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目的了解甲肝暴发的流行病学相关情况。方法做病例对照研究,根据病例定义设计流行病学调查表,将调查结果用EPIDATA软件建立数据库,并用SPSS13.0进行分析,率间比较采用χ2检验。结果此次事件推断为点源暴露;使用1号井的RR值为2.94;停用井水后,经过一个最长潜伏期无病例发生。结论此次疫情发生是由于1号水井污染导致甲肝疫情的出现。
Objective To understand the epidemiological situation of hepatitis A outbreak. Methods A case-control study was conducted. The epidemiological questionnaire was designed according to the case definition. The database was established by EPIDATA software and analyzed by SPSS13.0. Results The incident was inferred as a point source exposure. The RR of No. 1 well was 2.94. After stopping the well water, no case occurred after a longest incubation period. Conclusion The outbreak was caused by the pollution of No.1 well leading to the outbreak of hepatitis A.