2009年北京市西城区流感监测结果分析

ANALYSIS OF INFLUENZA SURVEILLANCE IN XICHENG DISTRICT OF BEIJING IN 2009

目的了解北京市2009年流感流行规律和毒株的变异动态,为及早发现和控制疫情提供科学依据。方法 2009年以北京市人民医院、北京市儿童医院及北大医院作为哨点医院,对流感的流行病学、病原学监测结果进行分析。结果 2009年在2215021例门诊病例中监测到流感样病例140654例,占就诊比例为6.35%,以0～岁及5～岁2个年龄组居多,占流感样病例就诊总数的96.06%。共采集咽拭子标本1916份,分离出流感病毒718株,阳性率37.47%,其中甲型H1N1流感病毒391株占54.46%。结论流感样病例的就诊比例能够很好地反映流感病毒的活动情况,2009年北京市流感的流行以甲型H1N1流感为主,是流感流行的优势株。需继续加强流感监测工作,以掌握流感毒株的变异。

Objective To understand the epidemics of influenza and the variation of viruses in Beijing of 2009 so as to provide scientific basis for early discovering and controlling epidemic situation. Methods The people＇s hospital, Beijing children hospital and the first hospital of Beijing university were chosen to analyze the monitoring results of the epidemiology, virus strains and serum isolation. Results Among 2 215 021 outpatients, there were 140 654 eases of influenza - like illness （ILI） in 2009 and the percentage of ILI in the outpatients was 6.35%. The mainly groups were 0 years old and 5years old, accounting for 96.06% of the total ILl cases. Seven hundred and eighteen influenza strains were isolated from 1 916 specimens of ILl cases and 54.46 % （391） was identified as influenza A virus （H1N1）. Conclusion The vary trend of ILI patients can explain the activities of the local influenza much better. H1 N1 is the predominant circulating influenza virus type in 2009. It is important to pay more attention to the antigenic variation of the influenza virus and to strengthen the influenza surveillance.