title: An introduction to "Le Pap".
mesh_terms: D000486:Allergy and Immunology / Q000266:history*; D004165:Diphtheria / Q000276:immunology; D004168:Diphtheria Toxoid / Q000266:history; D049673:History, 20th Century; D006801:Humans; D014481:United States
chemical_list: D004168:Diphtheria Toxoid