于１９８９年３－６月，在四川达县地区城乡选择有代表性的５所中、小学，用方口圆底盒饱和盐水漂浮法检查肠道寄生线虫，共粪检３９６９人，其肠道线虫感染率为５６．８％，城市和乡村学生的感染率分别为５６．８％（１０９４／２５６０）和８２．３％（１１５９／１４０... From March to June 1989, five representative primary and secondary schools in the urban and rural areas of Daxian County in Sichuan Province were selected to inspect intestinal parasitic nematodes using a square-bottomed box saturated saline floatation method. A total of 3969 people were examined for fecal matter. The nematode infection rate was 56.8%, and the infection rates of urban and rural students were 56.8% (1094/2560) and 82.3% (1159/140...