Subclade K, a variant of the influenza A strain H3N2, is being detected in the U.S. This is the same variant that experts say ...

The variant is known as influenza A subtype H3N2 subclade K–sometimes called “subclade K” for short—and it has been detected ...

A new strain of the flu called subclade K could make for a particularly nasty flu season across the country, according to ...

There are reports of this strain of the flu causing more severe illness, and early data suggest that protection against the flu from previous infections or the vaccine is “suboptimal,” according to ...

A new influenza A strain subclade K is circulating due to H3N2 picking up 7 mutations this Summer. Will this lead to a worse ...

The mutated strain, known as subclade K, is causing a surge in cases in the United Kingdom, Canada, and Japan. Here's what to know.

A new and potentially more severe variant of the flu, known as H3N2 subclade K, has reached the United States, prompting heightened vigilance from public health officials as the holiday season and ...

Massachusetts could be headed for a sharp uptick in flu cases in the coming weeks, public health experts warn, as a newly ...

The United States may be heading into its second severe flu season in a row, driven by a mutated strain called subclade K ...

Last winter, for the first time since Covid-19 entered our world, influenza reclaimed its spot as the worst actor among the cast of viruses that sicken people during the cold and flu season. The ...

An unexpected mutation of the H3N2 influenza A virus is driving up case counts abroad, and experts are concerned it could ...

Earlier this month, a group of Canadian researchers published early influenza data for the 2025-26 season, issuing a warning: ...