Respiratory syncytial virus (RSV) is increasingly recognized as a significant cause of adult respiratory illness. We evaluated routine viral testing and discharge diagnoses for identifying RSV and influenza burden. Polymerase chain reaction results performed in adults during emergency room visits or hospitalizations were reviewed. Peak RSV activity preceded influenza activity by 8 weeks. The ratio of total number of viral tests performed divided by total number of respiratory visits was higher during influenza than RSV peaks (1.31 vs 0.72; P = .0001). Influenza and RSV were listed primary diagnoses in 56 (30%) vs 7 (6%), respectively (P < .0001). Routine viral testing to estimate adult RSV disease burden has limitations.
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