A TWENTY-ONE-YEAR EXPERIENCE WITH ANTIGENIC VARIATION AMONG INFLUENZA B VIRUSES.
D000940:Antigenic Variation; D000941:Antigens; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007106:Immune Sera; D009981:Influenza B virus; D009975:Orthomyxoviridae
D000941:Antigens; D007106:Immune Sera
ANTIGENS; HEMAGGLUTINATION INHIBITION TESTS; IMMUNE SERUMS; INFLUENZA VIRUSES