Diphtheria.
D002675:Child, Preschool; D003937:Diagnosis, Differential; D004165:Diphtheria / Q000175:diagnosis* / Q000517:prevention & control; D004168:Diphtheria Toxoid; D006801:Humans; D007223:Infant; D012141:Respiratory Tract Infections / Q000175:diagnosis
D004168:Diphtheria Toxoid