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钉螺是血吸虫的惟一中间宿主,血吸虫病的流行除了必需存在带有虫卵的粪便污染水源、尾呦存在的水体以及人、畜接触疫水等传播途径外,必需要有中间宿主钉螺的存在。在没有钉螺存在的地区,虽然也有来自血吸虫病流行区的血吸虫病人,但不会形成血吸虫病的流行。
Snail is the only intermediate host of schistosomiasis, schistosomiasis epidemic in addition to the presence of contaminated water with manure contaminated eggs, the existence of the end of Yo body of water and humans, livestock contact with water and other means of transmission, the need for the presence of intermediate host snail. In areas where there is no snail, there is no prevalence of schistosomiasis, although there are also schistosomiasis patients from endemic areas of schistosomiasis.