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目的 观察输入钉螺在非疫区的扩散及分布情况,为制定钉螺监测技术方案提供科学依据.方法 2008年3月在清新县1块荒地人工输入1 600只钉螺,5-12月逐月观察该荒地有螺框率、活螺密度、钉螺扩散距离等.结果 晴天与阴雨天有螺框出现率分别为22.88%和29.24%,两者差异有统计学意义(χ~2=4.113,P=0.043);荒地和水沟边/底有螺框出现率分别为9.38%和35.99%,两者差异有统计学意义(χ~2=67.246,P<0.001).晴天和阴雨天活螺平均密度分别为0.79只/0.1 m~2和1.11只/0.1 m~2,荒地和水沟边/底分别为0.11只/0.1 m~2和1.34只/0.1 m~2.输入钉螺的单向扩散距离最远为4.5 m.结论 输入钉螺在阴雨天查出概率较高,其主要分布于水沟边/底等水分充足的地方,以沿水沟边扩散为主.“,”Objecitve To observe the diffusion and distribution of imported Oncomdania snails in non-endemic areas of schistosomiasis.so as to provide scientific basis for developing the scheme of snail surveillance.Methods Oncomelania snails from the msrshland of Dongting Lake were imported in a waste land in March,2008,Qingxin County,which belonged to non-endemic areas of schistosomiasis.and their diffusion and distribution condition were observed from May to December in the same year.Resuits A total of 1 600 Oncomelania snails were imported.The occurrence rate of frame with snails in sunny days and cloudy rainy days were22.88%and 29.24%,respectively,and there was a statistically significant difference between them(χ~2=4.113,P=0.043).Those in waste Land and the sides/bottoms of the ditches were 9.38%and 35.99%,respectively,and the difference between them also showed a statistical significance(χ~2=67.246,P<0.001).The average density of living snails in sunny days and cloudy rainy days were 0.79 and 1.11 No./0.1 m~2,respectively,and those in waste land and the sides/bottoms of the ditches were0.11 and 1.34 No./0.1 m~2.The furthest diffusion distance of snailswas 4.5 m.Conclusions The detective opportunity of imported snails is relatively high in cloudy rainy days,which mainly distribute at the sides/bottoms of ditches and diffuse along the ditches.