Enhanced influenza vaccines impact effectiveness in individuals aged 65 years and older, Denmark, 2024/25 influenza season up to 4 March 2025
Eurosurveillance
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March 27 2025
In Denmark, people aged 65 and older were offered free seasonal influenza vaccination from 1 October to 31 December 2024. For the first time, three different quadrivalent influenza vaccine (QIV) types were available in parallel: a standard-dose QIV, an adjuvanted QIV, and a high-dose QIV. This situation provided a unique opportunity to compare vaccine-type-specific effectiveness (VE) during a high-intensity season dominated by influenza A(H1N1)pdm09 but with substantial co-circulation of A(H3N2).
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