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目的对江门市某学校发生的一起聚集性腹泻暴发疫情进行调查和分析。方法采用描述性流行病学和回顾性队列研究的方法,分析发病原因、感染途径及其危险因素;对学校食堂开展现场卫生学调查,采用RT-PCR方法检测诺如病毒核酸。结果疫情从2014年11月20日0时持续至21日16时,共报告87例病例,罹患率0.67%。临床表现较轻,以恶心、呕吐和腹痛为主。病例全部为学生,女生罹患率高于男生。疫情持续40h,发病曲线呈单峰,病例在宿舍、班级空间分布上无集聚性。11份病人肛拭子标本有5份诺如病毒GⅡ型阳性。18、19日在A公司大众早餐部刷卡吃早餐是发病的危险因素。结论本次事件为一起发生在学校的由诺如病毒GⅡ型引起的集聚性感染性腹泻暴发疫情,18、19日在A公司大众早餐部刷卡吃早餐是发病的危险因素,感染途径为食源性。
Objective To investigate and analyze the outbreak of a cluster diarrhea in a school in Jiangmen City. Methods Descriptive epidemiological and retrospective cohort studies were used to analyze the etiological factors, pathways of infection and risk factors. An on-site hygiene survey was conducted on the school cafeteria, and Norovirus nucleic acid was detected by RT-PCR. Results The outbreak ranged from 0:00 on November 20, 2014 to 16:00 on the 21st. A total of 87 cases were reported with an attack rate of 0.67%. Clinical manifestations of mild to nausea, vomiting and abdominal pain based. All cases were students, girls attack rate higher than boys. The epidemic lasted 40h, the incidence curve showed a single peak, the cases in the dormitory, class spatial distribution of non-agglomeration. There were 5 Norovirus G II positive samples in 11 patients with anal swabs. 18, 19 in the A company’s popular breakfast credit card breakfast is a risk factor for the disease. Conclusions This incident was an outbreak of agglomerative infectious diarrhea caused by norovirus GII in school together. Breakfast breakfast was swallowed by A company’s popular breakfast department on the 18th and 19th days, which was the risk factor of infection. The route of infection was food Sex.