Life Cycle
Opisthorchis viverrini is a hermaphroditic liver fluke. Its life cycle is similar to the life cycle of Clonorchis sinensis. It involves a freshwater snail, in which asexual reproduction takes place, and freshwater cyprinid fishes (family Cyprinidae) as intermediate hosts. Fish–eating (= piscivorous) mammals, including humans, dogs and cats, act as definitive hosts, in which sexual reproduction occurs. As a result of poor sanitation practices and inadequate sewerage infrastructure, Opisthorchis viverrini-infected people pass the trematode's eggs in their feces into bodies of fresh water.
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