Fig. 2.

Overall, influenza A, A(H3N2), A(H1N1)pdm09 and B vaccine effectiveness** among study sites collecting information on symptoms and recruiting patients meeting the EU ARI case definition, study on effect of case definition on influenza vaccine effectiveness, VEBIS primary care multicentre case-control study, EU/EEA, 2022–23. **VE estimates were based on a complete case analysis and records with missing data for covariates were dropped. These VE results are a subset of the data and should not be used as the main reference for VEBIS primary care influenza VE within the 2022–23 season.