2012-2013年石家庄市流行性感冒监测结果分析

Analysis on the influenza surveillance results during 2012-2013 in Shijiazhuang city

目的分析石家庄市流行性感冒(简称流感)流行病学特征,为流感的防控提供参考依据。方法收集2012年4月-2013年3月石家庄市流感样病例的监测数据,分析流行病学及病原学检测结果。结果 2012-2013年石家庄市流感监测哨点医院流感样病例(influenza-like illness,ILI)就诊百分比(ILI%)平均为1.05%,冬春季节出现流行高峰。共采集流感样病例标本711份,核酸检测阳性108份,阳性率为15.18%。分离得到流感毒株92株,总分离率为12.94%,其中B型1份、甲型H1N1型47份、季节性H3N2型44份。结论石家庄市流感活动具有季节性特点,活动高峰期出现在冬春季节,ILI流行高峰与病毒检出高峰基本一致。季节性H3N2型流感毒株在2013年1月前为主要优势流行株,2013年1月后甲型H1N1型流感毒株成为优势流行株。病毒分离率与年龄及性别无关。

Objective To analyze the epidemiological characteristics of influenza in Shijiazhuang city, so as to provide scientific evidence for influenza prevention and control. Methods The data of influenza - like illness （ILI） from April of 2012 to March of 2013 in Shijiazhuang were collected, epidemiologically and pathogenically detected. Results The average proportion of ILI cases in outpatients was 1.05% during 2012 -2013, popular peak was in winter and spring. A total of 711 swab samples were collected, 108 were influenza posi- tive, with the detection ratio 15. 18%. 92 strains were isolated with the positive rate of 12. 94%, among which 1 strain was B subtype, 47 strains were pandemic A （H1N1） subtype, 44 strains were seasonal A （H3 N2） subtype. Conclusions The popularity of influenza has seasonal characteristics in Shijiazhuang city, the incidence peak was in winter and spring, the highest positive rate of influenza virus was consistent with the ILI（ ILI% ） peaks. Seasonal A （H3N2） subtype remained the dominant circulating influenza virus until January 2013, followed by pandemic A （ H1N1 ） subtype influenza virus after January of 2013. Viral isolation rate is irrelevant with age and gender.