Objective To investigate the epidemiologic features of influenza A virus and influenza B virus among children with respiratory infection in Nanchang during winter and spring. Methods Serum samples were obtained from 6 130 children diagnosed with respiratory infection in maternal and child health hospital of Jiangxi province between October 2010 to March 2011, and IgM antibodies to influenza virus were detected by indirect immunofluorescence. Results The detection rate of influenza A virus was significantly lower than the detection rate of influenza B virus (0. 75% vs 10. 39%,P-<0. 01). In addition, influenza B virus outbreak occurred in January 2011 and the detection rate of influenza B virus infection was 5 times higher than that during October-December 2010. Conclusion Influenza B virus was main the influenza virus among children with respiratory infection in Nanchang during 2010-2011 winter and spring,and influenza B virus infection outbreak occurred in January 2011.%目的 了解南昌地区冬春季呼吸道感染儿童甲型流行性感冒(流感)病毒、乙型流感病毒的检出率、构成等流行病学特征.方法 对6 130例于2010年10月至2011年3月来江西省妇幼保健院就诊的被诊断为呼吸道感染的儿童,用间接免疫荧光法检测流感病毒IgM抗体.结果 甲型流感病毒检出率为0.75％,乙型流感病毒检出率为10.39％,两者比较差异有统计学意义(P＜0.01).乙型流感病毒检出率在2010年10-12月较低,在2011年1月呈爆发态势,检出率上升5倍.结论 引起南昌地区2010-2011年冬春季呼吸道感染患儿的主要流感病毒为乙型流感病毒,且其在2011年1月有爆发流行的趋势.
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