Epidemiological characteristics of 14 clusters and outbreaks of Norovirus infection in Nan’an District of Chongqing in 2018

Abstract

Objective To analyze of epidemiological and etiological characteristics of 14 norovirus clusters or outbreak in Nan’an District, for comprehensive prevention and control measures for norovirus infections in the region.

Methods Data were collected from the emergency public health event management information system of China Disease Prevention and Control Information System, and were analyzed by using descriptive epidemiological method.

Results In 2018, 14 cases of norovirus infection clusters and outbreaks were reported in Nan’an District, accounting for 63.64% of the total number of incidents in the region. A total of 268 cases were reported, with an average incidence of 2.19%; the outbreak occurred mainly in November ( n = 6); kindergartens reported the most outbreak ( n = 7), followed by primary schools ( n = 5); the median duration of the outbreak was 2.80 days; and 14 outbreaks were caused by the GII–type genome of norovirus, with the main transmission routes being human-to-hnuman transmission.

Conclusion The prevalence of norovirus outbreaks tends to be higher in schools, it is necessary to strengthen the monitoring of vomiting and diarrhea symptoms in collective units such as schools, and efforts should be promoted for implementation of all levels of prevention and control measures in school.

Abstract

【摘要】 目的 分析南岸区 14 起诺如病毒感染聚集及暴发疫情流行病学及病原学特征, 为探索诺如病毒感染疫情综合 防控措施提供依据。 方法 从中国疾病预防控制信息系统中“突发公共卫生事件管理信息系统”内收集资料, 采用描述流 行病学方法对资料进行统计分析。 结果 2018 年重庆市南岸区累计报告诺如病毒感染聚集及暴发疫情 14 起, 占全区事 件发生总数的 63.64%。累计报告发病 268 例, 平均罹患率为 2.19%; 疫情发生时间主要在 11 月份 (6 起); 幼儿园报告疫情 起数最多 (7 起), 其次是小学 (5 起); 疫情持续时间中位数为 2.80 d; 14 起疫情均由诺如病毒 G II 型基因组引起, 传播途径 主要以人传人为主。 结论 学校是诺如病毒疫情发生高发场所, 需加强学校等集体单位呕吐、腹泻症状监测, 督促学校积极落实各项防控措施。