Most people won’t notice anything different this flu season. Scientists, however, believe this moment could influence vaccine ...

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 early ...

Flu is making people miserable from coast to coast, thanks in large part to a new strain called subclade K. That’s why infectious disease experts are telling people to run, not walk, to get this ...

A fast-moving influenza strain nicknamed the "Super-K" flu is catching the attention of scientists and health authorities. Subclade K, a branch of the H3N2 influenza family, has appeared much ...