2004年 7月 26日下午,河南省郑州市上街区疾病控制中心接到疫情报告,本区某游泳馆发生一起以上呼吸道感染症状为主要症状的感染事件,游泳 361人,发病 136人,发病率37 7%, 7月 30日,河南省疾病控制中心专家到上街区进行调查,在排除其它可能的致病因素后,将 7月 27日采集保存 On the afternoon of July 26, 2004, Shangjie District Center for Disease Control and Prevention in Zhengzhou City, Henan Province received an epidemic report. In a certain swimming pool in the district, an infection occurred with symptoms of the above respiratory infections as the main symptom, swimming 361 people, and the incidence was 136. The incidence rate 37 7%, July 30, Henan Center for Disease Control and Prevention experts to the streets to investigate, after excluding other possible pathogenic factors, will be July 27 to save the collection