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 Michigan.

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

This year, the most prevalent variant is subclade K, which is a subtype of influenza H3N2. Subclade K was first detected in ...

Subclade K, which is circulating in Arizona, has been dubbed a 'super flu' but some experts say that's not an accurate ...

Flu season in the U.S. is particularly bad this year, and a new branch of the flu family tree may be to blame.

Flu activity continues to remain elevated across the U.S. with at least 18 million cases, according to newly released data ...

Influenza cases are down across the United States, but a new flu strain mutation identified in August is causing a spike in ...

At least 11 million people have gotten sick, and 5,000 people have died from the flu this season, including nine children.

Flu cases continue to climb nationwide, with the majority stemming from the new subclade K strain dubbed the "super flu." ...

As flu cases rise in San Diego and a new strain emerges, health officials urge vaccinations. Is the vaccine the shield we ...