Subclade K has become the dominant form of flu and is slightly different from the virus targeted by this year’s flu vaccine.

A new form of the flu, which is highly contagious and aggressive, is sweeping the nation this season. A mutation of influenza ...

Known as subclade K, a new, mutated flu strain that has dominated in Europe and Asia is now rapidly spreading across the US.

A more severe and highly contagious new strain of the flu is circulating this season. It's called subclade K, or more ...

A new strain called H3N2 subclade K has emerged, raising concerns that the body may not be able to fight it off as well.

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

Health officials say flu activity is ramping up across Northern Nevada, and a new strain could be contributing to that number ...

Last year’s flu season was the roughest in nearly a decade. “We generally don’t have two bad flu seasons back to back,” said ...

NASHVILLE, Tenn. (WSMV) - Flu cases have doubled over the past month as a new aggressive strain spreads across the country, ...

Viruses can change and alter their genetic make-up. When these changes occur, the virus may become more or less of a threat to the human host. Virologists are therefore interested in tracking the ...

Ballad Health is requiring staff to wear a mask and instituting new restrictions on visitors in response to a surge in flu ...