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Sentinel surveillance for influenza-like illness (ILI) and virologic surveillance, People’s Republic of China, 2007–2010, A) Weekly percentage of visits for ILI, sentinel ILI surveillance, People’s Republic of China, 2007–08 through 2009–10. B) Number and percentage of specimens positive for influenza, by week of specimen collection during sentinel ILI surveillance in China, May–November 2009.
