旌德县俞村中学于 2 0 0 2年 2至 3月发生一起甲肝爆发流行。全校 774名学生 ,发病 5 4人 ,罹患率为6 .98% ,病例分布在全校 14个班级。现将调查情况报告如下 :1　材料与方法1.1　资料来源　来自俞村乡卫生院传染病报告卡和个体医生门诊登记记录。1.2　方法　逐例填写个案调查 Jingde County Yucun secondary school from February to March 2002 a hepatitis A pandemic. The school 774 students, the incidence of 5 4 people, the attack rate was 6 .98%, the case distribution in the school 14 classes. Now the investigation report as follows: 1 Materials and methods 1.1 Source of information Yu village health center infectious disease report card and individual doctor clinic registration records. 1.2 Methods Case by case fill in the investigation