Long-term prophylactic administration of tetracycline to chronic bronchitics.
D000900:Anti-Bacterial Agents; D001991:Bronchitis / Q000628:therapy*; D006801:Humans; D008134:Long-Term Care; D013752:Tetracycline / Q000627:therapeutic use*
D000900:Anti-Bacterial Agents; D013752:Tetracycline
BRONCHITIS/therapy; TETRACYCLINE/therapeutic use