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

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

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, ...

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

It’s too early to have data on how long most people are sick with subclade K, but Dr. Schaffner says he’s heard anecdotes of ...

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.

About 5,000 people have died of the flu so far this season, including 9 children, as the Trump administration pulls back on ...

Health care providers and public service announcements generally start recommending an influenza vaccination in September and ...