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Vaccine effectiveness (VE) of 2023 autumnal monovalent XBB.1.5 vaccination against hospitalisation due to COVID‐19 in seven European VEBIS‐EHR study sites and pooled estimate using either fixed‐effects or random‐effects meta‐analysis. (a) In the group aged 65–79 years; (b) in the group aged 80 years and older, October to November 2023.
