AN INTRODUCTION OF A NATIONWIDE SAMPLING SURVEY ON SCHISTOSOMIASIS IN CHINA

目的：为了解血吸虫病流行现状和评价１９９０－１９９５年的血吸虫病防治效果，于１９９５年９－１１月开展了全国血吸虫病流行病学调查。方法：采用分层整群随机抽样法进行调查。在未控制流行地区，对居民血吸虫感染，采用尼龙绢袋集卵孵化法和改良加藤法检查粪便，对耕牛等家畜，采用尼龙绢袋集卵孵化法检查粪便。同时，对部分居民询检症状、体征；并调查晚期血吸虫病。在已控制流行地区，先以环卵沉淀试验或间接血凝试验检查初筛，阳性者再以尼龙绢袋集卵孵化法和改良加藤法粪检。结果：在未控制流行地区，样本村１９５个，检查２２４８１９人，居民粪检阳性率为４．９％，耕牛粪检阳性率为９．０６％。在已控制流行县中，样本村１６９个，检查１８３０２人，在湖北和四川两省查出粪检阳性者１７例。推算感染者为８６５０８４例，推算病牛为１００２５１头。结论：推算感染者例数较１９８９年的下降４７．２％，病牛头数约５０％。

AN INTRODUCTION OF A NATIONWIDE SAMPLING SURVEY ON SCHISTOSOMIASIS IN CHINA

AIM: In order to know the present status of the endemicity of schistosomiasis and to evaluate the control effect during 1990-1995, a second nationwide sampling survey on schistosomiasis japonica was undertaken during September and November of 1995. METHODS: A stratifying and clustering random sampling technique was used in the survey. Serological test, circumoval precipitin test or indirect hemagglutination assay were used for preliminary screening. Stool examination using hatching technique and Kato Katz technique was applied for identification of the infected persons and intensity of infection and hatching test only for survey of domestic animals. RESULTS: In 195 sampled villages from endemic areas, a total of 224 819 people were examined. The infection rate of residents was 4 89% and the infection rate of farm cattle was 9 06%. In the 169 sampled villages from endemic areas under control, only 17 out of 18 302 children were identified as infected by stool examination from Hubei and Sichuan Provinces. From the results of the survey, the number of infected persons, and the number of infected farm cattle and water buffaloes were estimated to be 865 084 and 100 251, respectively, in the whole country. CONCLUSION: As compared with the data in 1989 , a reduction of 47 2% in infected persons and about 50% in infected farm cattle and water buffaloes, respectively, was shown.