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A new flu strain spreading in the UK, Japan, and North America is causing severe illness, especially in older adults, but the 2025–26 vaccine remains effective.
A new flu variant, H3N2 subclade K, is spreading in the UK, Japan, and North America, with the UK experiencing an early and severe flu season.
Not included in this year’s vaccine, the genetically distinct strain may partially evade prior immunity and is linked to more severe illness, especially in older adults.
Despite these concerns, early data shows the 2025–26 flu vaccine remains effective—70% to 75% in children and 30% to 40% in adults—within typical ranges.
Health officials continue to urge vaccination as the best protection against serious outcomes.
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Una nueva cepa de gripe que se propaga en el Reino Unido, Japón y América del Norte está causando enfermedades graves, especialmente en adultos mayores, pero la vacuna 2025 26 sigue siendo efectiva.