Fasciola hepatica encysted metacercaria stage.
Автор: Dr. Marwa Omar, Zagazig University
Загружено: 2025-09-12
Просмотров: 46
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SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Footage filmed at Ridgeway Research, Gloucestershire, United Kingdom.
Metacercariae attached to vegetation are ingested by humans eating contaminated aquatic vegetations, like watercress. In the duodenum, immature flukes emerge from these cysts and migrate into the bile ducts. Here they reach maturity and pass immature eggs into the faeces, which contaminate water. After embryonation, the eggs hatch producing larvae which infect certain species of freshwater snail, named Lymnaea truncatula, the liver fluke's intermediate host. Cercarial stages emerge from the snail and form metacercarial cysts on nearby vegetation, thus continuing the fluke's life cycle. Liver flukes cause fascioliasis, a liver disease with symptoms including digestive problems, fever, pain, anaemia and jaundice.
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