Epidemiological analysis of elderly cases with the 2009 influenza A (H1N1) in Beijing
10.3760/cma.j.issn.0254-9026.2010.10.025
- VernacularTitle:2009年北京市老年人甲型H1N1流感流行病学分析
- Author:
Xinyu LI
;
Yang LI
;
Xin ZHAO
;
Quanyi WANG
;
Peng YANG
;
Ting GAO
;
Ying DENG
;
Xinghuo PANG
- Publication Type:Journal Article
- Keywords:
Influenza Avirus,H1N1 subtype;
Epidemiologic factors
- From:
Chinese Journal of Geriatrics
2010;29(10):866-869
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze epidemiological characteristics of elderly cases with influenza A (H1N1) in Beijing. Methods Descriptive epidemiological methods were used to describe epidemiological characteristics of elderly cases with 2009 influenza A (H1N1) in Beijing. Results The 321 laboratory-confirmed elderly cases with influenza A (H1N1) were reported in Beijing, and the morbidity was 13.2/100 000. The peak of infection occurred during November and December, the cases in this period accounted for 84.7% of the whole year, and 53.0% of them were reported in suburb areas, with the highest morbidity (19.2/100 000) in people beyond 85 years, and the morbidity increased with age (x2 = 7.24, P＜0.01). The mild cases accounted for 63.6 %, severe and critical cases accounted for 36.4%. No significant difference was found between severity and BMI (x2=8.14, P=0.52). Severity was associated with number of chronic diseases (x2= 123.0, P＜0. 01). Conclusions The H1N1 morbidity and proportion of severe cases are high among the elderly in Beijing, more attention should be paid to this population for influenza A (H1N1) prevention and control.
