained with Wright-Giemsa.
  Adapted from CDC

Trypansoma brucei ssp. in thin blood smear, beginning to divide

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  Trypanosoma brucei ssp. in a thin blood smear stained with Giemsa. The trypomastigote is beginning to divide; dividing forms are seen in African trypanosomes, but not in American trypanosomes.
  Adapted from CDC

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• Amebiasis Return to Top

Amebiasis cysts

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  Cyst of E. histolytica/E. dispar stained with trichrome. Note the chromatoid body with blunt ends (red arrow).

Amebiasis trophozioites

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  Trophozoites of E. histolytic with ingested erythrocytes stained with trichrome. The ingested erythrocytes appear as dark inclusions. The parasite above show nuclei that have the typical small, centrally located karyosome, and thin, uniform peripheral chromatin.
  Adapted from CDC
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  Entamoeba histolytica trophozoites in colon tissue stained with H&E.
  Adapted from CDC

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• American trypanosomiasis (Chagas disease) Return to Top

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• Trypanosoma cruzi Return to Top

Trypanosoma cruzi in thick blood smears stained with Giemsa

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  Trypanosoma cruzi in thick blood smears stained with Giemsa.
  Adapted from CDC

T. cruzi in thin blood smears stained with Giemsa

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  T. cruzi trypomastigote in a thin blood smear stained with Giemsa. Note the typical C-shape of the trypomastigote that characterizes T. cruzi in fixed blood smears.
  Adapted from CDC
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  T. cruzi trypomastigote in a thin blood smear stained with Giemsa.
  Adapted from CDC
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  T. cruzi trypomastigote in a thin blood smear stained with Giemsa.
  Adapted from CDC
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  Higher magnification of Figure 3, T. cruzi.
  Adapted from CDC

T. cruzi in cerebrospinal fluid (CSF) stained with Giemsa

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  Trypanosoma cruzi trypomastigote in cerebrospinal fluid (CSF) stained with Giemsa.
  Adapted from CDC
  

T. cruzi amastigotes in heart tissue

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  Trypanosoma cruzi amastigotes in heart tissue. The section is stained with hematoxylin and eosin (H&E).
  Adapted from CDC
  
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  Trypanosoma cruzi amastigotes in heart tissue. The section is stained with H&E.
  Adapted from CDC
  

T. cruzi epimastigotes, from culture

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  Trypanosoma cruzi epimastigotes from culture. Note the location of the kinetoplast anterior to the nucleus.
  Adapted from CDC
  

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• Ancylostomiasis (Hookworm) Return to Top

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• Ancylostoma braziliense Return to Top

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• Ancylostoma caninum Return to Top

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  Anterior end of an adult of Ancylostoma caninum, a dog parasite that has been found to produce a rare human infection known as eosinophilic enteritis.
  Adapted from CDC

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• Ancylostoma ceylanicum Return to Top

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• Ancylostoma duodenale Return to Top

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  Adult worm of Ancylostoma duodenal. Anterior end is depicted showing cutting teeth.
  Adapted from CDC

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• Necator americanus Return to Top

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  Adult worm of Necator americanus. Anterior end showing mouth parts with cutting plates.
  Adapted from CDC

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• Angiostrongyliasis Return to Top

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• Angiostrongylus cantonensis Return to Top

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  Angiostrongylus cantonensis third stage (L3), infective larva recovered from a slug. Image captured under differential interference contrast (DIC) microscopy.
  Adapted from CDC
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  A. cantonensis (L3), infective larvae recovered from a slug. Image captured under DIC microscopy.
  Adapted from CDC
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  Higher magnification of Image 2. Note the terminal projection on the tip of the tail which is characteristic of A. cantonensis.
  Adapted from CDC
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  Angiostrongylus cantonensis third stage (L3), infective larva, in a wet mount, recovered from a slug. Note the terminal projection on the tip of the tail which is characteristic of A. cantonensis.
  Adapted from CDC
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  A. cantonensis L3, infective larvae, in wet mounts, recovered from slugs.
  Adapted from CDC
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  A. cantonensis L3, infective larvae, in wet mounts, recovered from slugs.
  Adapted from CDC

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• Angiostrongylus costaricensis Return to Top

A. costaricensis Eggs

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  Angiostrongylus costaricensis eggs in intestinal tissue stained with hematoxylin and eosin (H&E).
  Adapted from CDC
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  Thin-shelled A. costaricensis eggs in intestinal tissue stained with H&E, a feature consistent with the presence of mature female worms.
  Adapted from CDC
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  A. costaricensis first stage (L1) larva in intestinal tissue stained with H&E
  Adapted from CDC

A. costaricensis adult female in tissue sections stained with H&E

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  Angiostrongylus costaricensis female worm in appendix tissue sections stained with hematoxylin and eosin (H&E). Image courtesy of Regions Hospital, St. Paul, MN.
  Adapted from CDC
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  Higher magnification of the specimen in Figure 1. Notice the thick, multinucleate intestine (IN) and eggs (EG) within the uterus (UT).
  Adapted from CDC
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  Another image from the specimen seen in Figure 1.
  Adapted from CDC
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  Higher magnification of the specimen in Figure 3. Shown here are the thick, multinucleate intestine (IN), reproductive tubes (RT), and lateral chords (LC).
  Adapted from CDC

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• Anisakiasis Return to Top

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• Anisakis simplex Return to Top

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  Cross-section of Anisakis sp., viewed under DIC microscopy.
  Adapted from CDC
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  Higher magnification of the specimen in Figure 1. Note the tall, prominent muscle cells (MU) and Y-shaped lateral chords (LC), characteristic for this genus.
  Adapted from CDC

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• Pseudoterranova decipiens Return to Top

Pseudoterranova sp. larval worms

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  Anterior ends of Pseudoterranova sp. worms; images taken at 40x and 200x magnification, respectively.
  Adapted from CDC
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  Anterior ends of Pseudoterranova sp. worms; images taken at 40x and 200x magnification, respectively.
  Adapted from CDC
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  Anterior end of Pseudoterranova sp. The red arrow indicates the intestinal cecum.
  Adapted from CDC
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  Close-up of the intestinal cecum in the same specimen seen in Figure 3.
  Adapted from CDC
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  Mid-section of a Pseudoterranova sp. worm, showing the esophagus and intestine. Image taken at 40x magnification.
  Adapted from CDC
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  Posterior end of Pseudoterranova sp. Image taken at 200x magnification.
  Adapted from CDC

Cross sections of Pseudoterranova sp. worms Cross sections of anisakid worms.

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  Cross-section of Pseudoterranova sp. Note the large butterfly-shaped lateral chords (black arrows), characteristic for this genus.
  Adapted from CDC
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  Cross-section of Pseudoterranova sp. viewed under differential interference contrast (DIC) microscopy.
  Adapted from CDC

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• Ascariasis Return to Top

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• Ascaris lumbricoides Return to Top

Adult A. lumbricoides

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  Adult female A. lumbricoides.
  Adapted from CDC

Unfertilized egg of A. lumbricoides

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  Unfertilized egg of A. lumbricoides in an unstained wet mount, 200x magnification.
  Adapted from CDC

Fertilized egg of A. lumbricoides

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  Fertilized egg of A. lumbricoides in unstained wet mounts of stool, with embryos in the early stage of development.
  Adapted from CDC

A. lumbricoides in tissue specimen

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  Eggs of A. lumbricoides in an appendix biopsy, stained with H&E. This image was taken at 200x magnification.
  Adapted from CDC

B

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• Babesiosis Return to Top

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• Babesia divergens Return to Top

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• Babesia microti Return to Top

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  Babesia microti in a thin blood smear stained with Giemsa. Babesia sp. cannot be identified to the species level by morphology alone; additional testing, such as PCR, is always recommended.
  Adapted from CDC
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  Babesia microti in a thin blood smear stained with Giemsa. Babesia sp. cannot be identified to the species level by morphology alone; additional testing, such as PCR, is always recommended. Note the tetrad form in this image.
  Adapted from CDC
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  Babesia microti in a thin blood smear stained with Giemsa. Note the intra-erythrocytic vacuolated forms indicated by the black arrows.
  Adapted from CDC

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• Balantidiasis Return to Top

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• Balantidium coli Return to Top

B. coli cysts

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  B. coli cysts in a wet mount, unstained.
  Adapted from CDC

B. coli trophozoites

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  B. coli trophozoite in a wet mount, 500× magnification. Note the visible cilia on the cell surface.
  Adapted from CDC
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  Balantidium coli trophozoites in colon tissue stained with hematoxylin and eosin (H&E) at 400x magnification.
  Adapted from CDC

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• Baylisascariasis Return to Top

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• Baylisascaris procyonis Return to Top

Baylisascaris procyonis eggs

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  Unembryonated egg of B. procyonis.
  Adapted from CDC
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  Embryonated eggs of B. procyonis, showing the developing larva inside.
  Adapted from CDC

Baylisascaris procyonis larvae

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  Larva of B. procyonis hatching from an egg.
  Adapted from CDC
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  Cross-sections of larvae of B. columnaris in muscle of a laboratory-infected mouse. The larval morphology and microscopic manifestations would be similar with B. procyonis in human tissue. Image taken at 400x magnification.
  Adapted from CDC

Baylisascaris procyonis larvae

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  Larva of B. procyonis hatching from an egg.
  Adapted from CDC
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  Cross-sections of larvae of B. columnaris in muscle of a laboratory-infected mouse. The larval morphology and microscopic manifestations would be similar with B. procyonis in human tissue. Image taken at 400x magnification.
  Adapted from CDC

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• Bed Bugs Return to Top

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• Cimex hemipterus Return to Top

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• Cimex lectularius Return to Top

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  Two adults and one nymph (arrow) of C. lectularius, collected in a hotel in urban Georgia.
  Adapted from CDC
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  Close-up of one of the adults in Figure 1.
  Adapted from CDC
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  Higher magnification of the specimen in Figure 2. Note the reduced forewings (arrow).
  Adapted from CDC
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  Ventral view of the specimen in Figure 2.
  Adapted from CDC
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  Higher magnification of the specimen in Figure 4, showing a close-up of the typical hemipteran piercing-sucking mouthparts (arrow).
  Adapted from CDC
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  Nymph of C. lectularius. The blue marks represent 1 mm.
  Adapted from CDC

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• Bertiella infection Return to Top

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  Eggs of Bertiella sp. liberated from proglottids. The proglottids were shed from a human patient who had lived for a number of years in Africa. In several of these eggs, the pyriform apparatus can be easily seen. Images courtesy of Clinipath Pathology, Perth, Australia.
  Adapted from CDC
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  An egg of Bertiella sp. liberated from a gravid proglottid. The arrows point to the hooklets.
  Adapted from CDC
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  Proglottids of Bertiella sp.
  Adapted from CDC

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• Bertiella mucronata Return to Top

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• Bertiella struderi Return to Top

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  Scolex of Bertiella studeri. Image courtesy of Richard Bradbury.
  Adapted from CDC

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• Blastocystis hominis infection Return to Top

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• Blastocystis hominis Return to Top

Blastocystis hominis cyst-like forms in wet mounts

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  B. hominis cyst-like forms in a wet mount, unstained.
  Adapted from CDC
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  B. hominis cyst-like form in a wet mount, unstained.
  Adapted from CDC

B. hominis cyst-like forms in wet mounts under differential interference contrast (DIC) microscopy

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  B. hominis cyst-like forms in wet mounts under differential interference contrast (DIC) microscopy.
  Adapted from CDC
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  B. hominis cyst-like forms in wet mounts under differential interference contrast (DIC) microscopy.
  Adapted from CDC

B. hominis cyst-like forms in wet mounts stained with iodine

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  B. hominis cyst-like forms in wet mounts stained in iodine.
  Adapted from CDC
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  B. hominis cyst-like forms in wet mounts stained in iodine.
  Adapted from CDC

B. hominis cyst-like forms stained with trichrome

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  B. hominis cyst-like forms stained with trichrome. The nuclei in the peripheral cytoplasmic rim are visible, staining purple.
  Adapted from CDC
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  B. hominis cyst-like forms stained with trichrome. The nuclei in the peripheral cytoplasmic rim are visible, staining purple.
  Adapted from CDC
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  Blastocystis hominis cyst-like forms stained with trichrome.
  Adapted from CDC
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  Blastocystis hominis cyst-like forms stained with trichrome.
  Adapted from CDC
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  B. hominis cyst-like forms stained with trichrome.
  Adapted from CDC
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  B. hominis cyst-like forms undergoing binary fission; stained with trichrome.
  Adapted from CDC
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  B. hominis cyst-like forms stained with trichrome.
  Adapted from CDC

C

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• Cercarial dermatitis (Swimmer’s itch) Return to Top

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• Austrobilharzia variglandis Return to Top

Cercaria of Austrobilharzia variglandis

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  Cercaria of Austrobilharzia variglandis, which can cause cercarial dermatitis.
  Adapted from CDC
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  Cercaria of Austrobilharzia variglandis, which can cause cercarial dermatitis. Note the forked 'tail' and a pair of 'eye spots' near the anterior end.
  Adapted from CDC

Clinical manifestations of Austrobilharzia variglandis

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  Skin of a patient showing the inflammatory response to cercaria in the skin.
  Adapted from CDC

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• Chilomastix mesnili Return to Top

Chilomastix mesnili trophozoites, trichrome stain

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  Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Trophozoite of C. mesnili from a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC

Chilomastix mesnili cysts, trichrome stain

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  Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Cyst of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC
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  Cyst (lower) and trophozoite (upper) of C. mesnili in a stool specimen, stained with trichrome. Image taken at 1000x magnification.
  Adapted from CDC

Chilomastix mesnili cysts in wet mounts

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  Cyst of C. mesnili in a concentrated wet mount of stool, stained with iodine. Image taken at 1000x magnification.
  Adapted from CDC
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  Cyst of C. mesnili in a concentrated wet mount of stool, stained with iodine. Image taken at 1000x magnification.
  Adapted from CDC

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• Clonorchiasis Return to Top

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• Clonorchis sinensis Return to Top

Clonorchis sinensis eggs

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  C. sinensis egg: the small knob at the abopercular end is visible in this image.
  Adapted from CDC
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  C. sinensis egg. Note the operculum resting on "shoulders;" image taken at 400× magnification.
  Adapted from CDC
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  C. sinensis egg; images taken at 400× magnification.
  Adapted from CDC
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  C. sinensis egg; images taken at 400× magnification.
  Adapted from CDC

Clonorchis sinensis adults

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  Adult of C. sinensis.
  Adapted from CDC
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  Adult of C. sinensis stained with carmine. Clearly visible in this image are the oral sucker (OS), pharynx (PH), ceca (CE), acetabulum, or ventral sucker (AC), uterus (UT), vitellaria (VT) and testes (TE).
  Adapted from CDC

