Analysis of influenza surveillance 2009-2012 in Gansu province
10.3760/cma.j.issn.1003-9279.2014.02.015
- VernacularTitle:2009-2012年甘肃省流感监测病原学结果分析
- Author:
Hongyu LI
1
;
Hui ZHANG
;
Zhongyi JIANG
;
Baodi LI
;
Deshan YU
Author Information
1. 甘肃省疾病预防控制中心
- Keywords:
Influenza A virus;
Influenza B virus;
Immundogic surveillance;
Polyomerage chain reaclion;
Virus cultirations
- From:
Chinese Journal of Experimental and Clinical Virology
2014;28(2):120-122
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the epidemical characteristics of influenza in Gansu province from 2009 to 2012,and to discuss the changes of the predominant strains of influenza virus.In order to provide scientific basis for defending influenza effectively.Methods Influenza surveillance was performed by collecting the pharyngeal swab specimens from influenza patients of national surveillance hospitals and places with suspected influenza epidemic situations,inoculated on MDCK cell culture to obtain the influenza virus strains.Results From Jan.2009 to Dce.2012 36892 specimens were collected,and 8030 were positive for influenza virus,including 4331 influenza A (H1 N1),seasonal H3N2 subtype1562,H1N1 subtype 96,1651 type B,and 380 type A with unknown subtype strains.During the period from 2009 to 2012,the positive of influenza virus isolation was 32.71％,13.95％,7.80％,and 19.64％,respectively.Totally 1149 influenza virus strains were isolated,positive rate was 16.24％,of them,346 strains were SWA1 (H1pdmN1),34 strains were A1 (H1N1),183 strains were A3 (H3N2),470 strains were subtype B of Victoria and 116 strains were subtype B of Yamagata.Conclusion In 2009 new influenza A (H1N1) was the major epidemic,and in 2010-2011 the activity of influenza was very weak,only presented as sporadic disease.In the spring of 2012,type B influenza was dominant,while since Nov.type A (H1N1) and seasonal H3 were dominant.There was a peak of influenza epidemic each year,and alternative viral types predominance was the rule.
