title: Letter: Skin testing with multiple PPD antigens in the differential diagnosis of mycobacterial disease.
mesh_terms: D000942:Antigens, Bacterial; D003937:Diagnosis, Differential; D006801:Humans; D008171:Lung Diseases / Q000175:diagnosis*; D009164:Mycobacterium Infections / Q000175:diagnosis*; D013183:Sputum / Q000382:microbiology; D014374:Tuberculin Test; D014397:Tuberculosis, Pulmonary / Q000175:diagnosis*
chemical_list: D000942:Antigens, Bacterial