title: Chronic bronchitis: is bacteriological examination of sputum necessary?
mesh_terms: D000368:Aged; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D001419:Bacteria / Q000302:isolation & purification; D001991:Bronchitis / Q000188:drug therapy / Q000382:microbiology*; D002908:Chronic Disease; D006801:Humans; D008875:Middle Aged; D013183:Sputum / Q000382:microbiology*
chemical_list: D000900:Anti-Bacterial Agents