Opisthorchiasis pathophysiology: Difference between revisions
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==Pathophysiology== | ==Pathophysiology== | ||
Etiologic agent: | |||
Trematodes (flukes) Opisthorchis viverrini (Southeast Asian liver fluke) and O. felineus (cat liver fluke). | Trematodes (flukes) Opisthorchis viverrini (Southeast Asian liver fluke) and O. felineus (cat liver fluke). | ||
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The adult flukes (O. viverrini: 5 mm to 10 mm by 1 mm to 2 mm; O. felineus: 7 mm to 12 mm by 2 mm to 3 mm) reside in the biliary and pancreatic ducts of the mammalian host, where they attach to the mucosa. | The adult flukes (O. viverrini: 5 mm to 10 mm by 1 mm to 2 mm; O. felineus: 7 mm to 12 mm by 2 mm to 3 mm) reside in the biliary and pancreatic ducts of the mammalian host, where they attach to the mucosa. | ||
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== External Links == | == External Links == | ||
http://www.dpd.cdc.gov/dpdx/HTML/Opisthorchiasis.htm | http://www.dpd.cdc.gov/dpdx/HTML/Opisthorchiasis.htm | ||
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[[Category:Needs overview]] | [[Category:Needs overview]] | ||
[[Category:Helminthiases]] | [[Category:Helminthiases]] | ||
[[Category:Disease]] | [[Category:Disease]] | ||
[[Category:Parasitic diseases]] | [[Category:Parasitic diseases]] | ||
{{WH}} | {{WH}} | ||
{{WS}} | {{WS}} | ||
Latest revision as of 18:32, 18 September 2017
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Opisthorchiasis Microchapters |
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Opisthorchiasis pathophysiology On the Web |
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Risk calculators and risk factors for Opisthorchiasis pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Pathophysiology
Etiologic agent:
Trematodes (flukes) Opisthorchis viverrini (Southeast Asian liver fluke) and O. felineus (cat liver fluke).
Life cycle:
The adult flukes deposit fully developed eggs that are passed in the feces 1.
After ingestion by a suitable snail (first intermediate host) 2, the eggs release miracidia 2a, which undergo in the snail several developmental stages (sporocysts 2b, rediae 2c, cercariae 2d).
Cercariae are released from the snail 3 and penetrate freshwater fish (second intermediate host), encysting as metacercariae in the muscles or under the scales 4.
The mammalian definitive host (cats, dogs, and various fish-eating mammals including humans) become infected by ingesting undercooked fish containing metacercariae.
After ingestion, the metacercariae excyst in the duodenum 5 and ascend through the ampulla of Vater into the biliary ducts, where they attach and develop into adults, which lay eggs after 3 to 4 weeks 6.
The adult flukes (O. viverrini: 5 mm to 10 mm by 1 mm to 2 mm; O. felineus: 7 mm to 12 mm by 2 mm to 3 mm) reside in the biliary and pancreatic ducts of the mammalian host, where they attach to the mucosa.
External Links
http://www.dpd.cdc.gov/dpdx/HTML/Opisthorchiasis.htm