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青岛市城阳区卫生防疫站李志智周遵伟刘先菊家庭是社会的基本组成单元，研究疾病的家庭聚集性分布可以提高对疾病的防治效果。因此，我们于1997年5月对我市城阳区小学生蛔虫感染的家庭聚集性分布进行了调查分析。现将结果报告如下。1对象与方法1．1对象采用随机抽样的方法选取?
Chengyang District Health and Epidemic Prevention Station of Qingdao City Zhi-Zhi Li ZHOU Zun-wei Liu Xianju Family is the basic unit of society, the study of the distribution of disease family aggregation can improve the prevention and treatment of diseases. Therefore, in May 1997, we conducted a survey and analysis of the clustered distribution of ascaris infection in primary school students in Chengyang District of our city. The results reported below. 1 objects and methods 1.1 object selected by random sampling method?