Partial CDC data suggest that influenza deaths may have already reached as high as 2% of deaths for the week ending on Feb. 1 ...

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.

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.

CNN’s Dr. Sanjay Gupta discusses the severity of the flu season in the US and how people can protect themselves.

More than 24 million people have had seasonal flu this season, according to estimates from the Centers for Disease Control ...

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

Flu A and flu B are two different strains of influenza, explains Thomas Russo, M.D., professor and chief of infectious ...