The number of people getting sick with influenza B has gone up for three weeks straight, now making up about a third of flu cases nationwide.

Oregon has landed itself in the CDC’s worst tier for flu activity, as have six other states. Arkansas, Kansas, Louisiana, ...

A ferocious surge in influenza cases is linked in part to a variant that has not been dominant in the past few years — resulting in a waning of natural immunity. As millions of bedridden people can ...

Early estimates cited by the World Health Organization suggest that seasonal influenza vaccines continue to protect against severe illness and hospitalization in both children and adults. iStock A new ...