bioRxiv / medRxiv
open access
Protective effect of influenza vaccine in Brazilian patients hospitalised for severe acute respiratory infection, 2023-2025
IntroductionDespite a significant increase in influenza burden in Brazil in 2025, influenza vaccine effectiveness has not included the key end-of-winter period so far. Methods: The key exposure measure was the number of trivalent influenza vaccine doses received within a calendar year. In-hospital m
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