Fifteen years' organized fight against diphtheria in Bulgaria.
D000293:Adolescent; D002031:Bulgaria; D002648:Child; D002675:Child, Preschool; D004165:Diphtheria / Q000453:epidemiology / Q000517:prevention & control*; D004168:Diphtheria Toxoid / Q000627:therapeutic use; D006801:Humans; D007112:Immunity, Maternally-Acquired; D007114:Immunization; D007223:Infant; D012882:Skin Tests; D014612:Vaccines
D004168:Diphtheria Toxoid; D014612:Vaccines