|
|
Epidemiological characteristics of influenza outbreaks in Zhejiang Province from 2013 to 2022 |
WANG Xuan1, LIU Shelan2, CAO Yanli2, SUN Wanwan2, FENG Yan2, LING Feng2
|
1. Health Science Center, Ningbo University, Ningbo, Zhejiang 315211, China; 2. Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, Zhejiang 310051, China |
|
|
Abstract Objective To investigate the epidemiological characteristics of influenza outbreaks in Zhejiang Province from 2013 to 2022, so as to provide insights into influenza prevention and control. Methods Data pertaining to influenza outbreaks reported in Zhejiang Province from 2013 to 2022 were collected from National Influenza Surveillance System in China, including time, region, cases and pathogen types of influenza outbreaks. The temporal, spatial and pathogen distribution of influenza outbreaks were analyzed using a descriptive epidemiological method. Results A total of 577 influenza outbreaks involving 448 698 individuals were reported in Zhejiang Province from 2013 to 2022, and the overall attack rate was 5.34% (23 974 cases), with no death reported. The lowest attack rate of influenza was 0.26%, and the highest was 80.00%, with a median attack rate of 10.89% (interquartile range, 24.26%). The outbreak had the shortest duration of 1.00 day, and the longest duration of 59.00 days, with a median duration of 9.00 (interquartile range, 11.00) days. There were 387 influenza outbreaks that occurred between November and January of the following year (67.07%), and the three highest numbers of outbreaks were reported in Hangzhou City (310 outbreaks), Wenzhou City (51 outbreaks) and Jinhua City (46 outbreaks). There were 395 outbreaks reported in urban regions (68.46%), 93 in counties and townships (16.12%) and 89 in rural regions (15.42%), and influenza outbreaks predominantly occurred in primary schools (487 outbreaks, 84.40%). In addition, the types of pathogens were alternately prevalent, with influenza B virus (241 outbreaks, 41.77%) and A/H3N2 virus (232 outbreaks, 40.21%) as predominant subtypes. Conclusions Influenza outbreaks mainly occurred in winter in Zhejiang Province from 2013 to 2022, and primary schools were main places of influenza outbreaks, while influenza B virus and A/H3N2 virus were predominant subtypes. It is necessary to reinforce the surveillance and report of influenza-like illness in schools and improve the coverage of influenza vaccination to prevent influenza outbreaks.
|
Received: 18 April 2023
Revised: 05 July 2023
Published: 17 August 2023
|
|
|
|
|
[1] 国家免疫规划技术工作组流感疫苗工作组.中国流感疫苗预防接种技术指南(2021—2022)[J].中华流行病学杂志,2021,42(10):1722-1749. [2] 曾晓旭,谢怡然,陈涛,等.中国2019—2020监测年度流感暴发疫情特征分析[J].国际病毒学杂志,2021,28(5):359-363. [3] 黄维娟,董婕,舒跃龙.中国流感监测网络发展概况[J].疾病监测,2008,23(8):463-469. [4] 余昭,孙琬琬,刘社兰,等.呼吸道传染病监测体系运行状况分析[J].预防医学,2021,33(1):101-103. [5] 中华人民共和国卫生部.流感样病例暴发疫情处置指南(2012年版)[J].传染病信息,2012,25(6):321-323. [6] 叶莹,杨凯朝,范威,等.河南省2017—2019年流感样病例暴发疫情流行病学特征分析[J].现代预防医学,2020,47(19):3465-3467. [7] 中华人民共和国国家卫生健康委员会办公厅,国家中医药管理局办公室.流行性感冒诊疗方案(2019年版)[J].中国病毒病杂志,2020,10(3):164-168. [8] 张云兰,王俊华,罗卫华,等.滨州市法定传染病医疗机构报告数据准确性及影响因素分析[J].中国医院统计,2022,29(6):428-434. [9] 曹达魁,王海琴.2011—2019监测年度全国流感暴发疫情流行病学特征分析[J].实用预防医学,2021,28(9):1098-1100. [10] 王心怡,吴昊澄,鲁琴宝,等.2012—2021年浙江省学校突发公共卫生事件及相关信息分析[J].预防医学,2022,34(9):870-875. [11] 邱丽,冯芳莉,李丹丹,等.海南省2011—2015年度流感暴发疫情流行病学特征分析[J].中国热带医学,2016,16(10):978-980. [12] 孙品晶,董莹,李清,等.海宁市老年人流感疫苗接种效果评价[J].预防医学,2020,32(9):929-932. [13] PAN Y,WANG Q,YANG P,et al.Influenza vaccination in preventing outbreaks in schools:a long-term ecological overview[J].Vaccine,2017,35(51):7133-7138. [14] 冯宝玉,杨军勇,刘璐,等.2017—2018年北京市丰台区小学生流感疫苗接种及保护效果评价[J].实用预防医学,2020,27(12):1460-1463. [15] 中国国家流感中心.流感周报[EB/OL].[2023-07-05].https://ivdc.chinacdc.cn/cnic/zyzx/lgzb. [16] PARK J E,RYU Y.Transmissibility and severity of influenza virus by subtype[J].Infect Genet Evol,2018,65:288-292. |
|
|
|