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目的通过对一起诺如病毒感染性胃肠炎疫情调查处置,了解疫情发生发展特点,分析引起暴发的危险因素,为针对性防控措施提供依据。方法采用描述性流行病学和回顾性队列分析疫情流行病学特征、传播方式及危险因素;对学校教室、食堂、饮水等开展卫生学调查,标本送实验室采用RT-PCR方法检测诺如病毒。结果本次疫情共有病例20例,均发生在六(2)班,其中1例为该班班主任,班级学生罹患率为40.43%;主要临床症状为发热、恶心、呕吐,吃寿司是本次疫情危险因素,采集6份粪便/肛拭子标本检测,4份标本诺如病毒GⅡ.4 Sydney-2012变异毒株阳性。结论本次疫情为一起由GⅡ.4 Sydney-2012变异毒株诺如病毒引起的胃肠炎爆发疫情,吃寿司可能是本次疫情的危险因素。
Objective To investigate the epidemic situation of Norovirus Infectious Gastroenteritis, investigate the characteristics of epidemic situation, analyze the risk factors of outbreak and provide basis for targeted prevention and control measures. Methods Descriptive epidemiology and retrospective cohort analysis of epidemiological characteristics, methods of transmission and risk factors; hygiene studies were conducted in classrooms, canteens, drinking water, etc. Specimens were sent to laboratories for RT-PCR to detect norovirus . Results A total of 20 cases of this outbreak occurred in six (2) classes, of which 1 was the class teacher, the attack rate of class students was 40.43%; the main clinical symptoms were fever, nausea and vomiting, eating sushi was the outbreak Six fecal / anal swab specimens were collected for detection of the risk factors, and four specimens of Norovirus GII.4 Sydney-2012 mutants were positive. Conclusions The outbreak was an outbreak of gastroenteritis caused by GⅡ.4 Sydney-2012 variant virus Norovirus. Edible sushi may be the risk factor for this outbreak.