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目的:通过对北京市密云县流感监测结果的分析,了解流感流行特征,为流感防控提供科学依据。方法:2011年10月-2012年5月期间,以密云县医院为哨点医院,收集流感监测病原学,流行病学监测数据,分析流感病毒流行特征。结果:共监测流感样采集648例,分离流感病毒104件,分离阳性率为16.0%,其中B型Victoria系毒株70株(67.3%),B型Yamagata系毒株21株(20.2%),H3N2亚型毒株13株(12.5%);2012年1月-2012年3月份位流感流行高峰期;阳性病例主要分布在16岁～25岁年龄组和26岁～54岁年龄组;男女性别之间的分离阳性率差别具有统计学意义(P<0.05)。结论:北京市密云县2011年10月-2012年5月流感监测期间流行的高峰期在2012年2月份,主要以B型Victoria系为主,易感人群集中在中青年和女性。
OBJECTIVE: To understand the epidemic characteristics of influenza by analyzing the results of influenza surveillance in Miyun County, Beijing, and provide a scientific basis for prevention and control of influenza. Methods: From October 2011 to May 2012, Miyun County Hospital was selected as a sentinel hospital to collect influenza surveillance etiology and epidemiological surveillance data to analyze the epidemic characteristics of influenza virus. Results: A total of 648 influenza virus samples were collected and 104 influenza viruses were isolated. The positive rate of isolation was 16.0%. Among them, 70 strains (67.3%) of type B Victoria strains, 21 strains (20.2%) of type B Yamagata strains, 13 strains of H3N2 subtype (12.5%); the peak of the bit flu epidemic from January 2012 to March 2012; the positive cases were mainly distributed in the age group of 16 to 25 years and the age group of 26 to 54 years; The difference between the positive rate of separation was statistically significant (P <0.05). Conclusions: The peak period prevalence during influenza surveillance in Miyun County, Beijing from October 2011 to May 2012 was mainly in Victoria Department of Type B in February 2012. The predominant population was concentrated in middle-aged and young women.