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目的通过调查由1起聚餐引起的以发热、腹痛、腹泻为主要症状的聚集性疫情,查找传染源和传播方式,为今后类似疫情提供防控依据。方法制定统一病例定义,开展病例主动搜索,对就餐人员就餐情况开展回顾性队列研究,采集标本进行实验室检测。结果共发生44例病例,疑似病例12例,临床诊断病例26例,实验室诊断病例6例,其中43例为参加宴席病例,罹患率86.0%(43/50),1名餐馆从业人员发病。从病例标本(粪便或肛拭子)分离到6株韦太夫雷登沙门菌,从鸡场污水排放口中分离到1株韦太夫雷登沙门菌,7株沙门菌PFGE鉴定结果显示为同一型别。对5月27日就餐的51例就餐者开展回顾性队列研究。结果显示5月27日中午的凉菜为危险因素。结论该起疫情为宴席中使用的鸡肉受韦太夫雷登沙门菌污染所致,污染来源可能来自制作的凉拌鸡的鸡肉。
Objective To investigate the sources of infection and modes of transmission by investigating the aggregated outbreaks of fever, abdominal pain and diarrhea caused by one meal together to provide a basis for prevention and control of similar outbreaks in the future. Methods A unified case definition was developed, cases were actively searched, and a retrospective cohort study was conducted on the eating habits of dining staff. Specimens were collected for laboratory testing. Results There were 44 cases, 12 cases suspected, 26 cases clinically diagnosed and 6 cases diagnosed in laboratory. Among them, 43 cases were attending feast cases with attack rate of 86.0% (43/50) and 1 restaurant practitioner. Six strains of Salmonella vetovadenis were isolated from the specimens (feces or anal swabs), and one strain of Salmonella typhimurium was isolated from the wastewater discharge port of the farm. The results of PFGE identification of the seven Salmonella strains showed the same type . Retrospective cohort study of 51 diners dining on May 27. The result showed that the cold dish at noon on May 27 was a risk factor. CONCLUSIONS The chicken used in the feast was contaminated with Salmonella Wetterweiden by sources of contamination, probably from the chicken meat produced in cold chicken.