Doctor's visits for flu symptoms are at a 15-year high. Why is this flu season so bad? Doctors discuss flu severity, symptoms and how to stay safe.

If it seems as if everyone is sick, you may be right as the Centers for Disease Control and Prevention said that the flu is surging.

The winter flu season features two types of influenza. Here's what you need to know about them and how they differ.

Flu cases soar across the US; Sacramento sees highest flu-related medical visits since 2009. Learn prevention tips and why vaccination rates matter.

Influenza levels in the US are the highest they've been in 15 years amid winter weather and a second wave of the virus.

Flu infections are at or near their highest levels in at least 15 years and are still rising, the Centers for Disease Control ...

The U.S. winter virus season is in full force, and by one measure is the most intense in 15 years.

A dairy worker in Nevada was infected with a new type of bird flu that’s different from the version that has been spreading ...

Medical experts here in Illinois sat down with the I-Team to explain what they're doing to keep bird flu from becoming the next human pandemic.