title: Letter: False-positive acid-fast smears.
mesh_terms: D001431:Bacteriological Techniques; D046508:Culture Techniques; D003581:Cytodiagnosis; D005189:False Positive Reactions; D006801:Humans; D009169:Mycobacterium tuberculosis / Q000302:isolation & purification; D013183:Sputum / Q000382:microbiology; D014397:Tuberculosis, Pulmonary / Q000382:microbiology