title: Incidence of niacin negative Mycobacterium tuberculosis strains.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D004352:Drug Resistance, Microbial; D014644:Genetic Variation; D009169:Mycobacterium tuberculosis / Q000187:drug effects / Q000378:metabolism*; D009539:Nicotinic Acids / Q000096:biosynthesis*
chemical_list: D000900:Anti-Bacterial Agents; D009539:Nicotinic Acids