Skip directly to search Skip directly to A to Z list Skip directly to site content
CDC Home

Volume 16, Number 11—November 2010

Dispatch

Estimates of the True Number of Cases of Pandemic (H1N1) 2009, Beijing, China

Xiaoli Wang, Peng Yang, Holly Seale, Yi Zhang, Ying Deng, Xinghuo Pang, Xiong He, and Quanyi WangComments to Author 
Author affiliations: Beijing Center for Disease Prevention and Control, Beijing, People’s Republic of China (X. Wang, P. Yang, Y. Zhang, Y. Deng, X. Pang, X. He, Q. Wang); Capital Medical University School of Public Health and Family Medicine. Beijing (X. Wang, P. Yang, Y. Zhang, Y. Deng, X. Pang, X. He, Q. Want); University of New South Wales, Sydney, New South Wales, Australia (H. Seale)

Main Article

Table 2

Estimated numbers of persons infected with pandemic (H1N1) 2009 and infection rate, by age group, Beijing*

Age group, y Proportion of total no. persons infected, % Estimated no. cases, median (90% CI) Estimated rate, %, median (90% CI)
0–4 13.4 241,253 (195,910–307,571) 30.8 (25.0–39.2)
5–14 35.1 632,300 (513,459–806,111) 31.8 (25.8–40.6)
15–24 29.4 528,597 (429,247–673,902) 22.2 (18.0–28.3)
25–59 20.9 375,383 (304,829–478,571) 4.1 (3.3–5.2)
>60
1.3
22,865 (18,568–29,150)
0.9 (0.7–1.1)
Total 100.0 1,800,399 (1,462,012–2,295,305) 10.6 (8.6–13.5)

*CI, confidence interval.

Main Article

Top of Page

USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO