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The emergence of the H3N2 subclade K and its impact on vaccine effectiveness
Early real-world data indicate are substantially protective against severe outcomes: estimates from the and international analyses place vaccine effectiveness (VE) against influenza-associated hospita...
The 2025–2026 influenza vaccine provides meaningful protection overall but is an imperfect match against the currently dominant H3N2 subclade K; early estimates show strong protection against severe o...
Early, multi-country data indicate the 2025–2026 seasonal vaccines provide meaningful but imperfect protection against the emergent H3N2 J.2.4.1 (subclade K): strong protection in children (roughly 72...