K Strain Flu: Mutated H3N2 Virus Is Circulating; Health Officials Say It Is Never Too Late To Get Vaccinated

k strain h3n2 flu vaccine k strain flu symptoms k strain of flu super flu vaccine flu vaccine k flu

Credits: Canva

Text

Updated Dec 10, 2025 | 10:01 AM IST

SummaryExperts warn of an early, severe flu season driven by H3N2 subclade K, or “super flu,” which is spreading rapidly due to low immunity. The NHS urges vulnerable groups to get vaccinated, noting the jab offers good protection. Doctors advise everyone to get the flu shot and follow basic infection-control measures.

End of Article