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 two players every flu season: influenza Type A and Type B. Influenza A tends to pop up early in the season and accounts for more than 75 percent of all cases, while influenza B typically ...

National data from the U.S. Centers for Disease Control and Prevention also show influenza type A making up the majority of ...

For the week ending Feb. 1, Wisconsin Department of Health Services data show influenza activity is ... severe — flu strains are A and B, the CDC says. Type A is known to cause more severe ...