Chemoprophylaxis in chronic bronchitis.
D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D001991:Bronchitis / Q000382:microbiology / Q000517:prevention & control*; D002908:Chronic Disease; D006801:Humans; D013752:Tetracycline / Q000627:therapeutic use
D000900:Anti-Bacterial Agents; D013752:Tetracycline