Background Viral pathogens were more commonly reported than previously estimated in community-acquired pneumonia (CAP) patients. However, the real role of virus was still controversial. Methods Consecutive adult patients with CAP between April and December, 2009 were prospectively enrolled. A four-fold or greater increase of IgG-titres against respiratory viruses in pair sera was tested by means of hemagglutination inhibition assay or indirect immunofluorescence. Swab samples were tested by cell culture and/or nucleic amplification tests. Viral etiology was considered definitive if at least one of the above tests was positive. Results Viral etiology was established in fifty-two (34.9%) of 149 CAP patients, twenty-two (81.5%) of 27 influenza like illness patients, and none of 75 volunteer controls. Forty-seven CAP patients were infected by a single virus (24 influenza A virus, 5 influenza B, 10 parainfluenza virus type 3 [PIV-3], 2 PIV-1, 2 adenovirus, 2 human rhinovirus and 2 coronavirus OC43), five cases by two or three viruses co-infection. Fever ≥ 39°C (66.7%), fatigue (64.6%), and purulent sputum (52.1%) was the most common symptoms in viral pneumonia patients. On multivariate analysis, myalgia was included in the model for pneumonia associated with influenza infection. In the CURB-65 model only influenza infection was found independently associated with severe disease (CURB-65 score ≥ 3) out of variables, including age(years), sex, current smoking status, sick contact with febrile patients, numbers of comorbidity, presence of influenza infection, presence of PIV infection, with P = 0.021, OR 7.86 (95% CI 1.37-45.04). Conclusion Respiratory virus was not a bystander, but pathogenic in pneumonia and was a common cause of CAP.
【저자키워드】 Seroconversion, Cell culture, viral disease, clinical feature, community-acquired pneumonia, 【초록키워드】 coronavirus, fatigue, Pneumonia, Infection, influenza A virus, Comorbidity, Sex, Symptom, sputum, virus, Adenovirus, amplification, pathogen, CURB-65, sera, Patient, Co-infection, influenza like illness, immunofluorescence, respiratory, parainfluenza virus, etiology, influenza B, smoking status, patients, OC43, Febrile patients, Analysis, severe disease, Contact, myalgia, bystander, 95% CI, influenza infection, pathogenic, positive, Human rhinovirus, FIVE, controls, Result, greater, enrolled, tested, were infected, virus, respiratory virus, reported, in viral, sick, variables, was tested, 【제목키워드】 virus, pathogen, Control, influenza like illness, respiratory,