Influenza is on the rise. Flu activity was "high" or "very high" in 32 states and jurisdictions, as of Dec. 30, according to ...

Is it flu A or flu B, and how long is it contagious? Here's what to know about the flu virus running rampant in New Jersey, ...

Flu continues to visit misery across the US, with all but four states showing high or very high levels of activity as a new virus strain called subclade K continues to spread.

Flu cases are climbing across the United States as the season reaches its peak, and millions of people may get sick in the ...

This year’s influenza virus has been dubbed the “super flu” for how quickly it’s spreading — and how hard it’s hitting.

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 flu strain is surging nationwide. Ohio reports hospitalizations doubling as cases rise. Learn the symptoms and ...

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

At least 14 states and Washington, DC, are seeing high and very high levels of flu, mainly caused by a surprise new influenza mutation called subclade K.

Influenza is on the rise in several states. Here are symptoms to look for if you start feeling under the weather.