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.

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 and Prevention says.

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

Respiratory illnesses have left thousands of Kentuckians sick and others dead. Here are the latest numbers and what you can do to say healthy.

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

One in every three flu tests came back positive last week, according to the Centers for Disease Control and Prevention.

There's also one big difference between the flu and COVID or a cold that can indicate which illness you have. Don't ignore it ...

Flu activity remains “very high” in most states, the Centers for Disease Control said this week, as illnesses, emergency room visits and hospitalizations all continue to trend upward.

Despite the severity of this flu season, vaccination rates have remained consistent with previous years, according to the CDC ...