Immunization on public trial.
D002648:Child; D003256:Community Participation; D003657:Decision Making; D006801:Humans; D007114:Immunization / Q000009:adverse effects; D007251:Influenza, Human / Q000517:prevention & control; D007883:Legislation, Medical; D009017:Morbidity; D009026:Mortality; D011051:Poliomyelitis / Q000517:prevention & control; D012306:Risk; D014481:United States; D014611:Vaccination / Q000009:adverse effects