Ny influensamutation sprider sig – kan påverka vaccinets effekt

En ovanlig mutation i influensaviruset H3N2, kallad K, har kopplats till en tidig start på årets influensasäsong i flera länder. Varianten har nu identifierats även i Sverige och tros kunna påverka hur effektivt immunförsvaret och vaccinet skyddar.

By Ella Käck

November 19, 2025 10:52 AM

Influensavirus förändras ständigt, men i juni identifierade forskare en grupp större mutationer i en H3N2-stam – något som sällan sker mitt i sommaren.

Forskare i Storbritannien och Japan rapporterar att säsongen dragit igång tidigare än vanligt och att den aktuella H3N2-varianten kan vara en förklaring. H3N2 har historiskt varit den influensatyp som främst drabbar äldre och riskgrupper.

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