title: Letter: Comparative tuberculin reactions.
mesh_terms: D000942:Antigens, Bacterial; D006801:Humans; D007918:Leprosy / Q000276:immunology; D014373:Tuberculin / Q000494:pharmacology*; D014374:Tuberculin Test; D014397:Tuberculosis, Pulmonary / Q000276:immunology
chemical_list: D000942:Antigens, Bacterial; D014373:Tuberculin