北京市甲型H1N1流感病毒病原学监测分析
Etiological characteristics of influenza A (H1N1) 2009 virus in Beijing
目的 分析北京市2009年5-12月甲型H1N1流感病毒检测结果,探讨流感大流行时期甲型H1N1流感病原流行病学特征.方法 2009年5月1日至2009年12月27日,共采集101 852份咽拭子样本,北京市传染病网络实验室利用荧光定量PCR方法检测,并做统计分析.结果 101 852份检测样本中,甲型H1N1流感病毒核酸阳性9843份,总阳性率为9.66%,其中5-6月阳性率为2.85%,7-8月阳性率为3.32%,9-10月阳性率为8.35%,11月阳性率为29.67%,12月阳性率为24.33%.可疑病例排查阳性率为8.40%,病例密切接触者阳性率为4.75%,门诊流感样病例(ILI)阳性率为11.46%,聚集性发热病例及其他病例阳性率为7.33%.年龄分布以5~14岁和15~24岁年龄段为主,男女性别构成比为1.5:1.结论 北京市2009年5-11月甲型H1N1流感病毒感染呈持续上升,12月呈下降趋势,具有一定的流行病学特征.
更多Objective To analyze the results of detection on influenza A (H1N1) 2009 virus in Beijing from May 2009 to December 2009 and to understand the epidemiologic characteristics during the pandemic period. Methods The study was conducted from the May 1 to December 27,2009. A total of 101 852 throat swab samples were detected with the real-time RT-PCR assay by the Beijing Network Laboratory. Data was statistically analyzed. Results 9843 samples showed influenza A (H1N1) 2009 positive, with an overall positive rate as 9.66%. In terms of the positive rates, they were 2.85% from May to June, 3.32% from July to August and 8.35% from September to October. The peak month fell in November (29.67%) and December (24.33%). The positive rates among the following subpopulations were: 8.40% among the suspected cases, 4.75% among close contact cases, 11.46% among the influenza-like illness cases and 7.33% among the cluster cases with fever. Positive cases mainly fell in age groups 5-14 and 15-24. The ratio of male to female was 1.5:1.Conclusion During the pandemic period of influenza A (H1N1) 2009, positive cases gradually increased during May to November but slowly decreasing in December.
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