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Clonorchis sinensis
''Clonorchis sinensis'', the Chinese liver fluke, is a human liver fluke in the class Trematoda, phylum Platyhelminthes. This parasite lives in the liver of humans, and is found mainly in the common bile duct and gall bladder, feeding on bile. These animals, which are believed to be the third most prevalent worm parasite in the world, are endemic to Japan, China, Taiwan, and Southeast Asia, currently infecting an estimated 30,000,000 humans. 85% of cases are found in China.
It is the most prevalent human trematode in Asia, and still actively transmitted in Korea, China, Vietnam and also Russia, with 200 million people at constant risk. Recent studies have proved that it is capable of causing cancer of liver and bile duct, and in fact the International Agency for Research on Cancer has classed it as a group 1 biological carcinogen in 2009.
== Life cycle ==
The eggs of a ''C. sinensis'', which contain the miracidium that develops into the adult form, float in fresh water until eaten by a snail.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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