Clinical Disease Severity of Respiratory Viral Co-Infection versus Single Viral Infection: A Systematic Review and Meta-Analysis

• Published in: PloS one Vol. 9; no. 6; p. e99392
• Main Authors: Asner, Sandra A., Science, Michelle E., Tran, Dat, Smieja, Marek, Merglen, Arnaud, Mertz, Dominik
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 16.06.2014; Public Library of Science (PLoS)
• Subjects: Adolescent; Adult; Aged; Bias; Child; Child Mortality; Child, Preschool; Children; Coinfection - epidemiology; Humans; Illnesses; Infant; Infection; Infections; Intensive Care Units - statistics & numerical data; Length of Stay - statistics & numerical data; Medicine and Health Sciences; Meta-analysis; Middle Aged; Mortality; Mortality risk; Observational studies; Observational Studies as Topic - statistics & numerical data; Observer Variation; Oxygen; Oxygen requirement; Oxygen requirements; Preschool children; Quality; Respiratory diseases; Respiratory Tract Infections - epidemiology; Subgroups; Systematic review; Viral infections; Virulence; Virus Diseases - epidemiology; Viruses; Young Adult
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0099392

Results from cohort studies evaluating the severity of respiratory viral co-infections are conflicting. We conducted a systematic review and meta-analysis to assess the clinical severity of viral co-infections as compared to single viral respiratory infections. We searched electronic databases and other sources for studies published up to January 28, 2013. We included observational studies on inpatients with respiratory illnesses comparing the clinical severity of viral co-infections to single viral infections as detected by molecular assays. The primary outcome reflecting clinical disease severity was length of hospital stay (LOS). A random-effects model was used to conduct the meta-analyses. Twenty-one studies involving 4,280 patients were included. The overall quality of evidence applying the GRADE approach ranged from moderate for oxygen requirements to low for all other outcomes. No significant differences in length of hospital stay (LOS) (mean difference (MD) -0.20 days, 95% CI -0.94, 0.53, p = 0.59), or mortality (RR 2.44, 95% CI 0.86, 6.91, p = 0.09) were documented in subjects with viral co-infections compared to those with a single viral infection. There was no evidence for differences in effects across age subgroups in post hoc analyses with the exception of the higher mortality in preschool children (RR 9.82, 95% CI 3.09, 31.20, p<0.001) with viral co-infection as compared to other age groups (I2 for subgroup analysis 64%, p = 0.04). No differences in clinical disease severity between viral co-infections and single respiratory infections were documented. The suggested increased risk of mortality observed amongst children with viral co-infections requires further investigation.