On August 9, 2009, it was learned from the Health Department of Hunan Province on August 8 that an epidemic of H1N1 influenza broke out in a secondary school in Yongzhou City, Hunan Province. Four of the 13 suspected H1N1 influenza patients have been confirmed. The head of the Emergency Office of the Health Department of Hunan Province introduced that the school where the epidemic broke out is located in the urban area of Yongzhou City. Since June 6, students from this school....