[Antigenic similarity of the hemagglutinins of human and animal influenza A viruses studied by immunoadsorption].

Antigenic relationships between human influenza A viruses containing hemagglutinins of HO and H1 subtypes and animal and avian influenza viruses Hsw1 and Hav5 were studied by immunoadsorption using inorganic base of the sorbent. Direct and indirect relations due to the presence in hemagglutinin of common antigenic determinants and hapten groups were revealed. The strains representing drift variations within one subtype differed by the spectrum of hapten determinants typical of other subtypes. No common determinant typical for all members of this group was isolated.