title: Seroconversion following primary immunization with D.P.T. vaccine: two versus three doses.
mesh_terms: D004168:Diphtheria Toxoid / Q000276:immunology*; D005260:Female; D000949:Histocompatibility Antigens Class II / Q000032:analysis; D006801:Humans; D007223:Infant; D008297:Male; D010567:Pertussis Vaccine / Q000276:immunology*; D013745:Tetanus Toxoid / Q000276:immunology*
chemical_list: D004168:Diphtheria Toxoid; D000949:Histocompatibility Antigens Class II; D010567:Pertussis Vaccine; D013745:Tetanus Toxoid