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4月25日卫生部首次通报甲型H1N1流感疫情信息,称接世界卫生组织通报,美国和墨西哥发生人感染A/H1N1猪流感疫情。4月27日世界卫生组织将流感大流行警戒级别从3级提高到4级。4月28日胡锦涛就防控此次流感作重要指示,温家宝主持召开国务院常务会议研究部署防控工作。
On April 25, the Ministry of Health first reported information about the outbreak of influenza A (H1N1), alleging that the World Health Organization (WHO) notified that human infection with the A / H1N1 swine flu occurred in the United States and Mexico. On April 27, WHO raised the level of the pandemic alert from level 3 to level 4. On April 28, Hu Jintao made important instructions on preventing and controlling this flu. Wen Jiabao chaired a State Council executive meeting to study and deploy prevention and control work.