Prevalence of antibodies in different age groups to pandemic & epidemic strains of influenza virus.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000914:Antibodies, Viral / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007109:Immunity; D007223:Infant; D008875:Middle Aged; D009975:Orthomyxoviridae / Q000276:immunology*
D000914:Antibodies, Viral