2008～2018年大连市流感特征分析

Analysis on the epidemiological characteristics of influenza,Dalian city,2008-2018

目的了解大连市2008～2018年流感流行特征和流感病毒优势株的变化。方法使用"中国流感监测信息系统"中2所国家级哨点医院流感样病例和百分比的周数据以及流感病原学监测周数据,分析流感样病例发病趋势和流感病毒构成情况。结果 2008年4月至2018年3月,大连市流感样病例(ILI)、流感样病例百分比(ILI%)与流感病毒阳性率变化趋势一致(r=0.57、P<0.01,r=0.56、P<0.01),发病高峰为每年冬春季。各监测季流感病毒亚型构成不同。结论 2008年4月至2018年3月,大连市甲型H1N1、甲型H3N2、乙型Victoria系、乙型Yamagata系流感均有流行,且各年度优势毒株不同。

Objective To understand the epidemiological characteristics and the dominant strain changes of influenza in Dalian city during 2008-2018.Methods Weekly data of influenza-like illness(ILI)cases and the percentage and the virology surveillance were collected from 2 national influenza surveillance sentinel hospitals in China Influenza Surveillance Information System to analyze the incidence trend of ILI and the composition of influenza virus.Results From April 2008 to March 2018,the trend among ILI,the proportion of ILI(ILI%)and the positive rate of influenza virus was consistent in Dalian city(r=0.57,P<0.01;r=0.56,P<0.01).Winter and spring were the peak seasons.The detected influenza virus subtypes varied in each surveillance seasons.Conclusion During April 2008-March 2018,subtypes including A(H1 N1),A(H3 N2),B virus(Victoria lineage),B virus(Yamagata lineage)are prevalent in Dalian city,and the dominant virus subtypes vary in each year.