<unk>  sinensis is a trematode (fluke) which is part of the phylum Platyhelminthes. The parasitic worm is as long as 10 to 25 mm and lives in the bile ducts of the liver. It is a hermaphroditic fluke that requires two intermediate hosts. The eggs of the worms are passed in fecal matter into a body of water and are then ingested by mollusks. The water snail is the first intermediate host, in which a miracidium (an embryonated egg discharged in stool) goes through its developmental stages (sporocyst, rediae and cercariae). Freshwater fish are a second intermediate host for the parasitic worm. They become infected when the larva (cercaria) of the worm leaves the snail and penetrates the flesh of the fish. Humans then become infected by eating infected fish that has been undercooked, smoked, pickled, or salted, and from there the cycle repeats.<unk>  is endemic in the Far East, especially in Korea, Japan, Taiwan, and Southern China.<unk>  has been reported in areas to which it is not endemic (including the United States). In such cases, the infection follows the ingestion of undercooked or pickled freshwater fish imported from one of the endemic areas and containing metacercariae.
Clonorchiasis
Opisthorchiasis
Taeniasis
Monorchism
Trichuriasis
Trichiasis
Trichomoniasis
Naegleriasis