https://tube.kla.tv/videos/watch/da74b8c3-4299-487e-afd0-2b21caacbd8d 为了将2009年5月的猪流感定义为特大流行性传染病，世界卫生组织特地将第6级别特大流行性传染病的定义进行了修改。 特大流行性传染病的衡量标准之一，高死亡率，当时被取消了。 Tue, 26 May 2026 19:42:22 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://tube.kla.tv https://tube.kla.tv/client/assets/images/icons/icon-96x96.png https://tube.kla.tv/videos/watch/da74b8c3-4299-487e-afd0-2b21caacbd8d All rights reserved, unless otherwise specified in the terms specified at https://tube.kla.tv/about and potential licenses granted by each content's rightholder.