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Volume 16, Number 4—April 2010

Letter

Dual Seasonal Patterns for Influenza, China

Yue-Long Shu1, Li-Qun Fang1, Sake J. de Vlas, Yan Gao, Jan Hendrik Richardus, and Wu-Chun Cao1Comments to Author 
Author affiliations: Chinese Center for Disease Control and Prevention, Beijing, People’s Republic of China (Y.L. Shu, Y. Gao); Beijing Institute of Microbiology and Epidemiology, Beijing (L.-Q. Fang); University Medical Center Rotterdam, Rotterdam, the Netherlands (S.J. de Vlas, J.H. Richardus); State Key Laboratory of Pathogen and Biosecurity, Beijing (W.-C. Cao); 1These authors contributed equally to this article.

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Figure

Epidemic patterns, by month, from the surveillance data of the influenza-like illness (ILI) consulting rate and influenza subtypes in ILI patients in mainland China, per month, April 2006–March 2009. A) ILI percentages for northern (dashed lines) and southern (solid lines) mainland China, by age group. B) Average temperature and relative humidity.

Figure. Epidemic patterns, by month, from the surveillance data of the influenza-like illness (ILI) consulting rate and influenza subtypes in ILI patients in mainland China, per month, April 2006–March 2009. A) ILI percentages for northern (dashed lines) and southern (solid lines) mainland China, by age group. B) Average temperature and relative humidity.

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