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.

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

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

Americans are being urged to be extra vigilant this winter, as a suite of influenza A mutations has created a dominant virus ...

A late-emerging influenza A mutation known as subclade K weakened protection, but doctors say vaccination still reduces ...

While vaccines may not fully protect everyone, public health experts say they’re still proven to help prevent serious illness ...

Have you been sick since the new year started? You're not alone; here's what to know about new H3N2 flu strain and its ...

Much of the country is facing record flu cases thanks to a new strain of the virus. And the "subclade K" variant is likely ...

Hospitalizations rose more than 60 percent, from 49,000 to 81,000, and deaths this season have topped 1,200.Twenty‑nine ...

The latest federal data shows Florida is now in the top tier of “very high” flu activity. Here's the four reasons why.

This year's flu season is shaping up to be particularly brutal. Here's what to know this week, including cases taking a ...

New York’s health department said the week ending Dec. 20 marked the most flu cases the state had recorded in a single week ...