The Influenza A H3N2 virus subclade K represents a change in the basic structure of the influenza virus.

Add Yahoo as a preferred source to see more of our stories on Google. The new flu variant, H3N2 subclade K, is a mutation of the common flu A subtype, which is often the flu "going around" come late ...

WASHINGTON (AP) — Flu is rising rapidly across the U.S., driven by a new variant of the virus — and cases are expected to keep growing with holiday travel. That variant, known as “subclade K,” led to ...

On December 18, 2025, experts published an article in JAMA Network warning that a severe type of influenza A(H3N2) virus may become common this season. The H3N2 flu virus first emerged in 1968, and in ...

Learn more about seasonal flu, including where to get a flu vaccine and how to treat seasonal flu.

Over 160,000 people this season have landed in the hospital from flu complications, CDC estimates. More than 6,600 have died. Here's the symptoms.

WASHINGTON (AP) - Flu is rising rapidly across the U.S., driven by a new variant of the virus — and cases are expected to keep growing with holiday travel. That variant, known as “subclade K,” led to ...