永胜县血吸虫病流行病学抽样调查工作报告

目的：准确掌握永胜县血吸虫病流行现状，为制订血吸虫病防治策略提供依据。方法：用分层随机抽样法确定调查点。用尼龙袋集卵孵化法、顶管孵化法分别对人畜进行查病，用系统抽样结合环境抽样法开展螺情调查。结果：人群感染率为3．74％；家畜感染率为1．59％；活螺平均密度为3．5只／框，钉螺自然感染率为0．026％，感染螺平均密为0．0009只／框。结论：重度流行区疫情有了大幅度的下降，轻度流行区的疫情有一定的反弹。

Sampling Survey Repirt of Schistosomiasis Epidemiology in Yongsheng County

Objective: To well know the present situstion of schistosomiasis epidemic trend to supply evidence for taking measures to prevent schistosomiasis in Yongsheng County. Methods: Using stratified sampling method to determine the survey places, The schistosomiasis in people and livestock were surveyed by the methods of nylon bag incubation and top - tube incubation. Using systematic sampling combined with community field trial to survey snail distribution.Results:The infection rate in population was 3.74% and livestock was 1.59% ,the average density of living snail was 3.5 per frame, the natural infection rate of snail was 0.026% , the density of infectious snail was 0.009 per frame. Conclusion: The epidemic situation in heavy epidemic regions have lessened markedly, while the epidemic situation in mild epidemic regions have rebounded.