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. 2022 Dec 30;11(1):83. doi: 10.3390/vaccines11010083

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Effectiveness of the 2021/22 seasonal influenza vaccination against severe acute respiratory infection. ^a Covariates (age, area, month of symptom onset, COVID-19 vaccination pattern and previous season influenza vaccination) selected on the basis of minimization of the corrected Akaike’s information criterion; ^b Fully adjusted (age, sex, area, month of symptom onset, swab delay, presence of chronic conditions, COVID-19 vaccination pattern, and previous season influenza vaccination) model.