title: The role of bacterial and viral infection in chronic bronchitis.
mesh_terms: D000328:Adult; D000368:Aged; D000397:Air Pollution; D001987:Bronchiectasis / Q000150:complications; D001991:Bronchitis / Q000209:etiology* / Q000473:pathology; D002908:Chronic Disease; D003371:Cough / Q000150:complications; D004417:Dyspnea / Q000150:complications; D004781:Environmental Exposure; D005260:Female; D006192:Haemophilus Infections / Q000150:complications; D006193:Haemophilus influenzae / Q000302:isolation & purification; D006801:Humans; D008297:Male; D008875:Middle Aged; D011008:Pneumococcal Infections / Q000150:complications; D012136:Respiratory Syncytial Viruses / Q000302:isolation & purification; D012229:Rhinovirus / Q000302:isolation & purification; D012907:Smoking; D013147:Spirometry; D013183:Sputum / Q000382:microbiology; D013296:Streptococcus pneumoniae / Q000302:isolation & purification; D014777:Virus Diseases / Q000150:complications*