Epidemiological characteristics of influenza outbreaks in China,2005-2013
10.3760/cma.j.issn.0254-6450.2015.07.009
- VernacularTitle:中国2005－2013年流感暴发疫情的流行病学特征分析
- Author:
Ming LI
1
;
Luzhao FENG
;
Yu CAO
;
Zhibin PENG
;
Hongjie YU
Author Information
1. 中国疾病预防控制中心传染病预防控制处传染病监测预警中国疾病预防控制中心重点实验室
- Keywords:
Influenza;
Outbreak;
Virus type;
Epidemiologic characteristics
- From:
Chinese Journal of Epidemiology
2015;(7):705-708
- CountryChina
- Language:Chinese
-
Abstract:
Objective To understand the epidemiological characteristics of influenza outbreaks in China from 2005 to 2013. Methods The data of influenza-like illness outbreaks involving 10 or more cases were collected through Public Health Emergency Management Information System and National Influenza Surveillance Information System in China,and the influenza outbreaks were identified according to the laboratory detection results. Descriptive epidemiological analysis was conducted to understand the type/subtype of influenza virus and outbreak time,area,place and extent. Results From 2005 to 2013,a total of 3 252 influenza-like illness outbreaks were reported in the mainland of China,in which 2 915 influenza outbreaks were laboratory confirmed,and influenza A(H1N1) pdm09 virus and influenza B virus were predominant. More influenza outbreaks were reported in the influenza A(H1N1)pandemic during 2009-2010. Influenza outbreaks mainly occurred during winter-spring,and less influenza outbreaks occurred in winter and summer vocations of schools. More influenza outbreaks were reported in southern provinces,accounting for 79% of the total. Influenza outbreaks mainly occurred in primary and middle schools,where 2 763 outbreaks were reported,accounting for 85% of the total. Averagely 30-99 people were involved in an outbreak. Conclusion A large number of influenza outbreaks occur during influenza season every year in China,the predominant virus type or subtype varies with season. Primary and middle schools are mainly affected by influenza outbreaks.
