Diphtheria, tetanus, and pertussis immunization.
D002648:Child; D002675:Child, Preschool; D004165:Diphtheria / Q000276:immunology; D004168:Diphtheria Toxoid; D006801:Humans; D007115:Immunization Schedule; D010567:Pertussis Vaccine; D013742:Tetanus / Q000276:immunology; D013745:Tetanus Toxoid; D014611:Vaccination; D014917:Whooping Cough / Q000276:immunology
D004168:Diphtheria Toxoid; D010567:Pertussis Vaccine; D013745:Tetanus Toxoid