Clonorchis sinensis eggs

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  Shells of Parafossarulus manchouricus, the most common snail host of C. sinensis in endemic areas in southeast Asia. Image courtesy of the Web Atlas of Medical Parasitology and the Korean Society for Parasitology.
  Adapted from CDC
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  Bithynia sp., another common intermediate host of C. sinensis. Image courtesy of Michal Maňas.
  Adapted from CDC

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• Coenurosis Return to Top

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• Taenia spp. Return to Top

Gross coenurus specimens

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  Large, polycephalic coenurus removed from the shoulder of a baboon (Papio sp.).
  Adapted from CDC
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  Close-up of a coenurus of T. multiceps removed from the eye of a patient, broken open to show multiple protoscoleces.
  Adapted from CDC

Coenuri in tissue specimens, stained with hematoxylin and eosin (H&E)

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  Coenurus removed from a subcutaneous nodule in the shoulder area of a patient, stained with hematoxylin and eosin (H&E). Image taken at 50x magnification. Although the species was not identified in this case, the pathology is consistent with T. serialis.
  Adapted from CDC
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  Higher magnification (200x) of the coenurus in Figure 1.
  Adapted from CDC
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  Higher magnification (200x) of the same specimen shown in Figures 1 and 2. The black arrows point to hooklets in the protoscoleces.
  Adapted from CDC
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  Higher magnification (200x) of the same specimen shown in Figures 1 and 2. The black arrows point to hooklets in the protoscoleces.
  Adapted from CDC

Coenurus in an eye specimens, stained with hematoxylin and eosin (H&E)

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  Cross-section of a human eye, showing multiple protoscoleces within a coenurus.
  Adapted from CDC
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  Higher magnification (200x) of the coenurus in Figure 1.
  Adapted from CDC
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  Higher magnification (200x) of protoscoleces shown in Figures 1 and 2.
  Adapted from CDC
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  Higher magnification (200x) of protoscoleces shown in Figures 1 and 2.
  Adapted from CDC
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  Higher magnification of the protoscolex in Figure 4, showing multiple hooklets.
  Adapted from CDC

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• Cryptosporidiosis Return to Top

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• Cryptosporidium spp. Return to Top

Cryptosporidium sp. oocysts in a wet mount

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  Cryptosporidium spp. oocysts (pink arrows) in wet mount. A budding yeast (brown arrow) is in the same field.
  Adapted from CDC
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  Cryptosporidium parvumoocysts in wet mount, under differential interference contrast (DIC) microscopy. The oocysts are rounded and measure 4.2 µm - 5.4 µm in diameter. Sporozoites are visible inside the oocysts, indicating that sporulation has occurred.
  Adapted from CDC

Cryptosporidium sp. oocysts stained with trichrome

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  Cryptosporidium sp. oocysts stained with trichrome. Oocysts may be detected, but should not be confirmed by this method. Trichrome staining is inadequate for a definite diagnosis because oocysts will appear unstained. Here the Cryptosporidium oocysts are represented by red arrows; the blue arrow represents yeast.
  Adapted from CDC
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  Cryptosporidium sp. oocyst stained with trichrome. Oocysts may be detected, but should not be confirmed by this method. Trichrome staining is inadequate for a definite diagnosis because oocysts will appear unstained. Here the Cryptosporidium oocyst is represented by a red arrow; the blue arrows represent yeast.
  Adapted from CDC

Cryptosporidium sp. oocysts stained with modified acid-fast

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  Cryptosporidium parvum oocysts stained with modified acid-fast. Against a blue-green background, the oocysts stand out in a bright red stain. Sporozoites are visible inside the two oocysts to the right in this image.
  Adapted from CDC
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  Cryptosporidium parvum oocysts stained with modified acid-fast. Against a blue-green background, the oocysts stand out in a bright red stain.
  Adapted from CDC
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  Cryptosporidium sp. oocysts stained with modified acid-fast.
  Adapted from CDC
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  Cryptosporidium sp. oocyst stained with modified acid-fast.
  Adapted from CDC

Cryptosporidium sp. oocysts unstained on a slide stained with modified acid-fast

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  Cryptosporidium sp. oocysts (red arrows) that did not take up the modified acid-fast stain. The slide was counterstained with methylene blue. Note that yeast cells did stain red (yellow arrows).
  Adapted from CDC
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  Unstained Cryptosporidium sp. oocysts (black arrows) on a slide stained with modified acid-fast. The slide was counterstained with malachite green.
  Adapted from CDC

Cryptosporidium sp. oocysts stained with safranin

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  Cryptosporidium sp. oocysts stained with safranin.
  Adapted from CDC
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  Cryptosporidium sp. oocysts stained with safranin.
  Adapted from CDC

Cryptosporidium sp. oocysts stained with Ziehl-Neelsen modified acid-fast

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  Cryptosporidium sp. oocysts stained with Ziehl-Neelson modified acid-fast. Image contributed by the Oregon State Public Health Laboratory.
  Adapted from CDC

Cryptosporidium parvum oocysts stained with the fluorescent stain auramine-rhodamine

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  Cryptosporidium parvum oocysts stained with the fluorescent stain auramine-rhodamine.
  Adapted from CDC

Oocysts of C. parvum' and cysts of Giardia duodenalis labeled with immunofluorescent antibodies

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  Cryptosporidium sp. oocysts labeled with immunofluorescent antibodies. Images contributed by the Kansas Department of Health and Environment.
  Adapted from CDC
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  Cryptosporidium sp. oocyst labeled with immunofluorescent antibodies. Images contributed by the Kansas Department of Health and Environment.
  Adapted from CDC
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  Cryptosporidium sp. oocysts (yellow arrows) and cysts of Giardia duodenalis (red arrow) labeled with immunofluorescent antibodies.
  Adapted from CDC
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  Cryptosporidium sp. oocysts (yellow arrows) and cysts of Giardia duodenalis (red arrows) labeled with immunofluorescent antibodies.
  Adapted from CDC

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• Cyclosporiasis Return to Top

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• Cyclospora cayetanensis Return to Top

Cyclospora cayetanensis oocysts in wet mounts

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  Oocyst of C. cayetanensis in an unstained wet mount. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
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  Oocyst of C. cayetanensis in an unstained wet mount. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
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  Oocyst of C. cayetanensis in an unstained wet mount of stool. Image taken at 1000x magnification.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis in an unstained wet mount of stool. Image taken at 1000x magnification.
  Adapted from CDC

Cyclospora cayetanensis oocysts stained with trichrome

• 
  Oocyst of C. cayetanensis stained with trichrome; while the oocyst is visible, the staining characteristics are inadequate for a reliable diagnosis.
  Adapted from CDC
• 
  Oocysts of C. cayetanensis stained with trichrome; while the oocyst is visible, the staining characteristics are inadequate for a reliable diagnosis.
  Adapted from CDC

C. cayetanensis oocysts viewed under ultraviolet (UV) microscopy

• 
  Oocyst of C. cayetanensis viewed under UV microscopy.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis viewed under UV microscopy.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis viewed under UV microscopy.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis viewed under UV microscopy.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis viewed under UV microscopy.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis viewed under UV microscopy.
  Adapted from CDC

C. cayetanensis oocysts stained with modified acid-fast

• 
  Oocysts of C. cayetanensis stained with modified acid-fast stain. Note the variability of staining in the four oocysts.
  Adapted from CDC
• 
  Two oocysts of C. cayetanensis stained with modified acid-fast stain. Both oocysts failed to take up the carbol fuschin stain. Image courtesy of the Arizona State Public Health Laboratory.
  Adapted from CDC
• 
  Oocysts of C. cayetanensis stained with modified acid-fast stain. Note the wrinkled edge and the lack of stain in the two oocysts. Image courtesy of the Arizona State Public Health Laboratory.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis stained with modified acid-fast stain.
  Adapted from CDC
• 
  Oocysts of C. cayetanensis stained with modified acid-fast stain.
  Adapted from CDC
• 
  Oocysts of C. cayetanensis stained with modified acid-fast stain.
  Adapted from CDC

C. cayetanensis oocysts stained with safranin (SAF)

• 
  Oocyst of C. cayetanensis stained with safranin (SAF).
  Adapted from CDC
• 
  Oocyst of C. cayetanensis stained with safranin (SAF).
  Adapted from CDC
• 
  Oocyst of C. cayetanensis stained with safranin (SAF).
  Adapted from CDC
• 
  Oocyst of C. cayetanensis stained with safranin (SAF).
  Adapted from CDC
• 
  A pair of oocysts of C. cayetanensis stained with safranin (SAF).
  Adapted from CDC
• 
  Oocyst of C. cayetanensis (yellow arrow) along with an oocyst of Cryptosporidium parvum (red arrow), stained with safranin (SAF). Cryptosporidium spp. also stain with the safranin and modified acid-fast stains.
  Adapted from CDC

C. cayetanensis oocysts viewed under differential interference contrast (DIC) microscopy

• 
  Oocyst of C. cayetanensis viewed under differential interference contrast (DIC) microscopy. The refractile globules are easily visible under DIC.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis viewed under differential interference contrast (DIC) microscopy. The refractile globules are easily visible under DIC.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis viewed under DIC microscopy. There are two sporocysts are visible in this image.
  Adapted from CDC
• 
  Oocyst of C. cayetanensis viewed under DIC microscopy.
  Adapted from CDC
• 
  A pair of oocysts of C. cayetanensis viewed under DIC microscopy.
  Adapted from CDC
• 
  Rupturing oocyst of C. cayetanensis viewed under DIC microscopy. One sporocyst has has been released from the mature oocyst; the second sporocyst is still contained within the oocyst wall.
  Adapted from CDC

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• Cysticercosis Return to Top

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• Taenia solium Return to Top

Larval Taenia solium

• 
  Larval Taenia solium cyst in a section of a lesion found in the right frontal lobe of a patient stained with hematoxylin and eosin (H&E), magnification 40×.
  Adapted from CDC
• 
  An entire cysticercus seen within the bladder walls (blue arrows). A single scolex is visible inside yellow circle) within the cyst.
  Adapted from CDC
• 
  Higher magnification (100×) of the cyst in Figures 1 and 2. The parenchymatous portion of the cysticercus can be better observed.
  Adapted from CDC
• 
  The extensive folding of the spiral canal and one sucker of the scolex (black arrow) are apparent. Calcareous corpuscles can be seen in the fibrous tissues (green arrows).
  Adapted from CDC
• 
  Cross-sections of cysticerci stained with H&E, at 40x magnification
  Adapted from CDC
• 
  Cross-sections of cysticerci stained with H&E, at 100x magnification.
  Adapted from CDC

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• Cystoisosporiasis (Isosporiasis) Return to Top

---

• Cystoisospora belli (Isospora belli) Return to Top

Cystoisospora belli oocysts

• 
  Immature oocyst of C. belli in an unstained wet mount, containing a single sporoblast.
  Adapted from CDC
• 
  Immature oocyst of C. belli stained with safranin, containing a single sporoblast.
  Adapted from CDC
• 
  Immature oocyst of C. belli stained with acid-fast, showing a single sporoblast.
  Adapted from CDC
• 
  Oocyst of C. belli viewed under ultraviolet (UV) microscopy, showing two sporoblasts.
  Adapted from CDC
• 
  Immature oocyst of C. belli in an unstained wet mount showing a single sporoblast.
  Adapted from CDC
• 
  Immature oocyst of C. belli in an unstained wet mount showing two sporoblasts.
  Adapted from CDC
• 
  Same oocyst as in Figure 1 but viewed under differential interference contrast (DIC)
  Adapted from CDC
• 
  Same oocyst as in Figure 2 but viewed under ultraviolet (UV) fluorescent micrscopy.
  Adapted from CDC
• 
  Same oocyst as in Figures 1 and 3 but viewed under ultraviolet (UV) fluorescent micrscopy.
  Adapted from CDC
• 
  Same oocyst as in Figures 2 and 4 but viewed under UV microscopy.
  Adapted from CDC

Cystoisospora belli oocysts, stained with hematoxylin and eoisin (H&E)

• 
  Oocyst of C. belli in the epithelial cells of a mammalian host, stained with H&E (yellow arrow).
  Adapted from CDC
• 
  Oocyst of C. belli in the epithelial cells of a mammalian host, stained with H&E (yellow arrow).
  Adapted from CDC

D

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• Dicrocoeliasis Return to Top

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• Dicrocoelium dendriticum Return to Top

Dicrocoelium dendriticum eggs in wet mounts

• 
  Egg of Dicrocoelium dendriticum in an unstained wet mount of stool. Image courtesy of Dr. Juan Cuadros González.
  Adapted from CDC
• 
  Egg of Dicrocoelium dendriticum in an unstained wet mount of stool. Image courtesy of Dr. Juan Cuadros González.
  Adapted from CDC
• 
  Egg of Dicrocoelium dendriticum in an unstained wet mount of stool. Image courtesy of Dr. Juan Cuadros González.
  Adapted from CDC
• 
  Egg of D. dendriticum in an unstained wet mount of stool.
  Adapted from CDC
• 
  Egg of D. dendriticum in an unstained wet mount of stool.
  Adapted from CDC

Dicrocoelium dendriticum adults

• 
  Adult of D. dendriticum, stained with carmine. Structures illustrated in this figure include: oral sucker (OS), acetabulum (AC), uterus (UT), testes (TE), and vitelline glands (VT).
  Adapted from CDC

Intermediate hosts of Dicrocoelium dendriticum

• 
  Zebrina detrita, a common first intermediate host for D. dendriticum. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Formica fusca, a common second intermediate host for D. dendriticum in Europe. Image courtesy of Sedeer El-Showk.
  Adapted from CDC

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• Dientamoeba fragilis infection Return to Top

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• Dientamoeba fragilis Return to Top

Dientamoeba fragilis binucleate trophozoites stained with trichrome

• 
  Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
  Adapted from CDC
• 
  Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
  Adapted from CDC
• 
  Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
  Adapted from CDC
• 
  Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
  Adapted from CDC
• 
  Binucleate form of a trophozoite of D. fragilis, stained with trichrome.
  Adapted from CDC
• 
  Binucleate form of trophozoites of D. fragilis, stained with trichrome. A cyst-like form of Blastocystis hominis lies to the left of the D. fragilis.
  Adapted from CDC

Dientamoeba fragilis uninucleate trophozoites stained with trichrome

• 
  Uninucleate form of a trophozoite of D. fragilis, stained with trichrome.
  Adapted from CDC
• 
  Uninucleate form of a trophozoite of D. fragilis, stained with trichrome.
  Adapted from CDC
• 
  Uninucleate form of a trophozoite of D. fragilis, stained with trichrome.
  Adapted from CDC
• 
  Binucleate and uninucleate forms of trophozoites of D. fragilis, stained with trichrome.
  Adapted from CDC

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• Dioctophymiasis Return to Top

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• Dioctophyme renale Return to Top

