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

Flu is rising rapidly across the U.S., driven by a new variant of the virus — and cases are expected to keep growing with ...

A variant of influenza A, H3N2, is spreading across the U.S., with low vaccination rates contributing to infection rates.

Flu cases are on the rise significantly in Ohio and Kentucky, and doctors say it’s only a matter of time before West Virginia ...

A highly contagious flu mutation called subclade K is sweeping the nation, raising health concerns about vaccine ...

Hospitals in the Bay Area are reporting more "influenza-like illness," pointing to a mutation in the strain. Medical experts ...

Three counties across the Palm Beaches and Treasure Coast are seeing a surge in cases. Health officials pointing to lower ...

There are some unusual symptoms being reported with a new and mutated flu variant quickly spreading in the U.S. ahead of ...

Current data from the CDC suggests the H3N2 strain and subvariant K — the dominant subvariant in the U.S. — are more ...

Much of the concern this flu season is coming from the spread of subclade K, a subtype of influenza A. Similar subtypes have ...

A variant strain of the coronavirus, one that was first discovered in the United Kingdom, is now the dominant strain of the virus circulating throughout the United States, CDC Director Rochelle ...