title: Chronic bronchitis: Part I. A bacteriological study of acute exacerbation.
mesh_terms: D000328:Adult; D000368:Aged; D001419:Bacteria / Q000302:isolation & purification*; D001991:Bronchitis / Q000382:microbiology*; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013183:Sputum / Q000382:microbiology