title: [Effect of the time intervals of the first 3 vaccinations of combined pertussis-diphtheria vaccine on diphtheria immunity in infants].
mesh_terms: D004165:Diphtheria / Q000276:immunology*; D004168:Diphtheria Toxoid / Q000008:administration & dosage*; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D010567:Pertussis Vaccine / Q000008:administration & dosage*
chemical_list: D004168:Diphtheria Toxoid; D010567:Pertussis Vaccine