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Schistosomiasis Japonica ; hisory of pain, discovery, termination in Yamanashi prefecture, Japan

This article explains about infectious disease caused by parasite called Schistosoma japonicum, how it distressed many people mainly in Yamanashi prefecture of Japan for many years without knowing the mechanism and how it was exterminated and overcome.

Schistosomiasis japonica (form of bilharzia caused by the Oriental blood fluke Schistosoma japonicum) is caused by parasitism of Schistosoma japonicum on mammals including human beings at inside blood vessels. The worm fests on a pure water conch called "Miyairigai" first,as an inetermidiary, and then a larva (cercaria) penetrate through the skin of a mammal into the body; where the infed host gets inflamation of skin as an initial symptom, and then it is attacked by high fever and/or digestiive inperfection. Later, the imago grown up and reside within liver portal vein start to lay eggs and reproduce itself until the speces become enorrmousely large in number; the body gets seriously damaged when cirrhosis of the liver occurres and jaundice and fluid in the abdominal cavity and finally dies.

日本住血吸虫症とは住血吸虫科に分類される寄生虫である日本住血吸虫（にほんじゅうけつきゅうちゅう）の寄生によって発症する寄生虫病であり、ヒトを含む哺乳類全般の血管内部に寄生感染する人獣共通感染症でもある[3]. 日本住血吸虫はミヤイリガイ（宮入貝、別名カタヤマガイ）という淡水産巻貝を中間宿主とし、河水に入った哺乳類の皮膚より吸虫の幼虫（セルカリア）が寄生、寄生された宿主は皮膚炎を初発症状として高熱や消化器症状といった急性症状を呈した後に、成虫へと成長した吸虫が肝門脈内部に巣食い慢性化、成虫は宿主の血管内部で生殖産卵を行い、多数寄生して重症化すると肝硬変による黄疸や腹水を発症し、最終的に死に至る.