title: Purified protein derivative; facts for occasional user.
mesh_terms: D005189:False Positive Reactions; D006801:Humans; D008214:Lymphocytes / Q000276:immunology; D012882:Skin Tests; D014373:Tuberculin / Q000276:immunology*; D014376:Tuberculosis / Q000276:immunology
chemical_list: D014373:Tuberculin