1991年10月,辽阳市灯塔县铧子新生水泥厂子弟小学校发生了一起经饮用自来水传播的甲型肝炎暴发流行,报道如下。1991年10月初,新生水泥厂子弟小学校的各年级学生中出现了以食欲减退、恶心、呕吐、厌油以及巩膜黄染、肝大肋下>1.0cm等症状的病人,10月6～15日有118人发病,至10月31日流行平息。总计发病 In 1991 October, Liaoyang City, Lantau County, son of newborn cement factory children’s primary school occurred with drinking water spread hepatitis A outbreak, reported as follows. In early October 1991, students of all grades in the primary school of Xinsheng Cement Factory appeared in patients with symptoms such as loss of appetite, nausea, vomiting, greasy oil, and scleral yellowish stool with> 1.0cm in the large rib cage. From October 6 to October 15 There are 118 cases of onset, to October 31 epidemic subsided. Total incidence