Study on seasonal characteristics and pathogenic distribution of influenza in Gansu province of China
10.3760/cma.j.issn.0254-6450.2017.06.015
- VernacularTitle:甘肃省流感季节性流行特征及病原变迁研究
- Author:
Xiaoting YANG
1
,
2
;
Xinfeng LIU
;
Jian HE
;
Deshan YU
;
Dongpeng LIU
;
Hongyu LI
;
Baodi LI
;
Yana BAI
Author Information
1. 730000兰州,甘肃省疾病预防控制中心传染病预防控制所
2. 730000 兰州大学公共卫生学院流行病与卫生统计学研究所
- Keywords:
Influenza;
Subtype;
Seasonality;
Vaccination
- From:Chinese Journal of Epidemiology
2017;38(6):763-766
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the epidemiologic characteristics of influenza in Gansu province of China and to optimize the related vaccination program.Methods Weekly influenza surveillance data from the first week of 2010 to the fortieth week of 2016 were collected,in Gansu province.x2 test was used to compare the differences of nucleic acid positive rate and the virus types in the four seasons.Time series seasonal decomposition (TSSD) was used to explore seasonal patterns and characteristics of influenza epidemics in Gansu.Results 59 791 specimens were tested,with 8 501 positive for influenza virus and positive rates as 14.22％.Types A(H1N1)pdm09,A(H3N2) and type B were accounted for 98.76％ of all the positive specimens.Proportions of the positive rate of influenza virus appeared in spring,summer,autumn and winter were 15.12％,0.98％,4.02％ and 24.26％ respectively.The predominant type of virus in autumn and winter was A(H3N2),with B mainly in spring.Influenza in Gansu province showed typical single-peak type distribution,with epidemic peak appeared from December to next January.The type A(H3N2) related peak appeared the earliest,followed by A(H1N1)pdm09,with type B the latest.Conclusions Peaks and the duration of influenza seasonal epidemics were related to the types of dominant strains.Annual influenza vaccination campaigns should start in October,to provide effective protection during the epidemic period.
