2009年4月份以来,美国、墨西哥等国家发生了甲型H1N1流感流行,并已发生了人传人暴发疫情,迅速蔓延到多个国家和地区。世界卫生组织已宣布此次疫情为“具有国际影响的公共卫生紧急事态”,并已将全球流感大流行警告级别提高到5级。我国卫生部于4月30日宣布将其纳入《中华人民共和 Since April 2009, the influenza A (H1N1) epidemic occurred in the United States and Mexico, and human-related outbreaks have occurred and spread rapidly to many countries and regions. The World Health Organization has declared the outbreak as “a public health emergency with international influence” and has raised the level of the global pandemic alert to five. China’s Ministry of Health announced on April 30 that it will be included in the “People’s Republic of China.”