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

The flu can also cause a general feeling of fatigue or malaise, Ray says, as well as gastrointestinal issues like diarrhea ...

But what does it mean to have a flu A or flu B season? Do these types of flu have different symptoms? And does one cause more severe illness than the other? Experts have been studying influenza ...

While we often refer to it as "the flu," the influenza virus has several strains, with flu A and flu B considered the most ...

What does it mean to have flu A or flu b this season, and do these types of flu have the same symptoms? Here's what to know about the flu viruses. This pie chart shows the number of flu cases ...

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

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

New Mexico, Texas and Nebraska are among the states with the highest number of people showing flu-like symptoms.

It's flu season right now, and the U.S. is in the midst of a wave that's straining hospitals. But not all influenza is the same. There are some notable differences between flu A and flu B strains.

But what does it mean to have a flu A or flu B season? Do these types of flu have different symptoms? And does one cause more severe illness than the other? Experts have been studying influenza ...