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Parazitologie

Fascioloza


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Immature eggs are discharged into the intestine and stool  .
Eggs become embryonated in water  , eggs release miracidia  , which invade a suitable snail intermediate host  . In the snail the parasites undergo several developmental stages (sporocysts  , rediae  , and cercariae  ). The cercariae are released from the snail   and encyst as metacercariae on aquatic plants  . The mammalian hosts become infected by ingesting metacercariae on the aquatic plants. After ingestion, the metacercariae excyst in the duodenum   and attach to the intestinal wall. There they develop into adult flukes (20 to 75 mm by 8 to 20 mm) in approximately 3 months, attached to the intestinal wall of the mammalian hosts (humans and pigs)  . The adults have a life span of about one year.

Adult fluke of Fasciolopsis buski.
The adult flukes range in size: 20 to 75 mm by 8 to 20 mm.

Fascioliasis.
Section of liver showing adult worm
of Fasciola hepatica lying within a bile duct.

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