Health experts say the U.S. flu season appears to be waning with two straight weeks of decline in measures of flu activity.

Flu cases and hospitalizations are surging, already breaking last season's records. Here's where activity is highest, what ...

The Influenza A H3N2 virus subclade K represents a change in the basic structure of the influenza virus.

Four-year-old Ellie Rudd – who loved mud and getting dressed up and having dance parties with her brother and sisters – died January 6, after the flu and a co-infection with an adenovirus turned into ...

Despite days in close quarters with flu patients, healthy volunteers didn’t get sick – revealing insights into transmission.

Flu season in the U.S. is particularly bad this year, and a new branch of the flu family tree may be to blame.

A particularly infectious subvariant of influenza is keeping emergency room numbers high and causing especially severe ...

"It's difficult to predict how severe this flu season will be, but we can see year by year the pattern is that it increases with holidays," said Dr. Daived Abboud of Patient First. This trend will ...

Measles has been spreading in the U.S. for a year, a milestone that could mean the virus can no longer be considered ...