(精选)【医学课件课件大全】 人体血吸虫教学课件.ppt

Human Schistosome (人体血吸虫);Kingdom: AnimaliaPhylum: PlatyhelminthesClass: TrematodaSubclass: DigeneaOrder: StringeiformesGenus: SchistosomaSpecies: Schistosoma haematobium, S. japonicum, S. mansoni and S. intercalatum;/Schistosomiasis/Default.htm;Schistosome: A parasitic trematode worm contracted from infested water that is capable of causing liver, gastrointestinal tract and bladder disease. There are three main species of these trematode worms (flukes) -- Schistosoma haematobium, Schistosoma japonicum, Schistosoma mansoni and S. intercalatum that produce disease in humans. ;Endemic in 74 developing countries with more than 80% of infected people living in sub-Saharan Africa. S. haematobium is the most prevalent and widespread species in Africa and the Middle East S. intercalatum occurs in 10 countries in the rainforest belt of Africa S. mansoni is found in Africa and is the only species seen in Latin America S. japonicum is restricted to the Pacific region including China and the Philippines S. mekongi is found in limited areas of Laos and Cambodia. ? ;S.japonicum, S.haematobium, S.mansoni, S.intercalatum, S. mekongi ;;Human Schistosomes: S.japonicum(日本血吸虫) S. mansoni(曼氏血吸虫) S. haematobium(埃及血吸虫) S.mekongi(湄公血吸虫);Morphology Life cycle Pathogenesis clinical manifestation Diagnosis Epidemiology Prevention control ;Schistosome: causative agent of schistosomiasis Life cycle: adult worm, egg, larvae ( miracidia , sporocysts ,cercariae ), schistosomula Definitive host: human Intermediate host :snail The rount of the infection: cercariae penetrating an individuals unbroken skin while contacting infested water with cercariae Parasitized site: The adult worms live in the blood vessels Eggs: egg-granuloma ;Life cycle adult worm egg Miracidium sporocyst (mother and daughter sporocyst) Cercariae schistosomula ; ????????????????????????????????????? ;Dimorphism(雌雄异体）copulation(合抱）;Life cycle For example