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目的调查一起聚集性胃肠炎事件暴发的病源、传播途径及危险因素,为有效控制疫情提供依据,为减少同类事件提供经验。方法制订病例定义并搜索,采取病例对照方法寻找可疑餐次及危险食物,采集样品进行核酸检测和分离培养。结果共搜索到疑似病例60例,确诊24例,流行曲线提示为点源暴露,2014年11月24日午餐是可疑餐次,该午餐中的客家秘制烧鸭是危险食物,邻座或共用工作卡座通道存在的接触是疫情扩散的因素,24例患者肛拭子标本经PCR检测,为诺如病毒核酸阳性,经鉴定为GⅡ.17型病毒株。结论该次疫情是一起GⅡ.17型诺如病毒导致的感染性胃肠炎暴发。
Objective To investigate the pathogen, route of transmission and risk factors of an outbreak of gastroenteritis, provide basis for effective control of epidemic situation and provide experience for reducing similar incidents. Methods Define and search case definitions, take case-control method to find suspicious meals and dangerous food, collect samples for nucleic acid detection and isolation and culture. Results A total of 60 suspected cases were searched and 24 cases were diagnosed. The epidemic curve suggested a point source exposure. Lunch was a suspicious meal on November 24, 2014. Hakka secret roasted duck was a dangerous food, The contact of working card channel was the factor of epidemic spread. 24 samples of anal swab were detected by PCR and were Norovirus positive, which was identified as GII.17 strain. Conclusion The outbreak was an outbreak of infectious gastroenteritis caused by GⅡ.17 Norovirus.