Larvae of Dioctotphyme renale in human tissue

• 
  Cross-sections of larvae of D. renal in a subcutaneous nodule, stained with hematoxylin and eosin (H&E). Images courtesy of the Laboratory of Parasitology, National Public Health Research Center in Vilnius, Lithuania.
  Adapted from CDC
• 
  Cross-sections of larvae of D. renal in a subcutaneous nodule, stained with hematoxylin and eosin (H&E). Images courtesy of the Laboratory of Parasitology, National Public Health Research Center in Vilnius, Lithuania
  Adapted from CDC
• 
  Higher-magnification of the specimens shown in Figures 1 and 2, showing a close-up of the characteristic intestine, with cuboidal, uninucleate cells, pigment, and microvilli.
  Adapted from CDC
• 
  Higher-magnification of the specimens shown in Figures 1 and 2, showing a close-up of the characteristic intestine, with cuboidal, uninucleate cells, pigment, and microvilli.
  Adapted from CDC
• 
  Higher-magnification of the specimens shown in Figures 1-4. Shown in this image are the tall, polymyarian muscle cells, the characteristic ventral chord with a U-shaped row of nuclei (black arrow), and three pseudocoelomic membranes (red arrows).
  Adapted from CDC
• 
  Close-up of Figure 1, showing the ventral chord (black-arrow).
  Adapted from CDC

Eggs of D. renale in animal tissue

• 
  Egg of D. renale in the kidney of a mink, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Egg of D. renale in the kidney of a mink, stained with hematoxylin and eosin (H&E).
  Adapted from CDC

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• Diphyllobothriasis Return to Top

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• Diphyllobothrium latum Return to Top

Diphyllobothrium latum eggs in wet mounts

• 
  Eggs of D. latum in an iodine-stained wet mount. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
• 
  Note the knob at the abopercular end. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
• 
  Eggs of D. latum within a proglottid. Image courtesy of the Florida State Public Health Laboratory.
  Adapted from CDC
• 
  Eggs of D. latum within a proglottid.
  Adapted from CDC
• 
  Eggs of D. latum in an unstained wet mount.
  Adapted from CDC
• 
  Eggs of D. latum in an unstained wet mount of stool. Note the opercula are open.
  Adapted from CDC

Eggs of Diphyllobothrium latum eggs in wet mounts

• 
  Egg of D. latum in an unstained wet-mount of stool.
  Adapted from CDC

Proglottids of Diphyllobothrium latum

• 
  Section of an adult D. latum containing many proglottids. The scolex was not present in this specimen. Image courtesy of the Florida State Public Health Laboratory.
  Adapted from CDC
• 
  Close-up of a few of the proglottids from the specimen in Figure 1, showing the rosette-shaped uterus at the center of each proglottid.
  Adapted from CDC
• 
  Carmine-stained proglottids of D. latum, showing the rosette-shaped ovaries.
  Adapted from CDC
• 
  Carmine-stained proglottids of D. latum, showing the rosette-shaped ovaries.
  Adapted from CDC
• 
  Scolex of D. latum.
  Adapted from CDC

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• Dipylidium caninum infection Return to Top

Dipylidium caninum egg packets in wet mounts

• 
  D. caninum egg packet, containing 8 visible eggs, in a wet mount.
  Adapted from CDC
• 
  D. caninum egg packet in a wet mount.
  Adapted from CDC
• 
  D. caninum egg packet in wet mount.
  Adapted from CDC
• 
  D. caninum egg packet in wet mount.
  Adapted from CDC
• 
  D. caninum egg packet in wet mount.
  Adapted from CDC

D. caninum eggs in wet mounts under conventional and differential interference contrast microscopy

• 
  D. caninum eggs clumped together in a wet mount. Image taken at 200x magnification.
  Adapted from CDC
• 
  D. caninum eggs clumped together in a wet mount. Image taken at 400x magnification, hooklets in the some of the eggs are visible.
  Adapted from CDC
• 
  D. caninum eggs clumped together under differential interference contrast microscopy (same eggs as in Figure 2).
  Adapted from CDC
• 
  Close up of Figure 3. Note the visible hooklets in three of the eggs.
  Adapted from CDC

D. caninum proglottids

• 
  D. caninum proglottid under a dissecting microscope cleared with lactophenol.
  Adapted from CDC
• 
  D. caninum proglottid.
  Adapted from CDC
• 
  D. caninum proglottid partially cleared with lactophenol, showing eggs and egg packets.
  Adapted from CDC
• 
  D. caninum proglottid. The genital pores are clearly visible in the carmine-stained proglottid.
  Adapted from CDC

Cross-section of a D. caninum proglottid stained with hematoxylin and eosin (H&E)

• 
  Cross-section of a D. caninum proglottid stained with H&E. Image taken at 100x magnification.
  Adapted from CDC
• 
  Cross-section of a D. caninum proglottid stained with H&E. Image taken at 200x magnfication.
  Adapted from CDC
• 
  Cross-section of a D. caninum proglottid stained with H&E. Image taken at 400x magnification
  Adapted from CDC
• 
  Cross-section of a D. caninum proglottid stained with H&E. Image taken at 1000x magnification.
  Adapted from CDC

D. caninum scolex

• 
  D. caninum scolex.
  Adapted from CDC

Adult tapeworm of D. caninum

• 
  Adult tapeworm of D. caninum. The scolex of the worm is very narrow and the proglottids, as they mature, get larger.
  Adapted from CDC

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• Dirofilariasis Return to Top

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• Dirofilaria sp. Return to Top

• 
  Cross-section of Dirofilaria sp. from a subcutaneous nodule, stained with hematoxylin and eosin (H&E). Morphologic features visible in this image include tall, prominent muscle cells (MU), coiled vagina (VG), coiled intestine (IN), lateral chords (LC), and prominent internal lateral ridges (IR). Image courtesy of Drs. Dirk Elston and Paul Bourbeau.
  Adapted from CDC
• 
  Cross-sections of Dirofilaria spp. from a subcutaneous scalp nodule, stained with H&E. Image courtesy of the Department of Dermatopathology, University of Michigan, Ann Arbor, MI.
  Adapted from CDC
• 
  Cross-sections of Dirofilaria sp. from a subcutaneous nodule above the right breast of a female patient who traveled to several western European countries, stained with H&E. Image taken at 100x magnification. Image courtesy of Dr. Truus Derks.
  Adapted from CDC
• 
  Higher magnification of the same specimen as Figure 3, taken at 400x magnification. Note the presence of lateral chords (blue arrows) and internal lateral ridge (black arrow).
  Adapted from CDC
• 
  Dirofilaria sp. (suspect D. tennis) removed from the eye of a patient.
  Adapted from CDC
• 
  Close-up of the specimen in Figure 5 showing the cuticular ridging. A uterine tube can also be seen through the cuticle.
  Adapted from CDC

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• Dracunculiasis (Guinea Worm Disease) Return to Top

---

• Drancunculus medinensis Return to Top

A female Dracuncunculus medinensis in a human host

• 
  The female Guinea worm induces a painful blister.
  Adapted from CDC
• 
  After rupture of the blister, the worm emerges as a whitish filament in the center of a painful ulcer which is often secondarily infected. (Images contributed by Global 2000/The Carter Center, Atlanta, Georgia).
  Adapted from CDC

E

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• Echinococcosis (Hydatid disease) Return to Top

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• Echinococcus granulosus Return to Top

Echinococcus granulosus in tissue

• 
  Protoscoleces in a hydatid cyst removed from lung tissue, stained with hematoxylin and eosin (H&E). Image taken at 200x magnification. Image courtesy of Phoenix Children's Hospital, Phoenix, AZ.
  Adapted from CDC
• 
  Higher magnification (600x) of the protoscoleces in Figure 1.
  Adapted from CDC
• 
  Cross-section of an E. granulosus cyst, stained with H&E. The cyst wall is composed of an acellular laminated external layer (green arrow) and a thin, germinal (nucleated) inner layer (yellow arrow). Note the brood capsule (black arrow) with protoscoleces (blue arrows) inside. Image taken at 40x magnification.
  Adapted from CDC
• 
  Higher magnification (200x) of the cyst in Figure 3, showing daughter cyst (brood capsule). Note the hooklets (purple arrow) inside one of the protoscoleces and the calcareous corpuscles (light blue arrows) along the germinal layer.
  Adapted from CDC
• 
  Protoscoleces liberated from a hydatid cyst.
  Adapted from CDC
• 
  Protoscoleces liberated from a hydatid cyst.
  Adapted from CDC

Echinococcus granulosus adults

• 
  Echinococcus granulosus adult, stained with carmine.
  Adapted from CDC
• 
  Close-up of the scolex of E. granulosus in Figure 1. In this focal plane, one of the suckers is clearly visible, as is the ring of rostellar hooks.
  Adapted from CDC

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• Echinococcus multilocularis Return to Top

• 
  Echinococcus multilocularis in liver tissue, stained with hematoxylin and eosin (H&E). Magnification at 200x
  Adapted from CDC
• 
  Higher magnification (400x) of the specimen in Figure 1. Notice a pair of refractile hooks (yellow arrows). Cestode hooks do not stain with H&E but may be visible with proper adjustment of the microscope.
  Adapted from CDC
• 
  Echinococcus multilocularis in tissue, stained with H&E. Magnification at 200x.
  Adapted from CDC
• 
  Higher magnification (400x) of the specimen in Figure 3. Notice the refractile hook (green arrow).
  Adapted from CDC

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• Echinostomiasis Return to Top

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• Echinostoma spp. Return to Top

Echinostoma spp. egg in wet mounts

• 
  Egg of Echinostoma sp. in an unstained wet mount of stool. Image taken at 400x magnification.
  Adapted from CDC

Echinostoma spp. adults

• 
  Adult of E. revolutum, stained with carmine. Structures illustrated in this figure include: oral sucker (OS), armed collar (CL), cirrus sac (CS), ventral sucker, or acetabulum (AC), uterus containing eggs (UT), ovary (OV), paired testes (TE), and vitelline glands (VT). This species has been recorded from humans in Taiwan.
  Adapted from CDC

Echinostoma sp. in tissue, stained with hematoxylin and eosin (H&E)

• 
  Adult Echinostoma removed during a colonoscopy, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Higher magnification of the anterior end of the specimen in Figure 1. Notice the acetabulum (ventral sucker, AC).
  Adapted from CDC
• 
  Higher magnification of the posterior end of the specimen in Figure 1. Notice the vitelline glands (VT) and lobed testes (TE).
  Adapted from CDC
• 
  Higher magnification of the specimen in Figures 1-3. Shown here are eggs (EG) within the size range forEchinostoma spp. (roughly 100 micrometers in length, taking into account they are sections and may not be cut in a perfect horizontal plane).
  Adapted from CDC

Intermediate hosts of Echinostoma spp.

• 
  Lymnaea sp. This snail genus has been recorded as a second intermediate host for E. malayanum. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Radix sp. This snail genus has been recorded as a first intermediate host for E. hortense and a second intermediate host for E. cinetorchis. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Gyraulus sp. This snail genus has been recorded as an intermediate host for E. cinetorchis. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Viviparus sp. This snail genus has been recorded as a second intermediate host for E. cinetorchis and E. hortense. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Corbicula sp. This bivalve genus has been recorded as a second intermediate host for E. lindoense. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC

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• Enterobiasis (Pinworm Infection) Return to Top

---

• Enterobius vermicularis Return to Top

Enterobius vermicularis eggs

• 
  Eggs of E. vermicularis in a cellulose-tape preparation.
  Adapted from CDC
• 
  Eggs of E. vermicularis in a wet mount.
  Adapted from CDC
• 
  Egg of E. vermicularis in an iodine-stained wet mount from a formalin concentrate. Image contributed by the Kansas State Public Health Laboratory.
  Adapted from CDC
• 
  Egg of E. vermicularis teased from an adult worm recovered from a colonoscopy. Image contributed by the South Carolina Department of Health and Environmental Control, Bureau of Laboratories.
  Adapted from CDC
• 
  Eggs of E. vermicularis viewed under UV microscopy.
  Adapted from CDC
• 
  Eggs of E. vermicularis viewed under UV microscopy.
  Adapted from CDC

Enterobius vermicularis adult worms

• 
  Adult male of E. vermicularis from a formalin-ethyl acetate (FEA) concentrated stool smear. The worm measured 1.4 mm in length. Image contributed by the Centre for Tropical Medicine and Imported Infectious Diseases, Bergen, Norway.
  Adapted from CDC
• 
  Close-up of the anterior end of the worm in Figure 1. The esophagus, divided into muscular and bulbous portions and separated by a short, narrow isthmus, is visible in the image, as are the cephalic expansions.
  Adapted from CDC
• 
  Close-up of the posterior end of the worm in Figure 1. Note the blunt end. The spicule is withdrawn into the worm in this specimen.
  Adapted from CDC
• 
  Anterior end of an adult female of E. vermicularis, recovered from a colonscopy. Image contributed by the South Carolina Department of Health and Environmental Control, Bureau of Laboratories.
  Adapted from CDC
• 
  Posterior end of the worm in Figure 4. Note the long, slender pointed tail.
  Adapted from CDC

Enterobius vermicularis in tissue, stained with hematoxylin and eosin (H&E)

• 
  Cross-section of a male E. vermicularis from tissue, stained with H&E. Notice the presence of the alae (blue arrow), intestine (red arrow) and testis (black arrow).
  Adapted from CDC
• 
  Cross-section of an adult female E. vermicularis from the same specimen shown in Figure 1. Note the presence of the alae (blue arrow), intestine (green arrow) and ovaries (black arrows).
  Adapted from CDC
• 
  Cross section of an adult female E. vermicularis stained with H&E, recovered during a colonoscopy. Note the prominent alae (blue arrow) and the presence of eggs (yellow arrow). Image contributed by Sheboygan Memorial Hospital, Wisconsin.
  Adapted from CDC
• 
  Longitudinal section of an adult female E. vermicularis from the same specimen as Figure 3. Note the presence of many eggs.
  Adapted from CDC
• 
  Egg of E. vermicularis in a colon biopsy specimen, stained with H&E.
  Adapted from CDC
• 
  Egg of E. vermicularis in a colon biopsy specimen, stained with H&E.
  Adapted from CDC

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• Enteromonas hominis Return to Top

Enteromonas hominis cysts

• 
  Cyst of E. hominis, possessing four nuclei, in a stool specimen stained with iron-hematoxylin.
  Adapted from CDC
• 
  Cyst of E. hominis, possessing four nuclei, in a stool specimen stained with iron-hematoxylin.
  Adapted from CDC

F

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• Fascioliasis Return to Top

---

• Fasciola hepatica Return to Top

Fasciola hepatica eggs

• 
  Egg of F. hepatica in an unstained wet mount, taken at 400x magnification.
  Adapted from CDC
• 
  Egg of F. hepatica in an unstained wet mount, taken at 400x magnification.
  Adapted from CDC
• 
  Egg of F. hepatica in an unstained wet mount.
  Adapted from CDC

F. hepatica adults

• 
  Unstained adult of F. hepatica fixed in formalin.
  Adapted from CDC
• 
  Adult of F. hepatica stained with carmine.
  Adapted from CDC

F. hepatica adults observed in endoscopic retrograde cholangiopancreatography (ERCP)

• 
  Unstained adult of F. hepatica fixed in formalin.
  Adapted from CDC
• 
  Adult of F. hepatica stained with carmine.
  Adapted from CDC

Intermediate hosts of Fasciola spp.

