（日本血吸虫）1. Schistosoma japonicumIt is prevalent in Far East.In china, it is prevalent in Yangtze valley and south of Yangtzeexcept Guizhou Province.The adults live in the portal vein system, causing liver cirrhosis（肝硬化）and portal veinhypertension syndrome（门脉高压征候群）
1. Schistosoma japonicum（日本血吸虫） It is prevalent in Far East. In china, it is prevalent in Yangtze valley and south of Yangtze except Guizhou Province. The adults live in the portal vein system, causing liver cirrhosis （肝硬化）and portal vein hypertension syndrome（门脉高压 征候群）
2. Schistosoma mansoni（曼氏血吸虫）is distributed in Africa and focal area in LatinAmericaLives in the portal and hemorrhoidal vein plexus, causing stoolwith fresh blood, liver cirrhosis and portal vein hypertension
2. Schistosoma mansoni（曼氏血吸虫） is distributed in Africa and focal area in Latin America. Lives in the portal and hemorrhoidal vein plexus, causing stool with fresh blood, liver cirrhosis and portal vein hypertension
3.Schistosoma haematobium（埃及血吸虫）widely spreads in Africa, chiefly in Nile River valleyThe adults live in the vesical and pelvic plexus causingrenalfailureterminalpainlesshaemuresis,complicated by the ureter obstruction
3. Schistosoma haematobium（埃及血吸虫） widely spreads in Africa, chiefly in Nile River valley. The adults live in the vesical and pelvic plexus causing painless terminal haemuresis, renal failure complicated by the ureter obstruction
4.Schistosoma mekongi (湄公血吸虫)It is merely distributed in Mekong River ValleyjaponicumresemblesSchitosomaexceptintermediate host
4. Schistosoma mekongi (湄公血吸虫) It is merely distributed in Mekong River Valley, resembles Schitosoma japonicum except intermediate host
GeographicDistribution of SchistosomiasisAffected CountriesS.haematobiumS.japonicumS.mansoniS.mansoniandS.haematobiumNone4000040008000MilesRegenatDistibutionofSebistoremiasis10RegionCountriea AffecteSouthAnefesINorthem AfricaSouth America3outhernArics9NorthernAfricaWelternAtic19SouthernAfricaCaribbean17Western AfricaMidtieEant6Carsbbean9Middie EastCounpries Anested