title: A comparison of erythromycin, novobiocin, tetracycline and a novobiocin-tetracycline combination in purulent exacerbations of chronic bronchitis.
mesh_terms: D000328:Adult; D000368:Aged; D001991:Bronchitis / Q000000981:diagnostic imaging / Q000188:drug therapy*; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D004357:Drug Synergism; D004917:Erythromycin / Q000627:therapeutic use*; D006193:Haemophilus influenzae / Q000302:isolation & purification; D006801:Humans; D007958:Leukocyte Count; D008168:Lung / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009675:Novobiocin / Q000009:adverse effects / Q000627:therapeutic use*; D011859:Radiography; D013147:Spirometry; D013183:Sputum / Q000382:microbiology; D013291:Streptococcus / Q000302:isolation & purification; D013752:Tetracycline / Q000627:therapeutic use*
chemical_list: D009675:Novobiocin; D004917:Erythromycin; D013752:Tetracycline