2011-2017年河北省甲型H1N1流感流行特征分析

目的掌握河北省甲型H1N1流感的流行特征,为流感防控提供科学依据.方法通过中国流感监测信息系统收集河北省2011年4月至2017年3月流感及流感样病例(influenza-likeillness,ILI)监测数据进行统计分析.结果共检测ILI标本77 008份,甲型H1N1流感病毒核酸阳性2 699份,阳性率3.50％.对2 699例甲型H1N1流感病例进一步分析显示:全省11个地市均有该病例检出,男女比例为1.09:1,各年龄组均可发病,检出率最高的是25～59岁组,最低0～4岁组.2011年11月至2017年3月共出现4次流行,具有明显的季节性,且呈单峰性.各年度均有甲型H1N1流感病例检出,甲型H1N1流感分别是2012-2013、2013-2014和2016-2017年度的优势病原.结论河北省甲型N1N1流感流行具有明显的季节性,冬春季流行,近年来感染以5～14岁年龄组为主.

Epidemiological analysis of influenza A (H1N1) pdm09 in Hebei Province from 2011 to 2017

Objective This study aimed to analyze the epidemiological characteristics of influenza A (H1N1) pdm09 in Hebei province so as to provide scientific basis for its prevention and control.Methods The analysis was conducted on the data of cases of influenza and influenza-like illness (ILI) in Hebei province from April 2011 to March 2017,which were collected from the Chinese National Influenza Surveillance Network.Results A total of 77 008 specimens were collected and 2 699 (positive rate of 3.50％) were positive for influenza A (H1N1) pdm09.Further analysis to the 2 699 cases ofA (H1N1) pdm09 showed that cases could be detected in all 11 regions.The male to female ratio was 1.09:1.The highest detection rate was in the 25 ～ 59 years old group,and the lowest was in the 0 ～ 4 years old group.From April 2011 to March 2017,there were four epidemics of influenza A (H1N1) pdm09 with obvious seasonality and one single peak in each epidemic.It was showed that the influenza A (H1N1) pdm09 cases could be detected each year,and it was the dominant pathogen of influenza virus in these surveillance years (2012-2013,2013-2014,2016-2017).Conclusions The prevalence of influenza A (H1N1) pdm09 in Hebei province had an obvious seasonality (in winter and spring),and the infections were intensive in the age group of 5 ～ 14 years old in the past few years.