• 
  Galba truncately, the main intermediate host of F. hepatica throughout most of the fluke's natural range in Europe and western Asia. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Galba humilis, a host of F. hepatica in Canada and parts of the United States. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Fossaria bulamoides, a host for F. hepatica in the western United States. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Pseudosuccinea columella, a lymnaeid snail that has been introduced into South America and serves as an intermediate host for F. hepatica in Venezuela and Colombia. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC

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• Fasciolopsiasis Return to Top

---

• Fasciolopsis buski Return to Top

Fasciolopsis buski eggs

• 
  Egg of F. buski in a unstained wet mount.
  Adapted from CDC
• 
  Egg of F. buski in a unstained wet mount.
  Adapted from CDC
• 
  Egg of F. buski in unstained wet mounts.
  Adapted from CDC
• 
  Egg of F. buski in an unstained wet mount of stool.
  Adapted from CDC
• 
  Higher magnification (400x) of the egg in Figure 4.
  Adapted from CDC

Fasciolopsis buski adults

• 
  Adult fluke of F. buski. Image contributed by Georgia Division of Public Health.
  Adapted from CDC
• 
  Adult fluke of F. buski.
  Adapted from CDC

Intermediate hosts of F. buski

• 
  Snail in the genus Hippeutis, an intermediate host for F. buski. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Snail in the genus Segmentina, an intermediate host for F. buski. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC

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• Fleas Return to Top

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• Ctenocephalides canis Return to Top

• 
  The dog flea, C. canid. Image courtesy of Parasite and Diseases Image Library, Australia (http://www.padil.gov.au/).
  Adapted from CDC

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• Ctenocephalides felis Return to Top

• 
  The cat flea, C. felis. Image courtesy of Parasite and Diseases Image Library, Australia (http://www.padil.gov.au/).
  Adapted from CDC
• 
  The cat flea, C. felis. Image courtesy of Parasite and Diseases Image Library, Australia (http://www.padil.gov.au/).
  Adapted from CDC

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• Free-living amebic infections Return to Top

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• Acanthamoeba Return to Top

Acanthamoeba spp. cysts

• 
  Cysts of Acanthamoeba spp. in culture.
  Adapted from CDC
• 
  Cysts of Acanthamoeba spp. in culture.
  Adapted from CDC
• 
  Cyst of Acanthamoeba sp. from brain tissue, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Cyst of Acanthamoeba sp. from brain tissue, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Cysts of Acanthamoeba sp. (green arrows) in tissue, stained with H&E.
  Adapted from CDC

Acanthamoeba spp. trophozoites

• 
  Trophozoite of Acanthamoeba sp. from culture. Notice the slender, spine-like acanthapodia.
  Adapted from CDC
• 
  Trophozoites of Acanthamoeba sp. from culture. Notice the slender, spine-like acanthapodia.
  Adapted from CDC
• 
  Trophozoite of Acanthamoeba sp. in tissue, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Trophozoites of Acanthamoeba sp. in a corneal scraping, stained with H&E.
  Adapted from CDC

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• Balamuthia mandrillaris Return to Top

Balamuthia mandrillaris cysts

• 
  Cysts of B. mandrillaris.
  Adapted from CDC
• 
  Close-up of one of the cysts in Figure 1.
  Adapted from CDC
• 
  Cyst of B. mandrillaris.
  Adapted from CDC
• 
  Cyst of B. mandrillaris in brain tissue, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Cyst of B. mandrillaris in brain tissue, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Cyst of B. mandrillaris in brain tissue, stained with H&E. Image courtesy of the University of Kentucky Hospital, Lexington, Kentucky.
  Adapted from CDC
• 
  Cyst of B. mandrillaris in brain tissue, stained with H&E. Image courtesy of the University of Kentucky Hospital, Lexington, Kentucky.
  Adapted from CDC
• 
  Cysts of B. mandrillaris in brain tissue, stained with H&E. Image courtesy of Cook Children’s Hospital, Fort Worth, Texas.
  Adapted from CDC
• 
  Cyst of B. mandrillaris in brain tissue, stained with H&E. Image courtesy of Cook Children’s Hospital, Fort Worth, Texas.
  Adapted from CDC

Balamuthia mandrillaris trophozoites

• 
  Trophozoite of B. mandrillaris in culture.
  Adapted from CDC
• 
  Trophozoite of B. mandrillaris in culture.
  Adapted from CDC
• 
  Trophozoite of B. mandrillaris in culture.
  Adapted from CDC
• 
  Trophozoite of B. mandrillaris in culture.
  Adapted from CDC
• 
  Several trophozoites of B. mandrillaris in brain tissue, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  A single trophozoite (green arrow) of B. mandrillaris in brain tissue, stained with H&E.
  Adapted from CDC
• 
  A single trophozoite (black arrow) of B. mandrillaris in brain tissue, stained with H&E.
  Adapted from CDC

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• Naegleria fowleri Return to Top

Naegleria fowleri cysts

• 
  Cyst of N. fowleri in culture.
  Adapted from CDC

Naegleria fowleri trophozoites

• 
  Trophozoite of N. fowleri in culture.
  Adapted from CDC
• 
  Trophozoites of N. fowleri in culture.
  Adapted from CDC
• 
  Ameboflagellate trophozoite of N. fowleri.
  Adapted from CDC
• 
  Trophozoite of N. fowleri in CSF, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Trophozoite of N. fowleri in CSF, stained with trichrome. Image courtesy of the Texas State Health Department.
  Adapted from CDC

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• Sappinia pedata Return to Top

• 
  Four trophozoites (yellow arrows) of S. pedata in brain tissue, stained with hematoxylin and eosin (H&E). In three of the amebae, the two nuclei can easily be seen.
  Adapted from CDC

G

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• Giardiasis Return to Top

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• Giardia duodenalis (syn. G. lamblia, G. intestinalis) Return to Top

Giardia duodenalis cysts in wet mounts stained with iodine

• 
  G. duodenalis cyst in a wet mount stained with iodine.
  Adapted from CDC
• 
  G. duodenalis cyst in a wet mount stained with iodine.
  Adapted from CDC
• 
  G. duodenalis cyst in a wet mount stained with iodine.
  Adapted from CDC
• 
  G. duodenalis cyst in a wet mount stained with iodine.
  Adapted from CDC
• 
  G. duodenalis cyst in a wet mount stained with iodine.
  Adapted from CDC
• 
  G. duodenalis cyst in a wet mount stained with iodine.
  Adapted from CDC

Giardia duodenalis cysts in wet mounts under differential interference contrast (DIC) microscopy

• 
  G. duodenalis cyst in a wet mount under differential interference contrast (DIC) microscopy. Image taken at 1000× magnification.
  Adapted from CDC
• 
  Two G. duodenalis cysts in a wet mount under DIC microscopy; image taken at 1000× magnification.
  Adapted from CDC

G. duodenalis cysts in trichrome stain

• 
  G. duodenalis cyst stained with trichrome.
  Adapted from CDC
• 
  G. duodenalis cyst stained with trichrome.
  Adapted from CDC
• 
  G. duodenalis cyst stained with trichrome.
  Adapted from CDC
• 
  G. duodenalis cyst stained with trichrome.
  Adapted from CDC
• 
  G. duodenalis cyst stained with trichrome.
  Adapted from CDC
• 
  G. duodenalis cyst stained with trichrome.
  Adapted from CDC
• 
  G. duodenalis cyst stained with trichrome. Sometimes the cytoplasm of the cyst may retract from the cell wall.
  Adapted from CDC
• 
  G. duodenalis cyst stained with trichrome. Sometimes the cytoplasm of the cyst may retract from the cell wall.
  Adapted from CDC
• 
  G. duodenalis cyst stained with trichrome. Sometimes the cytoplasm of the cyst may retract from the cell wall.
  Adapted from CDC
• 
  G. duodenalis cyst stained with trichrome. Sometimes the cytoplasm of the cyst may retract from the cell wall.
  Adapted from CDC

G. duodenalis trophozoites in wet mounts

• 
  G. duodenalis trophozoite in a wet mount stained with iodine.
  Adapted from CDC
• 
  G. duodenalis trophozoite in a wet mount under differential interference contrast (DIC) microscopy. Image taken at 1000× magnification.
  Adapted from CDC

G. duodenalis trophozoites stained with trichrome

• 
  G. duodenalis trophozoite stained with trichrome.
  Adapted from CDC
• 
  G. duodenalis trophozoite stained with trichrome.
  Adapted from CDC
• 
  G. duodenalis trophozoite stained with trichrome.
  Adapted from CDC
• 
  G. duodenalis trophozoites. Image contributed by the Vermont Department of Health Laboratory.
  Adapted from CDC

G. duodenalis trophozoites in unique stains

• 
  G. duodenalis trophozoites in Kohn stain.
  Adapted from CDC
• 
  G. duodenalis trophozoites in a Giemsa stained mucosal imprint.
  Adapted from CDC

Cysts of Giardia duodenalis and oocysts of Cryptosporidium parvum

• 
  Cysts of G. duodenalis (lower right) and oocysts of Cryptosporidium parvum (upper left) labeled with commercially available immunofluorescent antibodies.
  Adapted from CDC

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• Gnathostomiasis Return to Top

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• Gnathostoma hispidum Return to Top

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• Gnathostoma spinigerum Return to Top

Head bulb and cuticular spines of Gnathostoma spinigerum

• 
  Head bulb.
  Adapted from CDC
• 
  Cuticular spines of the posterior body part.
  Adapted from CDC

Detail of cuticular spines of the anterior body part of G. spinigerum

• 
  Detail of cuticular spines of the anterior body part.
  Adapted from CDC

Detail of nondendiculated cuticular spines of G. spinigerum

• 
  Detail of nondendiculated cuticular spines.
  Adapted from CDC
• 
  Detail of nondendiculated cuticular spines.
  Adapted from CDC

H

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• Hepatic capillariasis Return to Top

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• Capillaria hepatica Return to Top

Capillaria hepatica eggs

• 
  Eggs of C. hepatica in liver stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Eggs of C. hepatica in liver stained with hematoxylin and eosin (H&E). The egg in this figure (1000x magnification) shows the typically striated shell and shallow polar prominences.
  Adapted from CDC
• 
  Eggs of C. hepatica in liver stained with H&E.
  Adapted from CDC
• 
  Eggs of C. hepatica in liver stained with H&E.
  Adapted from CDC

Capillaria hepatica adults

• 
  Cross section of a male C. hepatica in liver tissue, stained with hematoxylin and eosin (H&E). Note the presence of the intestine (blue arrow) and the coiled sections of the testes (black arrows).
  Adapted from CDC
• 
  Cross section of C. hepatica in liver tissue, stained with H&E. Note the presence of the intestine (blue arrow) and bacillary bands (black arrows).
  Adapted from CDC
• 
  Cross-section of C. hepatica in liver tissue, stained with H&E. Note the presence of a stichocyte (black arrow) and bacillary bands (blue arrows). Image taken at 200x magnification.
  Adapted from CDC

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• Heterophyiasis Return to Top

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• Heterophyes heterophyes Return to Top

Adult of Heterophyes heterophyes

• 
  Adult of H. heterophyes, stained with carmine. In this figure, the following structures are labeled: oral sucker (OS), pharynx (PH), intestine (IN), ventral sucker, or acetabulum (AC), and eggs within the uterus (UT)
  Adapted from CDC

Snail intermediate hosts of Heterophyes heterophyes

• 
  Cerithideopsilla cingulata, an intermediate host for H. heterophyes in southeast Asia. Image courtesy of Conchology, Inc, Mactan Island, Philippines
  Adapted from CDC

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• Hymenolepiasis Return to Top

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• Hymenolepis diminuta Return to Top

Hymenolepis diminuta eggs in wet mounts

• 
  Egg of H. diminuta in a wet mount stained with iodine. Four of the hooks are visible at this level of focus. Image courtesy of the Georgia Department of Public Health.
  Adapted from CDC
• 
  Egg of H. diminuta in a wet mount stained with iodine. Four of the hooks are visible at this level of focus.
  Adapted from CDC
• 
  Eggs of H. diminuta in an unstained wet mount of concentrated stool. Image taken at 200x magnification.
  Adapted from CDC
• 
  Higher magnification (400x) of one of the eggs in Figure 3.
  Adapted from CDC
• 
  Egg of H. diminuta in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
  Adapted from CDC
• 
  Egg of H. diminuta in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
  Adapted from CDC

Hymenolepis diminuta proglottids

• 
  Proglottids of H. diminuta stained with carmine. Notice the craspedote form of the proglottids.
  Adapted from CDC

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• Hymenolepis nana Return to Top

Hymenolepis nana eggs in wet mounts

• 
  Egg of H. nana in an unstained wet mount. Note the presence of hooks in the oncosphere and polar filaments within the space between the oncosphere and outer shell.
  Adapted from CDC
• 
  Egg of H. nana in an unstained wet mount. Note the presence of hooks in the oncosphere and polar filaments within the space between the oncosphere and outer shell.
  Adapted from CDC
• 
  Egg of H. nana in an unstained wet mount.
  Adapted from CDC
• 
  Egg of H. nana in an unstained formalin ethyl acetate (FEA) wet mount. In this image, four of the hooks in the oncosphere are clearly visible. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
• 
  Egg of H. nana in an unstained wet mount. In this image, the polar filaments in the space between the oncosphere and outer shell are clearly visible.
  Adapted from CDC
• 
  Egg of H. nana in an unstained wet mount. In this image, the polar filaments in the space between the oncosphere and outer shell are clearly visible.
  Adapted from CDC

Hymenolepis nana eggs, zinc PVA trichrome stain

• 
  Egg of H. nana in a trichrome-stained stool specimen. Although trichrome is not the preferred method for observing helminth eggs, they can be detected this way. The eggs are distorted, probably due to the zinc polyvinyl alcohol (PVA) used for preserving specimens for trichrome stain. Images courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
• 
  Egg of H. nana in a trichrome-stained stool specimen. Although trichrome is not the preferred method for observing helminth eggs, they can be detected this way. The eggs are distorted, probably due to the zinc polyvinyl alcohol (PVA) used for preserving specimens for trichrome stain. Images courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC

