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我们于1987年2月至6月随机抽取城郊中小学各一所学生761人(城区330人,郊区431人)粪检结果,蛔虫阳性率为50.6％,城区学生较低(27.6％,郊区学生较高(70.8％)。服驱蛔药后10至30天复查366名阳性学生中有325
From February to June 1987, we randomly selected 761 students (330 in suburbs and 431 in suburbs) of stool tests in suburban primary and secondary schools. The positive rate of roundworms was 50.6% and that of urban students was low (27.6%). Suburban students (70.8%). After 10 to 30 days of taking roundworm medicine, 325 of the 366 positive students were reviewed