2009-2011年江西省流行性感冒监测分析

目的 了解江西省流行性感冒(流感)流行特征,探讨流感病毒流行亚型的变化,为流感防制提供参考依据。 方法 采用2009年9月至2011年9月江西省流感监测哨点医院监测的流感样病例(ILI)以及网络实验室对哨点医院采集标本的核酸检测结果,从中国流感监测信息系统导出相关数据,通过统计ILI就诊百分比(ILI%)、ILI年龄构成、ILI采样标本检测的阳性率及亚型构成等指标来进行分析。 结果 哨点医院共监测ILI 167 346例,ILI%平均为3.74%,并且在春秋季分别出现峰值;网络实验室共检测哨点医院采集的标本12 778份,阳性率为25.76%,其中A(H1N1)占53.24%,A未分型占23.46%,B型占21.45%,季节性H3型占1.82%,季节性H1型占0.24%,混合型占0.09%。 结论 在近3年的监测中,流感存在明显的春秋季流行的周期性特点,且在流行峰值出现的时候,存在某些亚型会成为流行亚型,新甲型H1N1在流行后期的偶尔活跃可能会导致季节性流感的流行优势株构成发生一些微弱的变化,但是B型流感无论是在流行季节还是非流行季节都存在一定的阳性比例。

Surveillance of influenza in Jiangxi,2009-2011

Objective To learn about the epidemiological characteristics of influenza in Jiangxi,understand the circulation of subtype influenza viruses and provide scientific evidence for the prevention and control of influenza.Methods The sentinel surveillance data of influenza like illness(ILI) in Jiangxi from 2009 to 2011 were collected to conduct analysis.Results From September 2009 to September 2011,a total of 167 346 ILI cases were reported,which accounted for 3.74% of the total outpatient visit.Two incidence peaks occurred in spring and autumn;Totally 12 778 samples collected from ILI cases were tested in influenza network laboratories,the positive rate was 25.76%.Among the positive samples,influenza A(H1N1) pdm 09(pH1N1) viruses accounted for 53.24%,influenza A viruses unspecified accounted for 23.46%,influenza B viruses accounted for 21.45%,influenza A(H3) virus accounted for 1.82%,influenza A(H1) viruses accounted for 0.24% and the mixed accounted for 0.09%.Conclusion The seasonality of influenza viruses circulation was obvious in Jiangxi during this period.During the incidence peak periods,different predominant subtype strains were detected.The occasional active circulation of(pH1N1) virus at the late phase would have slightly influenced the proportions of the predominant strains of seasonal influenza viruses,but influenza B viruses were detected all the year round.