Hymenolepis nana proglottids

• 
  Cross-sections of mature proglottids of H. nana stained with hematoxylin and eosin (H&E), taken at 100x. Note the craspedote (overlapping) proglottids.
  Adapted from CDC
• 
  Higher magnification of eggs within the proglottid in Figure 1, taken at 400x.
  Adapted from CDC
• 
  Higher magnification of the eggs in Figures 1 and 2, taken at 1000x, oil. Hooks do not stain with H&E but are refractile and may be visible in stained specimens with proper adjustment of the microscope. Polar filaments are visible in the egg in the upper right quadrant of the image.
  Adapted from CDC

Hymenolepis nana adults

• 
  Three adult specimens of H. nana. Image courtesy of the Georgia Department of Public Health.
  Adapted from CDC
• 
  Scolex of H. nana in an unstained wet mount of stool. Image courtesy of Dr. David Bruckner.
  Adapted from CDC
• 
  Higher magnification of the scolex in Figure 2. In this image, two of the suckers and the rostellar hooks are clearly visible.
  Adapted from CDC

I

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• Intestinal amebae Return to Top

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• Entamoeba coli Return to Top

E. coli cysts in concentrated wet mounts

• 
  Cyst of E. coli in a unstained concentrated wet mount. Six nuclei are visible in this focal plane.
  Adapted from CDC
• 
  Cyst of E. coli in a concentrated wet mount stained with iodine. Five nuclei are visible in this focal plane.
  Adapted from CDC
• 
  Cyst of E. coli in a concentrated wet mount stained with iodine. Seven nuclei are visible in this focal plane.
  Adapted from CDC
• 
  Cyst of E. coli in a concentrated wet mount stained with iodine. Five nuclei are visible in this focal plane.
  Adapted from CDC
• 
  Cyst of E. coli in a concentrated wet mount stained with iodine. Five nuclei are visible in this focal plane.
  Adapted from CDC

E. coli cysts stained with trichrome

• 
  Immature cyst of E. coli, stained with trichrome. Notice the presence of only two nuclei, and a large glycogen vacuole.
  Adapted from CDC
• 
  Mature cyst of E. coli, stained with trichrome. Five nuclei are visible in this focal plane.
  Adapted from CDC
• 
  Mature cyst of E. coli, stained with trichrome. In this specimen, at least five nuclei are visible in the shown focal plane.
  Adapted from CDC
• 
  Mature cyst of E. coli, stained with trichrome. In this specimen, at least five nuclei are visible in the shown focal plane.
  Adapted from CDC
• 
  Mature cyst of E. coli, stained with trichrome. This figure and Figure 6 represent the same cyst shown in two different focal planes. Eight nuclei can be seen between the two focal planes. Also, above the cyst in this figure, a trophozoite of Endolimax nana can be seen.
  Adapted from CDC
• 
  Mature cyst of E. coli, stained with trichrome. This figure and Figure 5 represent the same cyst shown in two different focal planes. Eight nuclei can be seen between the two focal planes.
  Adapted from CDC

E. coli trophozoites stained with trichrome

• 
  Trophozoite of E. coli stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. coli stained with trichrome.
  Adapted from CDC
• 
  Trophozoites of E. coli stained with trichrome.
  Adapted from CDC

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• Entamoeba gingivalis Return to Top

E. gingivalis trophozoites stained with trichrome

• 
  Trophozoite of E. gingivalis from culture, stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. gingivalis from culture, stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. gingivalis from culture, stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. gingivalis from culture, stained with trichrome.
  Adapted from CDC

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• Entamoeba hartmanni Return to Top

E. hartmanni cyst in a wet mount

• 
  Cyst of an E. hartmanni in a wet mount, stained with iodine.
  Adapted from CDC

E. hartmanni cysts stained with trichrome

• 
  Cyst of E. hartmanni stained with trichrome. Notice the bluntly-ended chromatoid bodies.
  Adapted from CDC
• 
  Cyst of E. hartmanni stained with trichrome.
  Adapted from CDC

E. hartmanni trophozoites stained with trichrome

• 
  Trophozoite of E. hartmanni stained with trichrome. Image courtesy of the Kansas Department of Health and Environment.
  Adapted from CDC
• 
  Trophozoite of E. hartmanni stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. hartmanni stained with trichrome. In the upper-right of the image is a cyst-like body of Blastocystis hominis.
  Adapted from CDC
• 
  Trophozoite of E. hartmanni stained with trichrome.
  Adapted from CDC
• Two trophozoites of E. hartmanni stained with trichrome. Adapted from CDC
  Two trophozoites of E. hartmanni stained with trichrome.
  Adapted from CDC
• Trophozoite of E. hartmanni stained with trichrome. Adapted from CDC
  Trophozoite of E. hartmanni stained with trichrome.
  Adapted from CDC

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• Entamoeba histolytica Return to Top

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• Entamoeba polecki Return to Top

E. polecki cyst in a concentrated wet mount, stained with iodine

• 
  Cyst of E. polecki in a wet mount, stained with iodine. Notice the numerous chromatoid bodies (arrows).
  Adapted from CDC

E. polecki cysts stained with trichrome

• 
  Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
  Adapted from CDC
• 
  Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
  Adapted from CDC
• 
  Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
  Adapted from CDC
• 
  Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
  Adapted from CDC
• 
  Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
  Adapted from CDC
• 
  Cyst of E. polecki stained with trichrome. Notice the large nucleus with a pleomorphic karyosome and numerous variably-shaped chromatoid bodies.
  Adapted from CDC

E. polecki trophozoites stained with trichrome

• 
  Trophozoite of E. polecki stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. polecki stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. polecki stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. polecki stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. polecki stained with trichrome.
  Adapted from CDC

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• Endolimax nana Return to Top

Endolimax nana cysts in concentrated wet mounts

• 
  Cyst of E. nana in a direct wet mount, viewed under differential interference contrast (DIC) microscopy.
  Adapted from CDC
• 
  Cyst of E. nana in a direct wet mount stained with iodine.
  Adapted from CDC

E. nana cyst stained with trichrome

• 
  Cysts of E. nana stained with trichrome.
  Adapted from CDC
• 
  Cyst of E. nana stained with trichrome.
  Adapted from CDC
• 
  Cyst of E. nana stained with trichrome.
  Adapted from CDC
• 
  Cyst of E. nana stained with trichrome.
  Adapted from CDC

E. nana trophozoites stained with trichrome

• 
  Trophozoite of E. nana stained with trichrome.
  Adapted from CDC
• 
  Trophozoites of E. nana stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. nana stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of E. nana stained with trichrome. Image courtesy of the Kansas Department of Health and Environment.
  Adapted from CDC
• 
  Trophozoite of E. nana stained with trichrome.
  Adapted from CDC

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• Iodamoeba buetschlii Return to Top

Iodamoeba buetschlii cysts in concentrated wet mounts

• 
  Cyst of I. buetschlii in an unstained concentrated wet mount. In these cysts, the glycogen vacuole can be seen as a large, oval refractile body.
  Adapted from CDC
• 
  Cyst of I. buetschlii in an unstained concentrated wet mount. In these cysts, the glycogen vacuole can be seen as a large, oval refractile body.
  Adapted from CDC
• 
  Cyst of I. buetschlii from the same specimen as seen in Figures A and B, but stained with iodine. In this cyst, the glycogen vacuole is more-easily observed as a dark-staining mass in the cyst.
  Adapted from CDC
• 
  Cyst of I. buetschlii from the same specimen as seen in Figures A and B, but stained with iodine. In this cyst, the glycogen vacuole is more-easily observed as a dark-staining mass in the cyst.
  Adapted from CDC

I. buetschlii cysts stained with trichrome

• 
  Cyst of I. buetschlii stained with trichrome. In this specimen, both the nucleus and large glycogen vacuole are visible.
  Adapted from CDC
• 
  Cyst of I. buetschlii stained with trichrome. In this specimen, both the nucleus and large glycogen vacuole are visible.
  Adapted from CDC
• 
  Cyst of I. buetschlii stained with trichrome. In this specimen, both the nucleus and large glycogen vacuole are visible (arrow).
  Adapted from CDC
• 
  Cyst of I. buetschlii stained with trichrome. In this specimen, both the nucleus and large glycogen vacuole are visible.
  Adapted from CDC

I. buetschlii trophozoite stained with trichrome

• 
  Trophozoite of I. buetschlii trophozoite stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of I. buetschlii trophozoite stained with trichrome.
  Adapted from CDC

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• Intestinal capillariasis Return to Top

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• Capillaria philippinensis Return to Top

Capillaria philippinensis eggs

• 
  Egg of C. philippinensis in an unstained wet mount of stool.
  Adapted from CDC
• 
  Egg of C. philippinensis in an unstained wet mount of stool.
  Adapted from CDC
• 
  Egg of C. philippinensis in an unstained wet mount of stool.
  Adapted from CDC
• 
  Egg of C. philippinensis in an unstained wet mount of stool.
  Adapted from CDC

Capillaria philippinensis adults

• 
  Longitudinal section of an adult of C. philippinensis from an intestinal biopsy specimen stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Longitudinal section of an adult of C. philippinensis from an intestinal biopsy specimen stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Longitudinal section of an adult C. philippinensis from an intestinal biopsy specimen, stained with H&E.
  Adapted from CDC
• 
  Higher magnification of Figure 3, showing stichocytes within the adult worm.
  Adapted from CDC
• 
  Cross-section of a gravid adult female C. philippinensis from an intestinal biopsy specimen, stained with H&E. Shown in this figure are a bacillary band (blue arrow), the intestine (red arrow) and uterus containing an egg in cross-section (black arrow).
  Adapted from CDC

L

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• Leishmaniasis (Visceral leishmaniasis, Kala-azar) Return to Top

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• Leishmania sp. Return to Top

Leishmania amastigotes

• 
  Leishmania sp. amastigotes in a Giemsa-stained tissue scraping.
  Adapted from CDC
• 
  Leishmania (Viannia) panamensis amastigotes in a Giemsa-stained tissue scraping. Identification to the species level is not possible based on morphology and other diagnostic techniques such isoenzyme assay or PCR are needed.
  Adapted from CDC
• 
  Leishmania (Viannia) panamensis amastigotes in a Giemsa-stained tissue scraping.
  Adapted from CDC
• 
  Leishmania (Viannia) panamensis amastigotes in a Giemsa-stained tissue scraping.
  Adapted from CDC
• 
  Leishmania sp. amastigotes; touch-prep stained with Giemsa.
  Adapted from CDC
• 
  Leishmania sp. amastigotes; touch-prep stained with Giemsa.
  Adapted from CDC
• 
  Leishmania tropica amastigotes from an impression smear of a biopsy specimen from a skin lesion. In this figure, an intact macrophage is practically filled with amastigotes (arrows), several of which have a clearly visible nucleus and kinetoplast.
  Adapted from CDC
• 
  Leishmania tropica amastigotes from an impression smear of a biopsy specimen from a skin lesion. In this figure, amastigotes are being freed from a rupturing macrophage. Patient had traveled to Egypt, Africa, and the Middle East. Based on culture in NNN medium, followed by isoenzyme analysis, the species was identified as L. tropica.
  Adapted from CDC

Leishmania mexicana in tissue stained with hematoxylin and eosin (H&E)

• 
  Amastigotes of Leishmania sp. in a biopsy specimen from a skin lesion, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Leishmania mexicana in a biopsy specimen from a skin lesion stained with H&E. The amastigotes are lining the walls of two vacuoles, a typical arrangement. The species identification was derived from culture followed by isoenzyme analysis.
  Adapted from CDC

Leishmania sp. promastigotes from culture

• 
  Leishmania sp. promastigotes from culture.
  Adapted from CDC

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• Loaiasis Return to Top

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• Loa loa Return to Top

Microfilariae of Loa loa

• 
  Microfilaria of L. loa a thick blood smear from a patient from Cameroon, stained with Giemsa. Note the nuclei extending to the tip of the tail to the left of the image.
  Adapted from CDC
• 
  Microfilaria of L. loa in a thick blood smear, stained with Giemsa.
  Adapted from CDC
• 
  Microfilaria of L. loa in a thick blood smear, stained with Giemsa.
  Adapted from CDC
• 
  Microfilaria of L. loa in a thin blood smear, stained with Giemsa.
  Adapted from CDC
• 
  Microfilaria of L. loa in a thin blood smear, stained with Giemsa.
  Adapted from CDC
• 
  Microfilaria of L. loa in a thin blood smear, stained with Giemsa.
  Adapted from CDC
• 
  Microfilariae of L. loa captured by the Knotts concentration technique. Image taken at 100x magnification.
  Adapted from CDC
• 
  Higher magnification of the microfilariae in Figure 7, taken at 500x oil magnification.
  Adapted from CDC

Adults of L. loa

• 
  Adult of L. loa removed from the eye of a patient. Image courtesy of the Georgia State Public Health Laboratory.
  Adapted from CDC
• 
  Adult of L. loa removed from the eye of a patient. Image courtesy of the Georgia State Public Health Laboratory.
  Adapted from CDC

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• Lymphatic filariasis (Bancroftian filariasis) Return to Top

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• Brugia malayi Return to Top

• 
  Microfilaria of B. malayi in a thick blood smear, stained with Giemsa.
  Adapted from CDC
• 
  Microfilaria of B. malayi in a thin blood smear, stained with Giemsa.
  Adapted from CDC

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• Brugia timori Return to Top

• 
  Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
  Adapted from CDC
• 
  Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
  Adapted from CDC
• 
  Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
  Adapted from CDC
• 
  Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
  Adapted from CDC
• 
  Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
  Adapted from CDC
• 
  Microfilaria of B. timori in a thick blood smear from a patient from Indonesia, stained with Giemsa and captured at 500x oil magnification. Image from a specimen courtesy of Dr. Thomas C. Orihel, Tulane University, New Orleans, LA.
  Adapted from CDC

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• Wuchereria bancrofti Return to Top

Microfilariae of Wuchereria bancrofti

• 
  Microfilaria of W. bancrofti in a thick blood smear stained with Giemsa. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
• 
  Microfilaria of W. bancrofti in a thick blood smear stained with Giemsa. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
• 
  Microfilaria of W. bancrofti in a thick blood smear, stained with Giemsa.
  Adapted from CDC
• 
  Close-up of the anterior end of the worm in Figure 3.
  Adapted from CDC
• 
  Close-up of the posterior end of the worm in Figure 3.
  Adapted from CDC

Adults of W. bancrofti

• 
  Adults of W. bancrofti. The male worm is on the left; the female is on the right.
  Adapted from CDC

M

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• Malaria Return to Top

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• Plasmodium falciparum Return to Top

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• Plasmodium knowlesi Return to Top

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• Plasmodium malariae Return to Top

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• Plasmodium ovale Return to Top

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• Plasmodium vivax Return to Top

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• Mansonellosis Return to Top

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• Mansonella ozzardi Return to Top

