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  2. Severity of influenza illness by seasonal influenza vaccination status among hospitalised patients in four South American countries, 2013–19: a surveillance-based cohort study

Severity of influenza illness by seasonal influenza vaccination status among hospitalised patients in four South American countries, 2013–19: a surveillance-based cohort study

IM-Severity of influenza illness by seasonal influenza vaccination status-en
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Interpretation Influenza vaccination was associated with illness attenuation among those hospitalised with influenza,
although results differed by vaccine target group. These findings might suggest that attenuation of disease severity
might be specific to certain target groups, seasons, or settings. Funding US Centers for Disease Control and Prevention.

Copyright © 2022 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND
4.0 license. Lancet Infect Dis 2022 Published Online October 4, 2022 https://doi.org/10.1016/ S1473-3099(22)00493-5