The United States swine influenza immunization program: a New York City perspective.
D049673:History, 20th Century; D006801:Humans; D007114:Immunization / Q000266:history; D009980:Influenza A virus; D007252:Influenza Vaccines / Q000008:administration & dosage*; D007251:Influenza, Human / Q000517:prevention & control*; D009519:New York City
D007252:Influenza Vaccines