Etiological characteristics of influenza A (H1N1) 2009 virus in Beijing
10.3760/cma.j.issn.0254-6450.2010.05.004
- VernacularTitle:北京市甲型H1N1流感病毒病原学监测分析
- Author:
Fang HUANG
1
;
Jing GUO
;
Shu-Juan CUI
;
Yan-Ning LV
;
Zhi-Yong GAO
;
Wei-Hong LI
;
Han-Qiu YAN
;
Mei QU
;
Wei-Xian SHI
;
Gui-Lan LU
;
Xin ZHANG
;
Dai-Tao ZHANG
;
Li-Li TIAN
;
Hai-Kun QIAN
;
Peng YANG
;
Xing-Huo PANG
;
Quan-Yi WANG
Author Information
1. 北京市疾病预防控制中心
- Keywords:
InfluenzaA(H1N1)2009;
Real-time PCR;
Etiology
- From:
Chinese Journal of Epidemiology
2010;31(5):494-496
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the results of detection on influenza A (H1N1) 2009 virus in Beijing from May 2009 to December 2009 and to understand the epidemiologic characteristics during the pandemic period. Methods The study was conducted from the May 1 to December 27,2009. A total of 101 852 throat swab samples were detected with the real-time RT-PCR assay by the Beijing Network Laboratory. Data was statistically analyzed. Results 9843 samples showed influenza A (H1N1) 2009 positive, with an overall positive rate as 9.66%. In terms of the positive rates, they were 2.85% from May to June, 3.32% from July to August and 8.35% from September to October. The peak month fell in November (29.67%) and December (24.33%). The positive rates among the following subpopulations were: 8.40% among the suspected cases, 4.75% among close contact cases, 11.46% among the influenza-like illness cases and 7.33% among the cluster cases with fever. Positive cases mainly fell in age groups 5-14 and 15-24. The ratio of male to female was 1.5:1.Conclusion During the pandemic period of influenza A (H1N1) 2009, positive cases gradually increased during May to November but slowly decreasing in December.
