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 ...

DALLAS — A new version of the common flu is spreading globally, and health officials are monitoring this evolving strain of influenza A(H3N3) Subclade K, which has been increasingly detected worldwide ...

The US FDA’s vaccine advisors have recommended that three new influenza strains be included in next winter’s influenza vaccine, aiming in part to tamp down illness caused by subclade K, a mutated form ...

Flu season isn't in full swing yet in the United States, but a mutated strain of the virus that has caused severe outbreaks abroad is sparking concern about the winter ahead. A new version of ...

A fast-spreading mutated flu variant that caused severe outbreaks abroad is now the dominant strain in the United States. The so-called "super flu" is surging across the country, sickening millions ...