浙江省某农家乐一起诺如病毒致胃肠炎暴发疫情分析

An outbreak investigation of gastroenteritis caused by norovirus in an agritainment in Zhejiang Province

目的调查浙江省某乡农家乐食源性胃肠炎暴发疫情,分析其原因和传播途径,为此类事件的预防措施提供依据。方法接报后,对现场开展流行病学和卫生学调查,对病例和从业人员生物学标本、环境标本、饮用水进行实验室检测。结果本次事件中共有临床诊断病例14例,罹患率为21.8%,症状以腹泻(100.00%)、恶心(71.43%)、呕吐(57.14%)为主。实验室确诊病例12例,现场采集病例样本14份、饮用水样本8份和环境样本2份,其中从12份病例肛拭子样本以及客房用水、厨房用水和井水样本中检测出诺如病毒,分型为GⅠ型、GⅡ型、GⅠ和GⅡ混合型,且市政统一供水中未检出致病菌与诺如病毒。结论本次事件为诺如病毒感染引起的胃肠炎暴发疫情,原因是农家乐使用未消毒的井水,并应加强餐饮服务者的卫生知识,尤其用水安全知识,严格落实卫生制度,避免此类事故再次发生。

Objective To investigate the outbreak of foodborne gastroenteritis in an agritainment in a township in Zhejiang Province,analyze its causes and transmission routes,and provide evidence for preventive measures for such incidents.Methods After receiving the report,epidemiological and hygienic investigations were conducted on the site,and laboratory tests were also conducted on biological specimens,environmental specimens and drinking water of cases and practitioners.Results There were 14 clinically diagnosed cases in this event,with an attack rate of 21.8%.The symptoms were mainly diarrhea(100.00%),nausea(71.43%),and vomiting(57.14%).There were 12 laboratory-confirmed cases,14 case samples,8 drinking water samples and 2 environmental samples collected on site.Norovirus was detected from 12 cases of anal swab samples,guest room water,kitchen water and well water samples,classified as GⅠtype,GⅡtype,GⅠand GⅡmixed type,and no pathogenic bacteria and norovirus were detected in the municipal unified water supply.Conclusion This incident is an outbreak of gastroenteritis caused by norovirus infection.The reason is that the farmhouse uses unsterilized well water,and the catering staff should strengthen the hygiene knowledge,especially the knowledge of water safety,and strictly implement the hygiene system to avoid such accidents recurrence.