[Antigenic determinants of the hemagglutinin of influenza virus type B].

A comparative immunological analysis of 3 influenza type B virus strains, B/Lee/40, B/M/8/52, and B/Victoria/70 was made. The presence of at least 3 antigenic determinants in hemagglutinins of the viruses under study was established by the method of selective adsorption. One of the determinants was type-specific and was shared by all the three strains, the other two determined the group- and strain-specificity of the viruses studied.