Main » Infectious diseases » Snail-mediated Helminthiases » Fasciola hepatica and Fasciola gigantica
Photo 1. Ecology of fascioliasis, Lymnaea snail in wet pasteurage. F. hepatica is a cosmopolitan disease of sheep, cattle and other herbivorous mammals. Man is commonly infected by eating wild watercress on which metacercariae have encysted.
Photo 2. Lymnaea swinhoei. This snail is a host for F. hepatica in Taiwan.
Photo 3. Adult flukes in bile ducts of a sheep liver. The adult flukes live in the bile ducts of sheep where they cause serious damage to the biliary tract.
Photo 4. Migrating flukes in liver. After being swallowed the metacercariae pass through the intestinal wall and penetrate the liver via the liver capsule. The figure shows a sheep liver with migrating immature flukes. (x20)
Photo 5. Adult F. hepatica in section of liver. The surface spines of the adult fluke produce mechanical damage to the biliary epithelium. (x350)
Photo 6. Miracidia, redia, and cercaria of F. hepatica. Miracidia (6) hatched from eggs passed in faeces, infect snails of the genus Lymnaea where they develop through a typical trematode cycle, producing rediae (7), and cercariae (8). In England the common intermediate host is L. truncatula . (x150);(x25);(x60)
Photo 7. Redia.
Photo 8. Cercaria of F. hepatica (3).
Photo 9. Metacercariae on grass. The cercariae encyst on grass or other moist herbage such as watercress. When the metacercariae are ingested the cycle recommences. (x20)
Photo 10. F. gigantica in bile duct of cow. This species is the common liver fluke of cattle in Egypt where man is also infected occasionally.
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