COVID-19 variant XFG accounted for 0% of U.S. cases in May. By late-June, it became the third-most common strain.

Add Yahoo as a preferred source to see more of our stories on Google. A new flu strain with climbing cases across the county is garnering the attention of health experts nationwide, with cases in ...

Add Yahoo as a preferred source to see more of our stories on Google. Getty Images An alleged warning has spread online for years about a supposed "new COVID-Omicron XBB variant" — a new strain of the ...

FILE - A certified medical assistant holds a syringe for a flu vaccine at a clinic in Seattle, on Wednesday, Sept. 10, 2025. (AP Photo/Lindsey Wasson, File) (Lindsey ...

With another potential COVID-19 surge looming, experts are turning their attention to a pair of new variants that are steadily spreading: BQ.1 and BQ.1.1. Both BQ.1 and BQ.1.1 descended from BA.5, an ...

A new form of the flu, which is highly contagious and aggressive, is sweeping the nation this season. A mutation of influenza A H3N2, called subclade K, has been detected as the culprit in rising ...

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 ...