Influenza 1981 to 1982.
D000367:Age Factors; D000368:Aged; D002675:Child, Preschool; D006801:Humans; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines / Q000008:administration & dosage*; D007251:Influenza, Human / Q000517:prevention & control*; D014611:Vaccination / Q000009:adverse effects
D007252:Influenza Vaccines