Influenza: 1979-80.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004739:England; D006801:Humans; D007223:Infant; D007251:Influenza, Human / Q000453:epidemiology*; D008875:Middle Aged; D014852:Wales