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 outbreaks in ...

"As these viruses continue to evolve, public health officials watch carefully to see whether new strains will be more easily ...

Add Yahoo as a preferred source to see more of our stories on Google. A new flu variant known as subclade K is on the rise across the country. Although a spike in this particular strain of influenza, ...

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 ...