‘Superflu’ H3N2 K-Strain: Symptoms, Vaccine Protection and How the New Flu Variant Is Hitting Hospitals This Winter
A/H3N2 subclade K, known as the “K-strain,” now makes up about 90% of flu samples in the UK and Japan and has been found on every continent. NHS leaders in London report hospital flu admissions have tripled from last year, with no sign of a peak. Early data indicate this season’s flu vaccine remains strongly protective against severe illness.