Editorial: The national influenza immunization program.
D000367:Age Factors; D000368:Aged; D000914:Antibodies, Viral / Q000032:analysis; D004196:Disease Outbreaks / Q000517:prevention & control*; D006801:Humans; D007114:Immunization; D009980:Influenza A virus / Q000276:immunology; D007251:Influenza, Human / Q000517:prevention & control*; D008875:Middle Aged; D014481:United States
D000914:Antibodies, Viral