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[目的]了解开封市流感流行状况及动态变化规律,每年的流行株及其构成,为制定流感防治策略提供依据。[方法]通过“中国流感监测信息系统”收集开封市国家级流感监测哨点医院和网络实验室报告的数据,对其进行分析。[结果]开封市国家级流感监测哨点医院共报告流感样病例3475例,流感样病例占门诊就诊总数百分比(ILI%)为4.67%。2009年第47周流感样病例数和流感样病例就诊百分比均为最高(429,18.28%),15～25岁年龄组流感样病例门急诊就诊比例最高(1.83%),流感病毒优势毒株为甲型H1N1。2009年第49周流感病毒阳性率达到最高(85.00%),2009年11月份、12月份和2010年1月份甲型H1N1流感病毒占流感病毒阳性标本比例较高。[结论]2009～2010年流感病毒优势毒株为甲型H1N1,11月份为发病的高峰,应密切监测甲型H1N1流感病毒毒株在开封市的变异及活动趋势。
[Objective] To understand the prevalence and dynamics of influenza in Kaifeng City, the annual epidemic strains and their composition, and provide the basis for the development of influenza prevention and control strategies. [Methods] The data collected from the national influenza surveillance sentinel hospitals and network laboratories in Kaifeng City were collected through “China Influenza Surveillance Information System” and analyzed. [Results] A total of 3475 influenza-like cases were reported in the national influenza surveillance sentinel hospitals in Kaifeng City. The proportion of flu-like cases out of the total number of outpatient visits (ILI%) was 4.67%. In the 47th week of 2009, the number of flu-like cases and the number of flu-like cases were the highest (429,18.28%). The highest incidence of flu-like cases in the age group 15-25 was 1.83% Influenza A H1N1 2009 49 weeks of the highest positive rate of influenza virus (85.00%), in November 2009, December and January 2010 the influenza A H1N1 influenza virus accounted for a higher proportion of positive specimens of influenza virus. [Conclusion] The dominant strain of influenza virus from 2009 to 2010 was H1N1 in November and the highest peak of the virus was in November. Therefore, the variation and trend of influenza A (H1N1) virus strains in Kaifeng should be closely monitored.