一起副溶血性弧菌食物中毒调查分析

Investigation on a food poisoning caused by Vibrio parahaemolyticus

目的查明本次食物中毒事件的发生原因和可疑危险因素来源。方法通过流行病学曲线查找可疑餐次,对可疑餐次食物开展病例对照研究,分析食用不同食物及食用不同剂量食物与食物中毒的关联性,并采集可疑食物和病例等标本进行实验室检测。结果共发现61例病例,症状主要为腹痛(98%)、腹泻(90%)、恶心(54%)等。食用白切鸡是发病危险因素(OR=9.25,95%CI:1.14～200.07),且与食物中毒几率呈剂量反应关系(χ2=25.71,P<0.01),厨师在对白切鸡切块过程中穿插处理罗非鱼是导致发生交叉污染的主要原因。病例肛拭子检测为副溶血性弧菌阳性,脉冲场凝胶电泳(PFGE)检测结果同源性为100%。结论食用被副溶血性弧菌污染的白切鸡是导致本次食物中毒的主要原因,建议加强对餐饮机构厨师的监督管理,提高卫生安全意识,防止类似事件再次发生。

Objective To investigate the reason of a food poisoning case,and the origins of the suspicious factors of this case.Methods Find out the suspicious meal according to the epidemiological curve.Then evaluate the foods in the suspicious meal through case-control study,and analyze the correlations between different foods and different dozes.Foods and case samples were collected for laboratory testing.Results 61 cases were founded and the major symptoms were abdominal pains(98%),diarrhea(90%),nauseous(54%) and so on.Eating plain chicken was the risk factor(OR=9.25,95%CI∶1.14-200.07),and showed a dose-effect relation(χ2 test for trends: 25.71,P<0.01).The main reason for cross contamination was that the chef processed the plain chicken and Tilapia at the same time.Vibrio parahaemolyticus was detected in the anus swab samples from patients,the result of PFGE showed 100% homology.Conclusion The food poisoning was caused by plain chicken contaminated by Vibrio parahemolyticus.It is necessary to strengthen the supervision and administration of catering distribution,and improve health consciousness of the public to prevent such case.