Influenza vaccine effectiveness: Two epidemiological studies, 1980-1981 outbreak.
D003237:Connecticut; D004196:Disease Outbreaks; D006801:Humans; D007252:Influenza Vaccines / Q000008:administration & dosage*; D007251:Influenza, Human / Q000276:immunology / Q000517:prevention & control*; D014611:Vaccination / Q000379:methods*
D007252:Influenza Vaccines