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肠道蛔虫感染是中小学生，特别是农村中小学生普遍存在的健康问题，据调查北京市1980年城乡中小学生蛔虫感染率为24．96％～46．05％。为落实国家制定的防治目标，我市于1992年开展了肠道蠕虫监测工作。1调查对象与方法1．1调查对象：采用二级分层整群随机抽样的方法。北京作为
Intestinal Ascaris infection is a common health problems among primary and secondary school students, especially primary and secondary school students in rural areas. According to the survey, the prevalence of Ascaris infection among primary and secondary school students in urban and rural areas in 1980 was 24.96% -46.05%. In order to implement the prevention and control targets set by the state, the municipality carried out monitoring of intestinal worms in 1992. A survey of objects and methods 1.1 Survey: a two-tier stratified cluster random sampling method. Beijing as