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

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

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 ...

The views expressed in this commentary are solely those of the writer. CNN is showcasing the work of The Conversation, a ...

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

Cases of the flu continue to rise nationwide and now appear to be higher than they've been in at least three decades, ...

The newer variant of avian influenza that recently infected dairy cattle in Nevada has a genetic change that’s thought to ...

NEW YORK (AP) — The U.S. winter virus season is in full force, and by one measure is the most intense in 15 years.

Flu activity is at its highest level since 2009, forcing school closures and overwhelming hospitals across the U.S.