Diphyllobothriasis laboratory tests

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Furqan M M. M.B.B.S[2]

Laboratory Findings

Microscopy

Microscopic identification of eggs in the stool is the basis of specific diagnosis. Eggs are usually numerous and can be demonstrated without concentration techniques. Examination of proglottids passed in the stool is also of diagnostic value.

Eggs

Diphyllobothrium spp. eggs are oval or ellipsoidal and range in size from 55 to 75 µm by 40 to 50 µm. There is an operculum at one end that can be inconspicuous, and at the opposite (abopercular) end is a small knob that can be barely discernible. The eggs are passed in the stool unembryonated.

Adults

Adults of Diphyllobothrium spp. may be 4-10 meters in length. The scolex is elongated, 1mm by 3mm, with two shallow, longitudinal grooves. As proglottids mature, they may break off from the stroblia, in lengths containing few to many segments. Proglottids are broader than they are long and range from 2 to 4 mm long by 10 to 12 mm wide. The uterus is coiled in rosette appearance and the genital pore is at the center of the proglottid. There are numerous tests that appear in the lateral fields of each proglottid.

Images

• 
  Egg of Diphyllobothrium latum with an operculum.
• 
  Pinworms are sometimes diagnosed incidentally by pathology. Micrograph of pinworms in the appendix. H&E stain.
• 
  Proglottids and the rosette-shaped uterus at the center of each proglottid.
• 
  Adult D. latum containing many proglottids (Image courtesy of the Florida State Public Health Laboratory).
• 
  Carmine-stained proglottids of D. latum, showing the rosette-shaped ovaries.
• 
  Carmine-stained proglottids of D. latum, showing the rosette-shaped ovaries.

References

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