title: Respiratory viral infections in hospital patients with chronic bronchitis. Observations during periods of exacerbation and quiescence.
mesh_terms: D000328:Adult; D000368:Aged; D001991:Bronchitis / Q000150:complications*; D002908:Chronic Disease; D003168:Complement Fixation Tests; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D008875:Middle Aged; D009975:Orthomyxoviridae / Q000302:isolation & purification; D018108:Respirovirus / Q000302:isolation & purification; D014556:Urine / Q000382:microbiology; D014777:Virus Diseases / Q000150:complications* / Q000175:diagnosis / Q000382:microbiology