fluke

Any of various parasitic flatworms of the classes Monogenea and Digenea, that as adults live in and destroy the livers of sheep, cattle, horses, dogs, and humans. Monogenetic flukes can complete their life cycle in one host; digenetic flukes require two or more hosts, for example a snail and a human being, to complete their life cycle.

Fluke-caused diseases, such as bilhazia, affect tens of millions of people, mostly in sub-Saharan Africa.