Epidemiological characteristics of norovirus outbreaks in Shenzhen during 2005 to 2017

Q4 Immunology and Microbiology

中华微生物学和免疫学杂志 Pub Date : 2019-09-30 DOI:10.3760/CMA.J.ISSN.0254-5101.2019.09.009

Zhen Zhang, Yuan Li, Hailong Zhang, Yan Lu, S. Mei, Jia Du, Xu Xie

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Abstract

Objective To investigate the epidemiological characteristics of norovirus outbreaks in Shenzhen during 2005 to 2017 in order to provide reference for disease control and prevention. Methods Monitoring data of norovirus outbreaks in Shenzhen from January 1, 2005 to December 31, 2017 were collected from Shenzhen Communicable Disease Information System and China Information System for Disease Control and Prevention. Descriptive epidemiological methods were used for data analysis. Results From January 2005 to December 2017, 346 norovirus outbreaks (five or more cases in one community within one week) were reported in Shenzhen, of which 6.36% (22/346) were public health emergency events. Fewer outbreaks were reported during 2006 to 2013 and they were mainly caused by GⅡ.4 genotype, but the number increased sharply since 2014 with 57.80% (200/346) occurred in 2016—2017 and the epidemic genotype changed from GⅡ.4 to GⅡ.17 and GⅡ.2. The outbreaks peaked during November to March (76.88%, 266/346). There were 63.87% (221/346) reported in urban areas, 67.05% (232/346) in nurseries and 23.70% (82/346) in primary/middle schools. Among the 22 public health emergency events, 40.91% (10/22) were caused by person-to-person contacts, 40.91% (10/22) by foodborne transmission and 13.64% (3/22) by waterborne transmission. Moreover, 75.80% (238/314) of the outbreaks in nurseries and primary/middle schools were confined to one classroom and most were due to contact transmission. Conclusions Norovirus outbreaks increased obviously since 2014, which might be related to the changes of the predominant genotype from GⅡ.4 to GⅡ.17 and GⅡ.2. It is necessary to strengthen a comprehensive prevention and control in key units such as nurseries and primary/middle schools in winter and spring. Key words: Norovirus; Outbreak; Public health emergency; Genotype

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2005 - 2017年深圳市诺如病毒疫情流行病学特征

目的了解2005 - 2017年深圳市诺如病毒疫情的流行病学特征，为疾病防控提供参考。方法收集深圳市传染病信息系统和中国疾病预防控制信息系统2005年1月1日至2017年12月31日诺如病毒疫情监测数据。采用描述性流行病学方法进行数据分析。结果2005年1月- 2017年12月，深圳市共报告诺如病毒疫情346起(一周内单个社区5例及以上)，其中突发公共卫生事件占6.36%(22/346)。2006年至2013年期间报告的疫情较少，主要由GⅡ引起。4个基因型，但自2014年以来数量急剧增加，2016-2017年占57.80%(200/346)，流行基因型由GⅡ转变而来。4至GⅡ。17和GⅡ.2。11 ~ 3月为暴发高峰(76.88%，266/346);其中，城区占63.87%(221/346)，托儿所占67.05%(232/346)，中小学占23.70%(82/346)。22起突发公共卫生事件中，人际接触传播占40.91%(10/22)，食源性传播占40.91%(10/22)，水媒传播占13.64%(3/22)。此外，75.80%(238/314)的幼儿园和中小学疫情发生在一个教室内，大多数是由接触传播引起的。结论2014年以来诺如病毒疫情明显增加，可能与GⅡ优势基因型的变化有关。4至GⅡ。17和GⅡ.2。加强幼儿园、中小学等重点单位冬春季综合防控工作。关键词:诺如病毒;爆发;突发公共卫生事件;基因型

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来源期刊

中华微生物学和免疫学杂志 Immunology and Microbiology-Virology

CiteScore

0.50

自引率

0.00%

发文量

6906

期刊介绍： Chinese Journal of Microbiology and Immunology established in 1981. It is one of the series of journal sponsored by Chinese Medical Association. The aim of this journal is to spread and exchange the scientific achievements and practical experience in order to promote the development of medical microbiology and immunology. Its main contents comprise academic thesis, brief reports, reviews, summaries, news of meetings, book reviews and trends of home and abroad in this field. The distinguishing feature of the journal is to give the priority to the reports on the research of basic theory, and take account of the reports on clinical and practical skills.