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流感是由流感病毒侵犯呼吸道而引起的传染病。根据病毒内部核蛋白抗原不同,可将流感病毒分成甲、乙和丙三型,通常由甲、乙两型引起流行,尤其甲型常可造成全国性和世界范围的大流行。近年来,猪、马、火鸡、鸭及某些野鸟中均相继发现有甲型流感病毒的感染。有人认为人间流感的变异株是起源于动物间的流感杂交株。若果真如此,动物宿主在流行病学上将有一定意义。丙型在国内外均少见。流感病毒突出的特点是经常变异。病毒
Flu is an infectious disease caused by the flu virus that invades the respiratory tract. According to different virus internal nucleoprotein antigens, the influenza virus can be divided into A, B and C three types, usually caused by A and B epidemic, especially A can often cause national and worldwide pandemic. In recent years, pigs, horses, turkeys, ducks and some wild birds were found to have influenza A virus infection. Some people think that human influenza variants are originated in the flu between the strains of animals. If so, animal hosts will have some implications in epidemiology. Type C are rare at home and abroad. The outstanding feature of influenza virus is that it is often mutated. virus