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1.严重威胁人类的生命与健康。历史上的流感大流行:1918-1919年:全世界约1/3的人口(约5亿人)感染流感并出现临床症状,其中约5000万人因流感死亡。1957-1958年:全球约200万人因流感死亡。1968-1969年:全球约100万人因流感死亡。2.医疗卫生系统超负荷运转:绝大多数人对大流行流感
1. Serious threat to human life and health. The Pandemic of History: 1918-1919: About one-third of the world’s population (about 500 million people) is infected with flu and presents with clinical symptoms, of which about 50 million people are killed by flu. 1957-1958: About 2 million people worldwide die of flu. 1968-1969: About 1 million people worldwide die of flu. 2. Health care system overload: the vast majority of people on pandemic flu