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Risk of Influenza-Like Illness in an Acute Health Care Setting During Community Influenza Epidemics in 2004-2005 2005-2006 and 2006-2007

Abstract : Background: The person-to-person transmission of influenza-like illness (ILI) and influenza has been described mostly in long-term care units. Studies in acute hospital settings are rare and mostly retrospective. Methods: We prospectively estimated the relative risk (RR) of hospital-acquired (HA) ILI during hospitalization according to in-hospital exposures to contagious individuals. Surveillance of ILI and laboratory-confirmed influenza was undertaken at Edouard Herriot Hospital (1100 beds) during 3 influenza seasons. A total of 21 519 patients and 2153 health care workers (HCWs) from 2004 to 2007 were included. The RR of HA-ILI in patients was calculated according to exposure to other contagious patients and HCWs. Results: For patients exposed to at least 1 contagious HCW compared with those with no documented exposure in the hospital, the RR of HA-ILI was 5.48 (95% confidence interval [CI], 2.09-14.37); for patients exposed to at least 1 contagious patient, the RR was 17.96 (95% CI, 10.07-32.03); and for patients exposed to at least 1 contagious patient and 1 contagious HCW, the RR was 34.75 (95% CI, 17.70-68.25). Conclusions: Hospitalized patients exposed to potentially infectious patients and HCWs with ILI inside the hospital are at greater risk for HA-ILI. Such results identify priorities regarding preventive measures for seasonal or pandemic influenza.
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https://hal.archives-ouvertes.fr/hal-00698295
Contributor : Stéphane Delmotte Connect in order to contact the contributor
Submitted on : Wednesday, May 16, 2012 - 2:20:35 PM
Last modification on : Monday, April 11, 2022 - 8:21:57 AM

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Philippe Vanhems, N. Voirin, S. Roche, V. Escuret, C. Regis, et al.. Risk of Influenza-Like Illness in an Acute Health Care Setting During Community Influenza Epidemics in 2004-2005 2005-2006 and 2006-2007. Archive of Internal Medicine, 2011, 171 (2), pp.151-157. ⟨10.1001/archinternmed.2010.500⟩. ⟨hal-00698295⟩

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