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流行性感冒(简称流感)是由流感病毒及其变异体引起的上呼吸道急性传染病,历史上曾有过几次流感大规模的流行,给人类带来深重的灾难。1918～1920年爆发的“西班牙流感”至少使2千万人丧生。直到现在全世界每年仍有10％的人患流感,主要影响老年人,儿重和患有慢性疾病的人。在美国,每年因流感损失数百万个工作日,导致30万人住院,2～4万人死亡。我国是流感多发地,由于人口密度不
Influenza (influenza) is an acute upper respiratory tract disease caused by the influenza virus and its variants. There have been several large-scale epidemics of influenza in history, causing heavy disasters to human beings. The “Spanish flu” that erupted between 1918 and 1920 killed at least 20 million people. Until now, about 10% of people in the world still suffer from influenza every year, mainly affecting the elderly, children with severe diseases and people with chronic diseases. In the United States, hundreds of thousands of working days are lost each year due to the flu, leaving 300,000 hospitalized and 20,000 to 40,000 dead. My country is susceptible to flu, due to population density