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甲型肝炎（以下简称甲肝巧匠几年来在我市中小学生中的发病率持续高干其他人群。为采取针对性措施保护这一群体，我们于1993年6月至1994年5月在市区对甲肝流行因素进行了1：2病例对照调查，现将结果报告如下。1对象与方法11对象选择云龙区、鼓楼区及泉山区为调查点，调查点内19
Hepatitis A (hereinafter referred to as Hepatitis A for many years in our city primary and secondary school students continue to high incidence of other groups .In order to take targeted measures to protect this group, we in June 1993 to May 1994 in downtown Hepatitis A epidemic factors were 1: 2 case-control survey, the results are reported as follows.1 objects and methods 11 object selection Yunlong District, Drum Tower District and Quanshan District as a survey point, the survey point 19