Categories
October Surprise 2024

ā€˜Superflu’ H3N2 K-Strain: Symptoms, Vaccine Protection and How the New …

Published: 9 December 2025 A heavily mutated flu strain — A/H3N2 subclade K, often dubbed the ā€œK-strainā€ or ā€œsuperfluā€ — is now dominating the 2025–26 flu season and driving record levels of illness in parts of the UK and beyond. On Tuesday, new analysis showed that this K-strain now accounts for around 90% of flu samples in the UK and Japan and has been detected on every …