Microfilariae of Mansonella ozzardi

• 
  Microfilaria of M. ozzardi in a thick blood smear, stained with Giemsa.
  Adapted from CDC
• 
  Microfilaria of M. ozzardi in a thick blood smear, stained with Giemsa.
  Adapted from CDC
• 
  Microfilaria of M. ozzardi in a thick blood smears, stained with Giemsa.
  Adapted from CDC
• 
  Microfilaria of M. ozzardi in a thick blood smear, stained with Giemsa. Note the hook-like end to the tail in this figure.
  Adapted from CDC

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• Mansonella perstans Return to Top

Microfilariae of Mansonella perstans

• 
  Microfilaria of M. perstans in a thick blood smear stained with Giemsa, from a patient from Cameroon.
  Adapted from CDC
• 
  Microfilaria of M. perstans in a thick blood smear stained with Giemsa, from a patient from Cameroon.
  Adapted from CDC
• 
  Microfilaria of M. perstans in a thick blood smear stained with Giemsa, from a patient from Cameroon.
  Adapted from CDC
• 
  Microfilaria of M. perstans in a thin blood smear from the same specimen as Figures 1-3.
  Adapted from CDC
• 
  Microfilaria of M. perstans in a thin blood smear from the same specimen as Figures 1-4.
  Adapted from CDC
• 
  Microfilaria of M. perstans in a thick blood smear stained with Giemsa. Image courtesy of the Parasitology Department, Public Health Lab, Ontario Agency for Health Protection and Promotion, Canada.
  Adapted from CDC

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• Mansonella streptocerca Return to Top

Microfilariae of Mansonella streptocerca

• 
  Microfilaria of M. streptocerca, fixed in 2% formalin and stained with hematoxylin.
  Adapted from CDC

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• Mesocestoidiasis Return to Top

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• Mesocestoides spp. Return to Top

Mesocestoides spp. proglottids and scoleces

• 
  Proglottids of Mesocestoides sp., collected from the stool of a dog.
  Adapted from CDC
• 
  Higher magnification of the proglottids in Figure 1, showing the uterus (red arrow), ovary (blue arrow) and parauterine organ (green arrow).
  Adapted from CDC
• 
  Gravid proglottid of Mesocestoides sp. stained with carmine. Shown in this specimen are the uterus (UT) and excretory ducts (ED).
  Adapted from CDC
• 
  Mature proglottids of Mesocestoides sp. stained with carmine. Shown in this specimen are the vagina (VA), cirrus sac (CS), bilobed ovary (OV) and numerous testes (TE).
  Adapted from CDC
• 
  Scolex of Mesocestoides sp. stained with carmine. In this field, two of the suckers are clearly visible. Note that lack of rostellar hooklets.
  Adapted from CDC

Mesocestoides spp. tetrathyridia

• 
  Tetrathyridium of Mesocestoides sp. in the liver of a laboratory-infected mouse.
  Adapted from CDC

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• Metagonimiasis Return to Top

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• Metagonimus yokogawai Return to Top

Metagonimus yokogawai, adult fluke

• 
  Adult M. yokogawai, stained with carmine. In this figure, the following structures are labeled: oral sucker (OS), pharynx (PH), intestine (IN), genitoacetabulum (GA), ovary (OV), the large, paired testes (TE), and eggs within the uterus (EG).
  Adapted from CDC

Snail intermediate hosts of M. yokogawai

• 
  Snail in the genus, Semisulcospira. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Snail in the genus, Semisulcospira. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC

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• Microsporidiosis Return to Top

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• Encephalitozoon cuniculi Return to Top

• 
  Encephalitozoon cuniculi spores stained with Gram Chromotrope.
  Adapted from CDC
• 
  Encephalitozoon cuniculi spores stained with Gram Chromotrope.
  Adapted from CDC
• 
  Encephalitozoon cuniculi spores stained with Gram Chromotrope.
  Adapted from CDC
• 
  Spores of E. cuniculi from urine stained with Ryan's modified trichrome (Trichrome blue).
  Adapted from CDC
• 
  Spores of E. cuniculi from urine stained with Ryan's modified trichrome (Trichrome blue).
  Adapted from CDC
• 
  Spores of E. cuniculi from urine stained with Ryan's modified trichrome.
  Adapted from CDC
• 
  Spores of E. cuniculi in a kidney biopsy specimen stained with Ryan's modified trichrome.
  Adapted from CDC

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• Encephalitozoon hellem Return to Top

• 
  Scanning electron micrograph showing an eukaryotic cell bursting and releasing spores of Encephalitozoon hellem to the extracellular medium.
  Adapted from CDC
• 
  Monoclonal antibody-based immunofluorescence identification of Encephalitozoon hellem.
  Adapted from CDC

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• Encephalitozoon intestinalis Return to Top

• 
  Electron micrograph of an eukaryotic cell with Encephalitozoon intestinalis spores and developing forms inside a septated parasitophorous vacuole. The vacuole is a characteristic feature of this microsporidian species.
  Adapted from CDC
• 
  Transmission electron micrograph of E. intestinalis depicting developing forms inside a parasitophorous vacuole (red arrows) with mature spores (black arrows).
  Adapted from CDC
• 
  Encephalitozoon intestinalis stained with Calcofluor white.
  Adapted from CDC

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• Enterocytozoon bieneusi Return to Top

• 
  Electron micrograph of an Enterocytozoon bieneusi spore. Arrows indicate the double rows of polar tubule coils in cross section which characterize a mature E. bieneusi spore.
  Adapted from CDC
• 
  Enterocytozoon bieneusi spores stained with Chromotrope 2R.
  Adapted from CDC

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• Nosema spp. Return to Top

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• Pleistophora sp. Return to Top

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• Trachipleistophora spp. Return to Top

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• Vittaforma corneae Return to Top

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• Myiasis (Bot Flies) Return to Top

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• Cuterebra spp. Return to Top

• 
  Anterior end of a larva of a bot fly in the genus, Cuterebra.
  Adapted from CDC
• 
  Posterior end of the larva in Figure 1.
  Adapted from CDC
• 
  Adult of Cuterebra sp. Cuterebra spp. are primarily parasites of rodents and lagomorphs, although human infections are rare. Images taken from specimens courtesy of the Georgia Museum of Natural History, University of Georgia, Athens, GA.
  Adapted from CDC
• 
  Adult of Cuterebra sp. Cuterebra spp. are primarily parasites of rodents and lagomorphs, although human infections are rare. Images taken from specimens courtesy of the Georgia Museum of Natural History, University of Georgia, Athens, GA.
  Adapted from CDC

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• Dermatobia hominis Return to Top

• 
  Four larvae of D. hominis, removed from a human host.
  Adapted from CDC
• 
  Close-up of the anterior end of one of the larvae from Figure 1, showing the mandibles.
  Adapted from CDC
• 
  Close-up of the posterior end of one of the larvae from Figure 1.
  Adapted from CDC
• 
  Anterior end of a larva of D. hominis. Image from a specimen courtesy of the Idaho State Health Department.
  Adapted from CDC
• 
  Adult of Dermatobia hominis, the human bot fly. Image taken from a specimen courtesy of the Georgia Museum of Natural History, University of Georgia, Athens, GA.
  Adapted from CDC

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• Oestrus ovis Return to Top

• 
  First instar larva of Oestrus ovis, taken from the conjunctiva of patient in New Zealand. Image courtesy of Auckland City Hospital, Auckland, New Zealand.
  Adapted from CDC
• 
  Close-up of the anterior end of the larva in Figure 1, showing the cephalopharyngeal skeleton and mandibles.
  Adapted from CDC
• 
  Close-up of the posterior end of the larva in Figure 1.
  Adapted from CDC
• 
  First instar larva of O. ovis, collected from the eye of a patient in India presenting with conjunctivitis. Image courtesy of the L V Prasad Eye Institute, Banjara Hills, India.
  Adapted from CDC

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• Phormia regina Return to Top

• 
  Third instar larva of P. regina, collected in the wound of a patient.
  Adapted from CDC
• 
  Close-up of the posterior spiracles of the specimen in Figure 1.
  Adapted from CDC

O

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• Oesophagostomiasis Return to Top

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• Oesophagostomum spp. Return to Top

Eggs of Oesophagostomum spp.

• 
  Egg of Oesophagostomum sp. in an unstained wet mount of stool.
  Adapted from CDC
• 
  Egg of Oesophagostomum sp. in an unstained wet mount of stool.
  Adapted from CDC

L3 infective larvae of Oesophagostomum spp.

• 
  L3 larva of Oesophagostomum sp., obtained via coproculture from the feces of a baboon (Papio ursinus) in South Africa. Note the long, thin, pointed tail. Image courtesy of the UTC Baboon Research Unit, University of Cape Town, South Africa.
  Adapted from CDC
• 
  Higher-magnification of the anterior end of the specimen in Figure 1. Note the long cephalic space.
  Adapted from CDC
• 
  Mid-section of the specimen in Figures 1 and 2. Notice the alternating triangular-shaped intestinal cells (IN).
  Adapted from CDC
• 
  Tail-end of the specimen in Figures 1-3. Notice the long tail space (arrow) and long, tapering tail sheath.
  Adapted from CDC

Adults of Oesophagostomum spp.

• 
  Adult of Oesophagostomum sp.
  Adapted from CDC
• 
  Higher magnification of the anterior end of the specimen in Figure 1. Note the presence of the cephalic vesicle (CV), cephalic groove (CG) and esophagus (ES).
  Adapted from CDC
• 
  Higher magnification of the anterior end of the specimen in Figures 1 and 2. Note the presence of the cephalic vesicle (CV) and corona radiata (CR).
  Adapted from CDC
• 
  Posterior end of a female Oesophagostomum sp., showing the pointed tail.
  Adapted from CDC
• 
  Posterior end of male Oesophagostomum sp. Note the spicule (SP).
  Adapted from CDC
• 
  Same specimen as in Figure 5, but shown in a slightly different focal plane. Note the bursa (BU).
  Adapted from CDC

Oesophagostomum spp. in tissue specimens

• 
  Cross-section of an adult of Oesophagostomum sp. in a colon biopsy specimen from a patient from Africa, stained with H&E. Image taken at 40x magnification.
  Adapted from CDC
• 
  Higher magnification (200x) of the specimen in Figure 1. Note the large, platymyarian muscle cells (MU), intestine with brush border (IN), and paired reproductive tubes (RT).
  Adapted from CDC
• 
  Higher-magnification (200x) of the specimen in Figure 1. Note the large, platymyarian muscle cells (MU) and thick, muscled esophagus (ES).
  Adapted from CDC

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• Onchocerciasis (River Blindness) Return to Top

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• Onchocerca volvulus Return to Top

Microfilariae of Onchocerca volvulus in tissue

• 
  Microfilariae of O. volvulus from a skin nodule of a patient from Zambia, stained with hematoxylin and eosin (H&E). Image taken at 1000x oil magnification. Microfilariae of O. volvulus within the uterus of an adult female. The specimen was taken from the same patient as in Figure 1. Image taken at 500x magnification, oil.
  Adapted from CDC
• 
  Microfilariae of O. volvulus within the uterus of an adult female. The specimen was taken from the same patient as in Figure A. Image taken at 500x magnification, oil.
  Adapted from CDC
• 
  Microfilariae of O. volvulus from a skin nodule of a patient from Zambia, stained with H&E. Image taken at 1000x oil magnification.
  Adapted from CDC
• 
  Coiled microfilaria of O. volvulus, in a skin nodule from a patient from Zambia, stained with H&E. Image taken at 1000x oil magnification.
  Adapted from CDC
• 
  Cross-section of an adult female O. volvulus, stained with H&E. Note the presence of many microfilariae within the uterus.
  Adapted from CDC

Adults of Onchocerca volvulus in tissue

• 
  Adult of O. volvulus in a subcutaneous nodule, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Adult of O. volvulus in a subcutaneous nodule, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Adult of O. volvulus in a subcutaneous nodule, stained with H&E.
  Adapted from CDC
• 
  Adult of O. volvulus in a subcutaneous nodule, stained with H&E.
  Adapted from CDC
• 
  Cross-section of an adult female Onchocerca sp. from the biopsy of a scalp nodule from a patient from Liberia. Note the presence of the intestine (blue arrow), uterine tubes (red arrows) and some cuticular nodules (green arrows). Also notice the weak musculature under the thick cuticle. Image courtesy of Drs. Philip LeBoit and Paul Borbeau.
  Adapted from CDC

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• Opisthorchiasis Return to Top

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• Opisthorchis felineus Return to Top

Adults of Opisthorchis felineus

• 
  Adult of O. felineus. Image courtesy of the Web Atlas of Medical Parasitology and the Korean Society for Parasitology.
  Adapted from CDC

Intermediate hosts of Opisthorchis spp.

• 
  Bithynia sp., a common intermediate host of Opisthorchis spp. Image courtesy of Michal Maňas.
  Adapted from CDC

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• Opisthorchis viverrini Return to Top

Eggs of Opisthorchis viverrini in wet mounts

• 
  Egg of O. viverrini in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
  Adapted from CDC
• 
  Egg of O. viverrini in an unstained wet mount of concentrated stool. Image taken at 400x magnification
  Adapted from CDC
• 
  Egg of O. viverrini in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
  Adapted from CDC
• 
  Egg of O. viverrini in an unstained wet mount of concentrated stool. Image taken at 400x magnification.
  Adapted from CDC

Adults of O. viverrini

• 
  Adult of O. viverrini. Image courtesy of the Web Atlas of Medical Parasitology and the Korean Society for Parasitology.
  Adapted from CDC

P

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• Paragonimiasis Return to Top

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• Paragonimus spp. Return to Top

Eggs of Paragonimus spp. in unstained wet mounts

• 
  Egg of P. westermani in an unstained wet mount.
  Adapted from CDC
• 
  Egg of P. westermani in an unstained wet mount.
  Adapted from CDC
• 
  Eggs of P. westermani in an unstained wet mount.
  Adapted from CDC
• 
  Egg of P. westermani in an unstained wet mount.
  Adapted from CDC

Eggs of Paragonimus spp. in tissue

• 
  Eggs of Paragonimus sp. taken from a lung biopsy stained with hematoxylin and eosin (H&E). These eggs measured 80-90 µm by 40-45 µm. The species was not identified in this case.
  Adapted from CDC
• 
  Egg of Paragonimus sp. taken from a lung biopsy stained with hematoxylin and eosin (H&E). This egg measured 80-90 µm by 40-45 µm. The species was not identified in this case.
  Adapted from CDC

Eggs of Paragonimus kellicotti

• 
  Cross-section of an egg of P. kellicotti in a lung biopsy specimen, stained with periodic acid-Schiff (PAS) stain. Image courtesy of Dr. Gary Procop.
  Adapted from CDC
• 
  Longitudinal section of an egg of P. kellicotti in a lung biopsy specimen, stained with hematoxylin and eosin (H&E). Image courtesy of Dr. Gary Procop.
  Adapted from CDC
• 
  Egg of P. kellicotti in a Pap-stained bronchial alveolar lavage (BAL) specimen at 100x magnification. Image courtesy of Dr. Gary Procop.
  Adapted from CDC
• 
  Eggs of P. kellicotti in a Pap-stained bronchial alveolar lavage (BAL) specimen at 400x magnification. Image courtesy of Dr. Gary Procop.
  Adapted from CDC
• 
  Higher magnification (1000x, oil) of the specimen in Figures 3 and 4. Image courtesy of Dr. Gary Procop.
  Adapted from CDC

Adults of Paragonimus spp.

