Is clinical recognition of respiratory syncytial virus infection in hospitalized elderly and high-risk adults possible?

Abstract

Background. The clinical and radiographic features of respiratory syncytial virus (RSV) infection in elderly hospitalized persons have not been described in detail, to our knowledge, despite its relative frequent occurrence. Methods. Clinical characteristics of 132 RSV infections were compared with 144 influenza A virus infections and with all non-RSV infections in elderly and high-risk persons admitted to the hospital with acute respiratory illness. Radiographic findings were categorized for RSV-infected persons. Results. RSV was more commonly associated with nasal congestion (68% vs. 55%; P = .03), wheezing by history (73% vs. 53%; P = .002) and on examination (82% vs. 68%; P = .02), and lower temperature (P = .004) than influenza A virus. Compared with all non-RSV-infected subjects, nasal congestion (odds ratio [OR], 2.0 [95% confidence interval {CI}, 1.3-2.9]), wheezing on examination (OR, 1.8 [95% CI, 1.2-2.8]), and temperature >37.9°C (OR, 1.6 [95% CI, 1.1-2.4]) were independent predictors of RSV infection, although their sensitivity and specificity were poor. New radiographic infiltrates were seen in approximately half of RSV-infected persons, and pneumonic opacities were typically small and unilateral. Conclusions. Although RSV causes a different clinical syndrome than influenza A virus, it is not readily differentiated on clinical grounds from influenza A nor from all non-RSV illnesses in elderly patients. © 2007 by the Infectious Diseases Society of America. All rights reserved.