title: Antibiotics and purulent sputum.
mesh_terms: D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008297:Male; D010919:Placebos; D012141:Respiratory Tract Infections / Q000188:drug therapy*; D012907:Smoking; D013183:Sputum / Q000382:microbiology*
chemical_list: D000900:Anti-Bacterial Agents; D010919:Placebos