• 
  Adult of P. westermani.
  Adapted from CDC
• 
  Higher magnification of the adult fluke seen in Figure 1.
  Adapted from CDC
• 
  Adult of Paragonimus sp., taken from a lung biopsy specimen stained with hematoxylin and eosin (H&E). Note the presence of the oral sucker. The species was not identified in this case.
  Adapted from CDC
• 
  Higher magnification of Figure 3, showing a close-up of the cuticle.
  Adapted from CDC
• 
  Adult of P. kellicotti taken from a lung biopsy specimen stained with H&E. This worm is in poor condition, indicating it was probably an old infection. Image courtesy of Dr. Miguel Madariaga, University of Nebraska Medical Center.
  Adapted from CDC
• 
  Sections of several adults of P. kellicotti taken from a pleural biopsy stained with H&E. Numbers 1-5 show the individual worms. The integument is gone from most of the worms, as this was probably an old infection, but remnants of the gonad (A, dart) and uterine tubes (B) can be seen. Image courtesy of Dr. Miguel Madariaga, University of Nebraska Medical Center. Image first appeared in: Madariaga, MD, M. G., T. Ruma, MD, and J. H. Theis, MD. 2007. Autochthonous human paragonimiasis in North America. Wilderness & Environmental Medicine. 18(3): 203-205. Image used with permission of © Allen Press Publishing Services.
  Adapted from CDC

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• Pediculosis Return to Top

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• Pediculosis sp. Return to Top

Head and Body Lice adults

• 
  Adult of P. humans capitis.
  Adapted from CDC
• 
  Adult female of P. humans capitis. In this specimen, eggs can be observed in the abdomen.
  Adapted from CDC
• 
  Adult of P. humanus.
  Adapted from CDC

Head and Body Lice nits

• 
  Egg ('nit') of P. humanus capitis, with a first-instar nymph starting to hatch out.
  Adapted from CDC
• 
  Empty shell of the nit in Figure 1, the nymph having left.
  Adapted from CDC

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• Pentatrichomonas hominis Return to Top

Pentatrichomonas hominis trophozoites

• 
  Trophozoite of P. hominis in a stool specimen, stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of P. hominis in a stool specimen, stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of P. hominis in a stool specimen, stained with trichrome.
  Adapted from CDC
• 
  Two trophozoites of P. hominis in a stool specimen, stained with trichrome.
  Adapted from CDC
• 
  Trophozoites of P. hominis in a stool specimen, stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of P. hominis in a stool specimen, stained with iron hematoxylin.
  Adapted from CDC

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• Philophthalmiasis Return to Top

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• Philophthalmus spp. Return to Top

Philophthalmus spp, adult flukes

• 
  Adult Philophthalmus sp., removed from the conjunctiva of a patient, stained with hematoxylin and eosin (H&E). In this figure, the following structures are labeled: oral sucker (OS), acetabulum (AC), and of the large, paired testes (TE). The positioning of the specimen during preparation did not allow for demonstration of the large pharynx.
  Adapted from CDC
• 
  Close up of the anterior end of the worm is Figure 1.
  Adapted from CDC
• 
  Adult Philophthalmus sp., removed from the conjunctiva of an artificially-infected chicken, stained with H&E. Illustrated in this figure is one of the large, paired testes (TE).
  Adapted from CDC
• 
  Close-up of the anterior end of the worm in Figure 3, showing a close-up of the oral sucker (OS), pharynx (PH), and acetabulum (AC).
  Adapted from CDC

Snail intermediate hosts of Philophthalmus spp.

• 
  Melanoides tuberculata, an intermediate host for Philophthalmus spp. in the Middle East.
  Adapted from CDC
• 
  Thiara sp., an intermediate host for Philophalmus gralli in southeast Asia and Hawaii. Image courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Semisulcospira spp., intermediate hosts for Philophthalmus spp. Images courtesy of Conchology, Inc, Mactan Island, Philippines.
  Adapted from CDC
• 
  Snails thyridium of Mesocestoides sp. in the liver of a laboratory-infected mouse.
  Adapted from CDC

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• Pneumocystis pneumonia (PCP) Return to Top

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• Pneumocystis jirovecii (previously Pneumocystis carinii) Return to Top

Pneumocystis jirovecii trophozoites

• 
  Trophozoites of P. jirovecii in a bronchoalveolar lavage (BAL) specimen from an AIDS patient, stained with Giemsa.
  Adapted from CDC

Pneumocystis jirovecii cysts

• 
  Cysts of P. jirovecii in lung tissue, stained with methenamine silver and hematoxylin and eosin (H&E). The walls of the cysts are stained black; the intracystic bodies are not visible with this stain.
  Adapted from CDC
• 
  Cysts of P. jirovecii in lung tissue, stained with methenamine silver and hematoxylin and eosin (H&E). The walls of the cysts are stained black; the intracystic bodies are not visible with this stain.
  Adapted from CDC

Indirect immunofluorescence using monoclonal antibodies against Pneumocystis jirovecii

• 
  Indirect immunofluorescence using monoclonal antibodies against Pneumocystis jirovecii.
  Adapted from CDC
• 
  Direct immunofluorescence antibody stain using monoclonal antibodies that target Pneumocystis jirovecii. This image is from a bronchoalveolar lavage (BAL) specimen from a patient with a malignancy. Image courtesy of Brigham & Women's Hospital, Boston, MA.
  Adapted from CDC

R

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• Retortamonas intestinalis Return to Top

Retortamonas intestinalis, trophozoites

• 
  Trophozoite of R. intestinalis in a stool specimen, stained with trichrome.
  Adapted from CDC
• 
  Trophozoite of R. intestinalis in a stool specimen, stained with trichrome.
  Adapted from CDC

Retortamonas intestinalis, cysts

• 
  Cyst of R. intestinalis in a stool specimen, stained with trichrome.
  Adapted from CDC
• 
  Cyst of R. intestinalis in a stool specimen, stained with trichrome.
  Adapted from CDC
• 
  Cyst of R. intestinalis in a stool specimen, stained with trichrome.
  Adapted from CDC
• 
  Cyst of R. intestinalis in a stool specimen, stained with trichrome.
  Adapted from CDC

S

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• Sarcocystosis Return to Top

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• Sarcocystis hominis Return to Top

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• Sarcocystis suihominis Return to Top

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• Sarcocystis spp. Return to Top

Sarcocystis oocysts in wet mounts

• 
  Sporulated oocyst of Sarcocystis sp. in an unstained wet mount, magnification 400x.
  Adapted from CDC
• 
  Individual sporocyst of Sarcocystis sp. in an unstained wet mount, magnification 400x.
  Adapted from CDC
• 
  Sporulated oocyst of Sarcocystis sp. in unstained wet mounts, magnification 400x.
  Adapted from CDC
• 
  Sporulated oocyst of Sarcocystis sp. in unstained wet mounts, magnification 400x.
  Adapted from CDC

Sarcocystis oocysts in wet mounts viewed under differential interference contrast (DIC)

• 
  Sporulated oocyst of Sarcocystis sp. in a wet mount viewed under differential interference contrast (DIC) microscopy, magnification 400x.
  Adapted from CDC
• 
  Individual sporocyst of Sarcocystis sp. in a wet mount viewed under DIC microscopy, magnification 400x.
  Adapted from CDC
• 
  Sporulated oocyst of Sarcocystis sp. in a wet mount viewed under DIC microscopy, magnification 400x.
  Adapted from CDC

Sarcocystis oocysts in wet mounts viewed under ultraviolet (UV) microscopy

• 
  Sporulated oocyst of Sarcocystis sp. in a wet mount viewed under UV microscopy, magnification 400x.
  Adapted from CDC
• 
  Sporulated oocyst of Sarcocystis sp. in a wet mount viewed under UV microscopy, magnification 400x.
  Adapted from CDC
• 
  Individual sporocyst of Sarcocystis sp. in a wet mount viewed under UV microscopy, magnification 400x.
  Adapted from CDC

Sarcocystis sarcocysts in tissue

• 
  Sarcocysts of Sarcocystis sp. in muscle tissue, stained with hematoxylin and eosin (H&E). Notice the bradyzoites within each sarcocyst. Images courtesy of the William Beaumont Hospital, Royal Oak, MI.
  Adapted from CDC
• 
  Sarcocysts of Sarcocystis sp. in muscle tissue, stained with hematoxylin and eosin (H&E). Notice the bradyzoites within each sarcocyst. Images courtesy of the William Beaumont Hospital, Royal Oak, MI.
  Adapted from CDC
• 
  Sarcocysts of Sarcocystis sp. in muscle tissue, stained with H&E. Image courtesy of the William Beaumont Hospital, Royal Oak, MI.
  Adapted from CDC
• 
  Higher magnification of one of the sarcocysts in Figure 3, showing many bradyzoites.
  Adapted from CDC
• 
  Sarcocyst of Sarcocystis sp. in muscle tissue, stained with H&E (magnification 500x).
  Adapted from CDC
• 
  Higher magnification (1000x) of the sarcocyst in Figure 5, showing many bradyzoites.
  Adapted from CDC

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• Schistosomiasis (Bilharziasis) Return to Top

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• Schistosoma haematobium Return to Top

• 
  Egg of S. haematobium in a wet mount of urine concentrates, showing the characteristic terminal spine.
  Adapted from CDC
• 
  Egg of S. haematobium in a wet mount of urine concentrates, showing the characteristic terminal spine.
  Adapted from CDC
• 
  Egg of S. haematobium in a wet mount of a urine concentrate.
  Adapted from CDC

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• Schistosoma intercalatum Return to Top

• 
  Egg of S. intercalatum in a wet mount.
  Adapted from CDC
• 
  Egg of S. intercalatum in a wet mount.
  Adapted from CDC

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• Schistosoma japonicum Return to Top

• 
  Egg of S. japonicum in an unstained wet mount. Note the small, inconspicuous spines (red arrows).
  Adapted from CDC
• 
  Egg of S. japonicum in an unstained wet mount. Note the small, inconspicuous spines (red arrows).
  Adapted from CDC
• 
  Egg of S. japonicum in an unstained wet mount of stool. The spine is not visible in either of these specimens.
  Adapted from CDC
• 
  Egg of S. japonicum in an unstained wet mount of stool. The spine is not visible in either of these specimens.
  Adapted from CDC
• 
  Egg of S. japonicum in an unstained wet mount of stool.
  Adapted from CDC
• 
  Egg of S. japonicum in an unstained wet mount of stool.
  Adapted from CDC

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• Schistosoma mansoni Return to Top

• 
  Egg of S. mansoni in an unstained wet mount. Images courtesy of the Wisconsin State Laboratory of Hygiene.
  Adapted from CDC
• 
  Egg of S. mansoni in an unstained wet mount. Images courtesy of the Wisconsin State Laboratory of Hygiene.
  Adapted from CDC
• 
  Egg of S. mansoni in an unstained wet mount. Images courtesy of the Missouri State Public Health Laboratory.
  Adapted from CDC
• 
  Egg of S. mansoni in an unstained wet mount. Images courtesy of the Missouri State Public Health Laboratory.
  Adapted from CDC
• 
  Eggs of S. mansoni in an unstained wet mount.
  Adapted from CDC
• 
  Egg of S. mansoni in an unstained wet mount.
  Adapted from CDC
• 
  Adults of S. mansoni. The thin female resides in the gynecophoral canal of the thicker male.
  Adapted from CDC
• 
  Adults of S. mansoni. The thin female resides in the gynecophoral canal of the thicker male. Note the tuberculate exterior of the male.
  Adapted from CDC

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• Schistosoma mekongi Return to Top

• 
  Egg of S. mekongi. Note the inconspicuous spine (red arrow).
  Adapted from CDC

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• Sparganosis Return to Top

Proliferating spargana in groin tissue

• 
  Proliferating sparganum in groin tissue of a patient from Paraguay, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Proliferating spargana in groin tissue of a patient from Paraguay, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Proliferating sparganum in groin tissue of a patient from Paraguay, stained with hematoxylin and eosin (H&E).
  Adapted from CDC

Proliferating spargana in lung tissue

• 
  Proliferating sparganum in lung tissue in a patient from Taiwan, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Higher magnification of the sparganum in Figure 1. In this image, calcareous corpuscles (green arrows) can be seen.
  Adapted from CDC
• 
  Proliferating sparganum in lung tissue in a patient from Taiwan, stained with H&E.
  Adapted from CDC
• 
  Higher magnification of the sparganum in Figure 3. In this image, calcareous corpuscles (green arrows) can be seen.
  Adapted from CDC

Spargana removed from tissue

• 
  Sparganum removed from the chest wall of a patient. The worm measured about 70 mm long. Images from a specimen courtesy of the Oklahoma State Department of Health.
  Adapted from CDC
• 
  Sparganum removed from the chest wall of a patient. The worm measured about 70 mm long. Images from a specimen courtesy of the Oklahoma State Department of Health.
  Adapted from CDC
• 
  Close-up of the anterior end of the sparganum in Figures 1 and 2. Note the end is thickened and wrinkled, and possesses a characteristic cleft-like invagination.
  Adapted from CDC
• 
  Sparganum removed from the ocular conjunctiva of a patient from Taiwan. The worm measured 40 mm long. Image courtesy of Dr. John H. Cross and the Uniformed Services University of the Health Sciences, Bethesda, MD.
  Adapted from CDC

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• Sparganum proliferum Return to Top

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• Spirometra erinacei Return to Top

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• Spirometra mansoni Return to Top

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• Spirometra mansonoides Return to Top

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• Spirometra ranarum Return to Top

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• Strongyloidiasis Return to Top

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• Strongyloides stercoralis Return to Top

Strongyloides stercoralis first-stage rhabditiform (L1) larvae

• 
  Rhabditiform larva of S. stercoralis in unstained wet mounts of stool. Notice the short buccal canal and the genital primordium (red arrows).
  Adapted from CDC
• 
  Rhabditiform larva of S. stercoralis in unstained wet mounts of stool. Notice the short buccal canal and the genital primordium (red arrows).
  Adapted from CDC
• 
  Close-up of the anterior end of a rhabditiform larva of S. stercoralis, showing the short buccal canal (red arrow) and the rhabditoid esophagus (blue arrow). Image taken at 1000x oil magnification.
  Adapted from CDC
• 
  Rhabditiform larva of S. stercoralis in an unstained wet mount of stool. Notice the short buccal canal and the genital primordium (red arrow).
  Adapted from CDC
• 
  Rhabditiform larva of S. stercoralis in an unstained wet mount of stool. Notice the rhabditoid esophagus (blue arrow) and prominent genital primordium (red arrow).
  Adapted from CDC
• 
  Rhabditiform larva of S. stercoralis in an unstained wet mount of stool. Notice the prominent genital primordium (blue arrow), rhabditoid esophagus (red arrow) and short buccal canal (green arrow).
  Adapted from CDC

