Diphtheria, pertussis, tetanus, and poliomyelitis in the United States.
D002648:Child; D004165:Diphtheria / Q000453:epidemiology* / Q000276:immunology; D006801:Humans; D007115:Immunization Schedule; D011051:Poliomyelitis / Q000453:epidemiology* / Q000276:immunology; D013742:Tetanus / Q000453:epidemiology* / Q000276:immunology; D014481:United States; D014917:Whooping Cough / Q000453:epidemiology* / Q000276:immunology