Comparison Influenza B Virus Strains from the 1950 Epidemic with Strains from Earlier Epidemics

Abstract
Cross serologic reactions indicated that egg strains of influenza B virus obtained in different yrs. were dissimilar in antigenic composition. The extent of the differences in antigenic pattern was analyzed. All strains studied were antigenically different from the mouse adapted Lee strain. The implication of these findings on the problem of immunization in man was discussed.