重庆市某区一起肠炎沙门菌引起的食源性疾病暴发事件调查分析

Investigation and analysis of an outbreak of foodborne disease caused by Salmonella enteritidisin a district of Chongqing

目的对一起因食用被肠炎沙门菌污染面包引起的食源性疾病暴发事件进行调查分析,为今后处置类似事件提供依据。方法利用描述性流行病学方法分析病例的临床特征、流行病学分布及相关危险因素,开展回顾性队列研究确定病因食品,采集病例和食堂从业人员生物标本、剩余食品和环境样品进行实验室检验,结合卫生学调查情况,综合分析暴发事件的发生原因。结果回顾性队列研究显示2021年5月20日重庆市某食品厂生产的某批次预包装面包为可疑食物,在食用该批次面包的73人中,有55人发病,患病率为75.34%,潜伏期中位数为15 h,同时,在剩余食品、相关环境样品、病人肛拭子中均检出肠炎沙门菌。结论本次事件是一起因进食受肠炎沙门菌污染的面包导致的食源性疾病暴发事件。

Objective To provide the basis for dealing with similar incidents in the future,an outbreak of foodborne illness caused by the consumption of bread contaminated with Salmonella enteritidis was investigated.Methods Descriptive epidemiological methods were used to analyze the clinical characteristics,epidemiological distribution and related risk factors of the cases.The etiological food was determined by retrospective cohort study.The biological samples,food remains and environmental samples of the cases and canteen employees were detected by laboratory testing.The causes of the outbreak were comprehensively analyzed based on the results of epidemiological investigation,laboratory tests and sanitary investigation.Results Retrospective cohort study showed that a batch of pre-packaged bread produced by a food factory in Chongqing on May 20,2021 was the suspicious food.A total of 73 people ate the suspicious bread in this incident,and 55 of them got ill with a morbidity rate of 75.34%and a median incubation period of 15 h.At the same time,Salmonella enteritidis was detected in food remains,related environmental samples and anal swabs of patients.Conclusion The incident was an outbreak of foodborne disease caused by bread contaminated with Salmonella enteritidis.