甲型H1N1流感是由流感病毒H1N1亚型引起的急性呼吸道传染病。其临床特点与流感病毒的亚型及其变异有关,也与人体的免疫状况和当时的流行情况有关。2009年3月北美发生猪流感,世界卫生组织于2009-04-30宣布不再使用猪流感一词,开始使用甲型H1N1流感。它具有起病急、传染性强、流行广泛、传播迅速的特点。儿童感 Influenza A (H1N1) is an acute respiratory infection caused by the H1N1 subtype of influenza virus. Its clinical features and influenza virus subtypes and their variants, but also with the human immune status and the prevalence of the situation. In March 2009, a swine flu occurred in North America. The World Health Organization announced on 2009-04-30 that it no longer used the word swine flu and started using the H1N1 flu. It has acute onset, contagious, widespread, rapid transmission characteristics. Child feeling