浙江省流动人口血吸虫感染情况抽样调查及分析

Sampling survey on the prevalence of schistosomiasis among floating population in Zhejiang province

目的了解浙江省流动人口血吸虫感染情况，为制订血吸虫病防治策略提供科学依据。方法采用分层整群随机抽样法抽取19个县129个村，各调查县收集流动人口基本信息，调查来自血吸虫病疫情未控制县和疫情回升县人口与流动人口的构成比。各调查村抽取来自上述疫区人群中6～65岁流动人口100人，进行问卷调查和间接红细胞凝集试验（IHA）检查。IHA阳性者再以尼龙绢集卵孵化结合沉渣镜检法检查粪便。采用SPSS13．0统计软件对调查数据进行处理和分析。结果共收集流动人群信息3357420人，其中来自疫情未控制和疫情回升县人数303219人，占9．03％。IHA检查13898人，阳性率为2．06％（286／13898）。对276例血清学阳性者进行粪检，查出病原学阳性者7例，阳性率为2．52％（7／276）。根据来自疫区流动人群构成比及血清学、病原学调查结果推算血吸虫病血清学阳性人数约为3．35万人，病原学阳性人数约为845人。结论浙江省有血吸虫病患者输入，存在m吸虫病重新传播流行威胁。

Objective To survey on the prevalence of schistosomiasis among floating population in Zhejiang province. Methods A survey on prevalence of schistosomiasis among floating population was conducted from September to November 2008, and the stratified cluster sampling method was adopted in the survey. Totally 129 villages of 19 counties or districts were selected as survey sites, and 100 samples of migrants aged 6 to 65 from schistosomiasis-endemic areas were taken in each selected village. All selected individuals were surveyed by questionnaire and underwent serum indirect hemagglutination （IHA） test. For individuals with positive serum IHA testing the fecal examination was carried out to detect the eggs by nylon sedimentation method. SPSS 13.0 software was used for data processing. Results The number of migrants in survey sites was 3 357 420, among whom 303 219 were from schistosomiasis-endemic areas （9.03%）. The positive rate in serum IHA test was 2.06% （286/13 898） , 276 IHA-positives individuals received fecal exainination, and 7 cases were positive （2.52%）. Based on above data it was estimated that there would be potentially about 33 500 serum IHA-positive cases and 845 egg-positive cases among floating population in Zhejiang province. Conclusion The risk of schistosomiasis transmission still exists in Zhejiang province due to the infected migrants fi＇om endemic areas, and a surveillance system and quick response are required for prevention of re-emergence of the disease.