The level of flu varies by state. But overall, more people have recently tested positive for influenza, with flu-related ...

They are bracing for a brutal season, driven by a new and alarming variant that is expected to circulate widely.

A Twin Cities metro area school shifted to e-learning after a flu outbreak impacted nearly a quarter of its students. A ...

A flu shot is prepared for a patient at a doctor's office in Coral Gables, Fla., in September. A new flu variant is causing an early uptick in cases across the country, particularly in New York, ...

Known as subclade K, a new, mutated flu strain that has dominated in Europe and Asia is now rapidly spreading across the US.

Flu season is starting to ramp up as the U.S. settles into the colder weather months and indoor gatherings potentially fuel the spread of viruses.

Flu season is getting an early start in New York City, with doctors reporting a sharp jump in cases weeks sooner than normal.

Flu season has begun weeks early in New York City, with cases rising sharply and schools closing due to widespread illness.

Experts say there is no evidence to suggest the 'subclade K' flu strain causes more severe illness than previous H3N2 viruses ...

Early December is also when flu hospitalizations began to increase in Wisconsin last year – and the state went on to log one of its worst flu seasons in the past decade. Between lagging vaccination ...

Hospitals are preparing for a slump in activity as up to half of the medical workforce in England could stop working after ...

Researchers are striving to understand the impact a phenomenon known as original antigenic sin has on immunity to the virus.