A new flu variant, subclade K, is driving an uptick in cases across the U.S. and prolonging influenza seasons in other parts of the world.

After a sharp uptick in flu cases in mid-December 2025, flu activity across the U.S. and Canada remains high.

Flu is rising rapidly across the U.S., driven by a new variant of the virus. The Centers for Disease Control and Prevention reported Tuesday that after a slow start to flu season in early December, ...

A ferocious surge of flu cases is linked in part to a variant that has not been dominant in the past few years — resulting in ...

A new flu strain has been detected, with the variant dubbed influenza A subclade K. How severe is the strain and does the ...

Flu cases and hospitalizations are surging, already breaking last season's records. Here's where activity is highest, what ...

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, ...

The Centers for Disease Control and Prevention listed the COVID-19 delta variant as one of its "variants of concern" (VOCs) on June 15. According to the CDC, VOCs can be more contagious, more ...

The arrival of agriculture coincided with a sharp rise in a gene variant that protected against the virus that causes winter vomiting, researchers from Karolinska Institutet and Linköping University ...

It's been less than a month since health officials reported the first known case of a new and more contagious coronavirus variant in Texas. The man, a Harris County resident, had no travel history.