File:Clonorchis sinensis LifeCycle.png

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Descrizione
English: Clonorchiasis [Clonorchis sinensis]

Causal Agent: The trematode Clonorchis sinensis (Chinese or oriental liver fluke).

Life Cycle:

Life cycle of Clonorchis sinensis

Embryonated eggs are discharged in the biliary ducts and in the stool . Eggs are ingested by a suitable snail intermediate host ; there are more than 100 species of snails that can serve as intermediate hosts. Each egg releases a miracidia , which go through several developmental stages (sporocysts , rediae , and cercariae ). The cercariae are released from the snail and after a short period of free-swimming time in water, they come in contact and penetrate the flesh of freshwater fish, where they encyst as metacercariae . Infection of humans occurs by ingestion of undercooked, salted, pickled, or smoked freshwater fish . After ingestion, the metacercariae excyst in the duodenum and ascend the biliary tract through the ampulla of Vater . Maturation takes approximately 1 month. The adult flukes (measuring 10 to 25 mm by 3 to 5 mm) reside in small and medium sized biliary ducts. In addition to humans, carnivorous animals can serve as reservoir hosts.

Geographic Distribution:

Endemic areas are in Asia including Korea, China, Taiwan, and Vietnam. Clonorchiasis has been reported in non endemic areas (including the United States). In such cases, the infection is found in Asian immigrants, or following ingestion of imported, undercooked or pickled freshwater fish containing metacercariae.
Fonte http://www.dpd.cdc.gov/dpdx/images/ParasiteImages/A-F/Clonorchiasis/Clonorchis_LifeCycle.gif
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This image is a work of the Centers for Disease Control and Prevention, part of the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.
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Data/Ora Dimensioni Utente Commento
10 maggio 2006, 18:38:10 562 × 435 (29271 bytes) Patho (discussione · contributi) {{Information| |Description=Clonorchiasis [Clonorchis sinensis] Causal Agent: The trematode Clonorchis sinensis (Chinese or oriental liver fluke). Life Cycle: Life cycle of Clonorchis sinensis Embryonated eggs are discharged in the biliary ducts an

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