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流行性感冒(流感)是一种人类目前尚不能控制的由流感病毒引起的急性传染病。以病毒抗原变异频繁,流行速度特快,能引起世界性大流行为其特点。流感病毒是RNA病毒,根据其核蛋白成分和表面抗原特点的不同,将其分为甲、乙、丙三个型和不同亚型。如抗原成分发生数量改变时,可出现2—3年一次的小流行;如果其发生质变时,则出现1012年一次的大流行。当前的流行,甲型流感占统治地位,乙型是局部流行,丙型少见而以散发为主。国际上一直怀疑我国是流感流行的发源地,世界流感协作中心把我国流感流行动态列为其监测的重点。如1957年甲_2亚型流感大流行,2月首先在我国贵州西部起始,3月波
Influenza (flu) is an acute infectious disease caused by the flu virus that humans can not control at present. With frequent variation of viral antigens, the prevalence of rapid epidemic, can cause a worldwide pandemic for its characteristics. Influenza virus is an RNA virus, which is divided into three subtypes, A, B and C and different subtypes according to its nuclear protein components and the characteristics of surface antigens. In the event of a change in the quantity of antigenic components, a small epidemic of 2-3 years may occur; in 1012, a pandemic occurs if the qualitative change occurs. The current epidemic, influenza A dominates, B is a local epidemic, C is rare and the distribution of the main. Internationally, it has been suspected that our country is the cradle of the influenza epidemic. The World Center for Influenza Cooperation has listed the epidemic of influenza in our country as the focus of its monitoring. Such as 1957 A _2 subtype influenza pandemic, first in February in our country in western Guizhou, March wave