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为贯彻《学校卫生工作条例》，掌握常见病的动态，提供一定的防治科学依据，我站于1991年11月用加藤厚徐片法对城乡4所中小学生进行粪检。结果共检查1637名学生，查见蛔虫感染者819例，其感染率为50％。男、女学生感染率分别为51．4％（525／1021）和47．1％（294/616）。经X2?
In order to carry out the “Regulations on School Health,” master the dynamics of common diseases, and provide some scientific basis for prevention and treatment, I stood in November 1991 with Kato Kato Tsui film method for urban and rural primary and secondary students for fecal examination. Results A total of 1637 students were examined. Among the 819 cases of roundworm infection, the infection rate was 50%. The prevalence rates of male and female students were 51.4% (525/1021) and 47.1% (294/616) respectively. The X2?