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多年来,流感病毒表面抗原变异问题研究中有两种学说,一种学说是自然选择学说,即认为表面抗原变异的量变和质变都是病毒本身突变和人群免疫力不断选择的结果。另一种学说是动物源学说,认为量变是病毒突变和人群免疫力选择的结果,但是质变是与动物流感病毒有关,新亚型是从动物直接传给人或者人与动物流感病毒杂交的结果。1957年甲_2型流感病毒出现后曾有人这样推测。特别是1976年美国新泽西州迪克堡兵营猪
Over the years, there are two theories in the study of the surface antigen variation of influenza virus. One theory is the theory of natural selection, that is, the quantitative and qualitative changes of surface antigen variation are the result of the mutation of the virus itself and the continual selection of human immunity. Another theory is the doctrine of animal origin that quantitative changes are the result of mutations in the virus and the selection of human immunity, but the qualitative changes are related to the animal influenza virus. The new subtype is the result of the direct transmission from animals to humans or the hybridization of human and animal influenza viruses . 1957 A _2 type influenza virus appeared after some people speculate. Especially in 1976, New York, USA Dike Fort barracks pigs