1998年长江流域发生特大洪涝灾害。为了解灾区人群甲型肝炎 (以下简称甲肝 )抗体水平 ,根据要求 ,1999年 1月中旬对 4个重灾区乡镇 1193人 ,进行甲肝抗体水平检测和调查。1　对象与方法1.1　对象　选择沿长江和皖河水系的江镇、洪铺、海口、山口 4个重灾区乡镇 ,按不同年龄组和 In 1998, there were serious floods in the Yangtze River basin. In order to understand the antibody level of hepatitis A (hereinafter referred to as hepatitis A) in disaster-stricken areas, according to the requirements, in mid-January of 1999, 1193 people in 4 hardest hit townships were tested and investigated for the antibody level of hepatitis A. 1 Subjects and methods 1.1 Object selection Along the Yangtze River and the Anhui River water Jiangzhen, Hongpu, Haikou, Yamaguchi four hardest hit towns, according to different age groups and