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End-of-season influenza vaccine effectiveness during the Southern Hemisphere 2022 influenza season –Chile, Paraguay, and Uruguay

IM-revelac-End-of-season-flu vaccine-chl-pry-ury-2022-en
https://doi.org/10.1016/j.ijid.2023.05.015

This study estimated the 2022 end-of-season influenza vaccine effectiveness (VE) against se- vere acute respiratory illness (SARI) hospitalization in Chile, Paraguay, and Uruguay.

Highlights:
• Seasonal influenza viruses typically circulate in South America from April-November.
• Among those vaccinated in 2022, the odds of influenza hospitalization were 1/3 lower.
• Vaccine effectiveness was higher in the early season than in the late season.
• Health officials should encourage communities to seek influenza vaccination.

© 2023 Published by Elsevier Ltd on behalf of International Society for Infectious Diseases. This is an open access article under the CC BY-NC-ND IGO license