Strongyloides stercoralis third-stage filariform (L3) larvae

• 
  Filariform (L3) larva of S. stercoralis in an unstained wet mount.
  Adapted from CDC
• 
  Filariform (L3) larva of S. stercoralis in a sputum specimen, stained with Giemsa. Image taken at 200x magnification.
  Adapted from CDC
• 
  Higher magnification (1000x oil) of the worm in Figure 2. Notice the notched tail.
  Adapted from CDC

Strongyloides stercoralis free-living adults

• 
  Free-living adult male S. stercoralis. Notice the presence of the spicule (red arrow).
  Adapted from CDC
• 
  Free living adult male S. stercoralis, showing a spicule (red arrow). A smaller, rhabditiform larva lies adjacent to the adult male.
  Adapted from CDC
• 
  Adult free-living female S. stercoralis alongside a smaller rhabditiform larva. Notice the developing eggs in the adult female.
  Adapted from CDC
• 
  Adult free-living female S. stercoralis. Notice the row of eggs within the female’s body.
  Adapted from CDC

Strongyloides stercoralis in tissue

• 
  Cross-sections of female S. stercoralis (blue arrows) in small intestine tissue, stained with H&E. Image taken at 200x magnification.
  Adapted from CDC
• 
  Sections of S. stercoralis from a duodenal biopsy specimen, stained with H&E. Although strongyloidiasis could not be confirmed based on microscopy alone, this case was confirmed using molecular methods (PCR). Image taken at 200x magnification.
  Adapted from CDC
• 
  Higher magnification (1000x oil) of a female of S. stercoralis from the same specimen as Figure 1. Notice the intestine (red arrow) and ovaries (blue arrows).
  Adapted from CDC
• 
  Higher magnification (1000x oil) of a gravid female of S. stercoralis from the same specimen as Figure 1. Notice the intestine (blue arrow), ovary (red arrow) and an egg within the uterus (green arrow).
  Adapted from CDC
• 
  Cross-sections of larvae of S. stercoralis in a intestinal biopsy specimen, stained with H&E. Image taken at 1000x oil magnification. The patient was infected with Strongyloides following transplant of an infected kidney.
  Adapted from CDC
• 
  Longitudinal-section of a larva of S. stercoralis from the same specimen as Figure 5. Image taken at 400x magnification.
  Adapted from CDC

T

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• Taeniasis Return to Top

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• Taenia spp. Return to Top

Taenia spp. eggs

• 
  Taenia sp. eggs in unstained wet mounts.
  Adapted from CDC
• 
  Taenia sp. egg in unstained wet mounts.
  Adapted from CDC
• 
  Iodine-stained wet mount of a Taenia sp. egg. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
• 
  Iodine-stained wet mount of a Taenia sp. egg. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
• 
  Unstained Taenia sp. egg, teased from a proglottid of an adult. Four hooks can easily be seen in this image.
  Adapted from CDC

Taenia spp. scoleces

• 
  Scolex of T. solium. Note the four large suckers and rostellum containing two rows of hooks.
  Adapted from CDC
• 
  Scolex of T. solium. Note the four large suckers and rostellum containing two rows of hooks.
  Adapted from CDC
• 
  Scolex of T. saginata. Note the four large suckers and lack of rostellum and rostellar hooks.
  Adapted from CDC

Taenia spp. proglottids

• 
  Mature proglottid of T. saginata, stained with carmine. Note the number of primary uterine branches (>12).
  Adapted from CDC
• 
  Mature proglottid of T. saginata, stained with India ink. Note the number of primary uterine branches (>12). Image courtesy of the Orange County Public Health Laboratory, Santa Ana, CA.
  Adapted from CDC
• 
  Mature proglottid of T. solium, stained with carmine. Note the number of primary uterine branches (<13).
  Adapted from CDC
• 
  Mature proglottid of T. solium, stained with India ink. Note the number of primary uterine branches (<13) in the lower specimen.
  Adapted from CDC
• 
  Proglottid of T. saginata unstained. Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC
• 
  The same proglottid as in Figure 5 injected with India ink, demonstrating the number of primary uterine branches (>12). Image courtesy of the Oregon State Public Health Laboratory.
  Adapted from CDC

Cross-sections of Taenia spp. stained with hematoxylin and eosin (H&E)

• Cross-section of a proglottid of Taenia sp., stained with H&E. Note the thick outer tegument and the loose parenchyma filling the body. Calcareous corpuscles (red arrows), characteristic of the cestodes, can be seen in the parenchyma. Image courtesy of the Washington State Public Health Laboratories. Adapted from CDC
  Cross-section of a proglottid of Taenia sp., stained with H&E. Note the thick outer tegument and the loose parenchyma filling the body. Calcareous corpuscles (red arrows), characteristic of the cestodes, can be seen in the parenchyma. Image courtesy of the Washington State Public Health Laboratories.
  Adapted from CDC
• 
  Cross-section of a proglottid of Taenia sp., stained with H&E. Note the thick outer tegument and the loose parenchyma filling the body. Calcareous corpuscles (red arrows), characteristic of the cestodes, can be seen in the parenchyma. Eggs (blue arrows) can also be seen. Image courtesy of the Washington State Public Health Laboratories.
  Adapted from CDC
• 
  Higher magnification of the image in Figure 2, showing a close-up of the eggs. Note the characteristic striations, typical for the taeniids. Not visible in these images are the hooks commonly seen in cestode eggs. Hooks do not stain with H&E but are refractile and are visible with fine focusing of the microscope
  Adapted from CDC
• 
  Higher magnification of the image in Figure 2, showing a close-up of the eggs. Note the characteristic striations, typical for the taeniids. Not visible in these images are the hooks commonly seen in cestode eggs. Hooks do not stain with H&E but are refractile and are visible with fine focusing of the microscope.
  Adapted from CDC
• Close-up of a cross-section of a Taenia sp. proglottid stained with H&E, showing numerous calcareous corpuscles (yellow arrows). Image courtesy of the Michael E. DeBakey V. A. Medical Center in Houston, TX. Adapted from CDC
  Close-up of a cross-section of a Taenia sp. proglottid stained with H&E, showing numerous calcareous corpuscles (yellow arrows). Image courtesy of the Michael E. DeBakey V. A. Medical Center in Houston, TX.
  Adapted from CDC
• Close-up of a cross-section of a Taenia sp. proglottid stained with H&E, showing numerous calcareous corpuscles. Image courtesy of Ameripath. Adapted from CDC
  Close-up of a cross-section of a Taenia sp. proglottid stained with H&E, showing numerous calcareous corpuscles. Image courtesy of Ameripath.
  Adapted from CDC

Taenia spp. adults

• Taenia saginata adult worm. The adult in this image is approximately 4 meters in length. Adapted from CDC
  Taenia saginata adult worm. The adult in this image is approximately 4 meters in length.
  Adapted from CDC
• Taenia saginata adult worm. Adapted from CDC
  Taenia saginata adult worm.
  Adapted from CDC

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• Thelaziasis Return to Top

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• Thelazia spp. Return to Top

Thelazia spp. adults

• 
  Anterior end of a female Thelazia sp. Note the lack of lips (arrow) and prominent striations.
  Adapted from CDC
• 
  Mid-section of a female Thelazia sp. Note the prominent striations.
  Adapted from CDC
• 
  Mid-section of a gravid female Thelazia sp., showing many typical spirurid-type eggs.
  Adapted from CDC
• 
  Posterior end of a female Thelazia sp.
  Adapted from CDC

Intermediate hosts of Thelazia spp.

• 
  Fannia canicularis, the lesser house fly. This species has been implicated in the transmission of thelaziasis in the United States and Asia. Image courtesy of Parasite and Diseases Image Library, Australia.
  Adapted from CDC
• 
  Musca domestica, the house fly. This species has been implicated in the transmission of thelaziasis in the United States and Asia. Image courtesy of Parasite and Diseases Image Library, Australia.
  Adapted from CDC

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• Toxocariasis Return to Top

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• Toxocara canis Return to Top

Toxocara canis larva hatching

• 
  Toxocara canis larva beginning to hatch.
  Adapted from CDC
• 
  T. canis larva hatching.
  Adapted from CDC
• 
  T. canis larva.
  Adapted from CDC

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• Toxocara cati Return to Top

Adult Toxocara cati worms

• 
  Close-up of the anterior end of Toxocara cati, showing the three lips characteristic of ascarid worms.
  Adapted from CDC
• 
  Side view of Figure 1, showing the broad, arrow-shaped alae with striations, characteristic of T. cati.
  Adapted from CDC
• 
  Close-up of the posterior end of T. cati, showing a prominent point at the end of the “tail.”.
  Adapted from CDC

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• Toxoplasmosis Return to Top

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• Toxoplasma gondii Return to Top

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• Trichinellosis (Trichinosis) Return to Top

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• Trichinella spp. Return to Top

Encysted larvae of Trichinella in tissue, stained with hematoxylin and eosin (H&E)

• Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). The image magnification is 200x. Adapted from CDC
  Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). The image magnification is 200x.
  Adapted from CDC
• 
  Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). The image magnification is 400x.
  Adapted from CDC
• 
  Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). Image was captured at 400x magnification.
  Adapted from CDC
• 
  Encysted larvae of Trichinella sp. in muscle tissue, stained with hematoxylin and eosin (H&E). Image was were captured at 400x magnification.
  Adapted from CDC
• 
  Higher-magnification of the larvae in Figure 3. Shown in these cuts are a nucleated stichocyte (ST), prominent lateral chords, or bacillary bands, (LC), immature reproductive tubes (RT), and the intestine (IN). Image captured at 1000x magnification.
  Adapted from CDC

Trichinella larvae in tongue tissue of a rat, stained with H&E

• 
  Trichinella larva in tongue muscle of a rat, stained with hematoxylin and eosin (H&E). Image was captured at 400x magnification.
  Adapted from CDC
• 
  Trichinella larva in tongue muscle of a rat, stained with hematoxylin and eosin (H&E). Image was captured at 400x magnification.
  Adapted from CDC

Larvae of Trichinella from bear meat

• 
  Trichinella larvae in pressed bear meat, partially digested with pepsin.
  Adapted from CDC
• 
  Trichinella larva in pressed bear meat, partially digested with pepsin.
  Adapted from CDC
• 
  Trichinella larvae in pressed bear meat, partially digested with pepsin.
  Adapted from CDC
• 
  Trichinella larvae in pressed bear meat, partially digested with pepsin.
  Adapted from CDC
• 
  Larva of Trichinella liberated from bear meat. This larva is from a different case than those shown in Figures 1-4.
  Adapted from CDC
• 
  Larva of Trichinella liberated from bear meat. This larva is from a different case than those shown in Figures 1-4.
  Adapted from CDC

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• Trichostrongylosis Return to Top

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• Trichostrongylus spp. Return to Top

Trichostrongylus spp. eggs in wet mounts

• 
  Egg of Trichostrongylus sp. in an unstained wet mount of stool.
  Adapted from CDC
• 
  Egg of Trichostrongylus sp. in an unstained wet mount of stool.
  Adapted from CDC
• 
  Egg of Trichostrongylus sp. in an unstained wet mount of stool. Image courtesy of the Indiana State Department of Health.
  Adapted from CDC
• 
  Egg of Trichostrongylus sp. in an unstained wet mount of stool. Image courtesy of the Indiana State Department of Health.
  Adapted from CDC

Trichostrongyle eggs in wet mounts

• 
  Egg of a trichostrongyle in an unstained wet mount of stool from a patient from Afghanistan. Eggs ranged in size from 87-92 µm in length by 50-55 µm in width. Images courtesy of the Leiden University Medical Center, The Netherlands.
  Adapted from CDC
• 
  Egg of a trichostrongyle in an unstained wet mount of stool from a patient from Afghanistan. Eggs ranged in size from 87-92 µm in length by 50-55 µm in width. Images courtesy of the Leiden University Medical Center, The Netherlands.
  Adapted from CDC
• 
  Egg of a trichostrongyle from the same specimen as Figures 1 and 2. In this egg, a developing larva can be observed.
  Adapted from CDC

Trichostrongylus adults

• 
  Anterior end of a female Trichostrongylus sp. Image of a glycerin-mounted specimen, taken at 200x magnification.
  Adapted from CDC
• 
  Posterior end of the same specimen as Figure 1. Note the pointed tail. Image taken at 200x magnification.
  Adapted from CDC
• 
  Midsection of the same specimen from Figures 1 and 2. Note a row of eggs in the uterus.
  Adapted from CDC
• 
  Posterior end of a male Trichostrongylus sp. Note the presence of a bursa (red arrow) and spicule (blue arrow). of a glycerin-mounted specimen, taken at 200x magnification.
  Adapted from CDC

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• Trichuriasis (Whip Worm) Return to Top

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• Tungiasis Return to Top

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• Tunga penetrans Return to Top

Tunga penetrans

• 
  Tunga penetrans removed from a lesion on the bottom of the foot of a patient who traveled to Africa. The bulk of the lesion and the posterior part of the flea are marked with a blue arrow. The anterior end of the flea, showing the head, mouthparts and forelegs, is marked with a green arrow. Note the lack of pronotal and genal combs. A single egg (yellow arrow), is also shown.
  Adapted from CDC
• 
  Eggs of T. penetrans liberated from the lesion on the second toe of a patient who traveled to Guyana. Image courtesy of Spectrum Health, Grand Rapids, MI.
  Adapted from CDC
• 
  Close-up of the eggs from the specimen in Figure 2.
  Adapted from CDC

Tunga penetrans lesions and biopsy specimens

• 
  Gross lesion on a patient's foot caused by T. penetrans. Image courtesy of Drs. Mohammed Asmal and Rocio M. Hurtado. Image first appeared at Partners' Infectious Disease Images (http://www.idimages.org), whose content is copyrighted by Partners Healthcare System, Inc., and is used with permission.
  Adapted from CDC
• 
  Gross lesion on a patient's foot caused by T. penetrans. Image courtesy of Drs. Mohammed Asmal and Rocio M. Hurtado. Image first appeared at Partners' Infectious Disease Images (http://www.idimages.org), whose content is copyrighted by Partners Healthcare System, Inc., and is used with permission.
  Adapted from CDC
• 
  Cross-sections of T. penetrans in tissue, stained with hematoxylin and eosin (H&E).
  Adapted from CDC
• 
  Cross-sections of T. penetrans in tissue, stained with hematoxylin and eosin (H&E). In this image, the following structures are labeled: cuticle (CU), gut (GU), and developing eggs (EG).
  Adapted from CDC