Flu--1976.
D004196:Disease Outbreaks / Q000517:prevention & control; D006801:Humans; D007114:Immunization; D009980:Influenza A virus; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000517:prevention & control; D009313:National Health Programs; D014481:United States
D007252:Influenza Vaccines