A G155E-mutated H1N1 strain is driving an early U.S. flu surge. Early data suggest the updated vaccine still offers ...

Experts say this year’s flu shot still offers substantial protection against hospitalization.

Flu season is picking up months ahead of schedule with a mutated virus spreading in some parts of the United States.

It's only October, but emergency room visits from the flu have already spiked, in part due to a new variant that affects people under the age of 25 the most.

An early West Coast flu surge and a new H1N1 mutation (G155E) may leave younger people less protected. Doctors urge everyone ...