Clonorchis sinensis
Clonorchis ( Clonorchis sinensis)
The Chinese liver fluke ( Clonorchis sinensis ) is a parasite belonging to the class of trematodes. Definitive hosts are fish-eating mammals ( cats) and humans. Worldwide 20 to 30 million people are infected, according to estimates.
Dissemination
The Chinese liver fluke is found in East Asia (China, Taiwan, Hong Kong, Vietnam, Japan, Korea). The life cycle is tied to freshwater.
Features
Adult flukes is flattened 10 to 25 mm long and 3-5 mm wide. He has two suction cups (oral and ventral). Clonorchis means " twig -shaped testicles " and describes the area visible through the transparent parenchyma structure of the male reproductive organs of the parasite. The worms are hermaphrodites.
Life cycle
The life cycle begins with the deposition of eggs in the faeces of the host. The first intermediate host is a freshwater snail ( Bithynia siamensis ), in which the miracidium ( Flimmerlarve ) hatches after recording. Within the snail, the miracidium transforms into a sporocyst ( breeding tube), produced internally by budding rediae ( rod larvae). The rediae in turn develop - still within the screw - on and put through further asexual reproduction cercariae ( larval tail ) free. This escape into the water and pierce the skin of a fish. In its muscles they form Metacercarialcysten. By eating uncooked fish, the man can infect. The metacercariae penetrate the intestine and migrate to the liver. There they will stay in the biliary tract and mature into adult flukes. After three to four weeks, the worm begins to lay eggs that pass via the bile into the chair.
Disease
The infestation of humans with Clonorchis sinensis is called Clonorchiose. Despite their lack of awareness they considered the world's third most common parasitic disease. It is a risk factor for the development of cholangiocarcinoma.