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''Opisthorchis viverrini'', common name Southeast Asian liver fluke, is a trematode parasite from the family Opisthorchiidae that attacks the area of the bile duct. Infection is acquired when people ingest raw or undercooked fish.〔 It causes the disease opisthorchiasis (also called clonorchiasis).〔 ''Opisthorchis viverrini'' infection also predisposes the infected for cholangiocarcinoma, a cancer of the gall bladder and/or its ducts. ''Opisthorchis viverrini'' (together with ''Clonorchis sinensis'' and ''Opisthorchis felineus'') is one of the three most medically important species in the family Opisthorchiidae. In fact ''O. viverrini'' and ''C. sinensis'' are capable of causing cancer in humans, and are classified by the International Agency for Research on Cancer as a group 1 biological carcinogen in 2009. ''O. viverrini'' is endemic throughout Thailand, the Lao People's Democratic Republic, Vietnam and Cambodia.〔 In Northern Thailand, it is widely distributed, with high prevalence in humans, while in Central Thailand there is low rate of prevalence. The disease opisthorchiasis (caused by ''Opisthorchis viverrini'') does not occur in southern Thailand.〔 == Description == The testes of an adult ''Opisthorchis viverrini'' are lobed〔 in comparison of dendritic testes of ''Clonorchis sinensis''.〔 The eggs of ''Opisthorchis viverrini'' are 30 × 12 μm in size〔 and they are slightly narrower and more regularly ovoid than in ''Clonorchis sinensis''.〔 But eggs of ''Opisthorchis viverrini'' are visually indisgushiable in Kato technique smears from other eggs of flukes from other fluke family Heterophyidae.〔 The metacercariae of ''Opisthorchis viverrini'' are brownish, elliptical with two nearly equal-sized suckers: the oral sucker and the ventral sucker.〔 They are 0.19–0.25 × 0.15–0.22 mm in size.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Opisthorchis viverrini」の詳細全文を読む スポンサード リンク
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