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目的对北京市顺义区某幼儿园发生的一起以呕吐为主要症状的急性胃肠炎暴发疫情开展调查,为处理类似事件提供依据。方法开展现场流行病学调查,对可疑食物和病例样本进行实验室检测,分析传染途径和传染源。结果该事件共报告病例20例,罹患率9.52%(20/210),流行曲线提示为人传人模式。采集的27份标本经检测,诺如病毒GⅡ型阳性9份,阳性标本经序列测序分析为诺如病毒GⅡ.7型。疫情发展与未及时发现并隔离首例病例有关,接触病例、病例呕吐物及其污染物是导致此次暴发疫情的主要危险因素。结论这是一起由诺如病毒GⅡ.7引起的急性胃肠炎暴发疫情,应加强学校传染病防治知识宣传。
Objective To investigate the outbreak of acute gastroenteritis with vomiting as the main symptom in a kindergarten in Shunyi District, Beijing, and provide a basis for handling similar incidents. Methods To carry out on-site epidemiological investigation, to carry out laboratory tests on suspicious food and case samples, and to analyze the route of infection and source of infection. Results The incident reported a total of 20 cases of patients, the attack rate of 9.52% (20/210), the pop curve suggests that the pattern of human transmission. Twenty-seven specimens collected were tested, and nine Norovirus positive specimens (GⅡ) were positive. The positive specimens were sequenced and sequenced as Norovirus GⅡ.7. The development of the epidemic was related to the failure to detect and isolate the first cases in a timely manner. The main risk factors for the outbreak were contact cases, vomit cases and their contaminants. Conclusions This is an outbreak of acute gastroenteritis caused by Norovirus GII.7. Knowledge of prevention and treatment of infectious diseases in schools should be strengthened.