A ferocious surge of flu cases is linked in part to a variant that has not been dominant in the past few years — resulting in ...

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

The CDC estimated there have been at least 7.5 million illnesses in the U.S., 81,000 hospitalizations and 3,100 deaths from ...

The California Department of Public Health on Tuesday confirmed that a mutated strain of influenza is spreading across the ...

As the seasonal flu picks up, there are even more opportunities for the bird flu to acquire mutations as the different influenza viruses mix. A 13-year-old girl in British Columbia who was ...

A late-emerging influenza A mutation known as subclade K weakened protection, but doctors say vaccination still reduces ...

Have you ever wondered why you have to get a flu shot every year, but some vaccines are one-and-done? It all has to do with how and how fast viruses evolve - and that depends on mutation rates.

At least 11 million people have gotten sick, and 5,000 people have died from the flu this season as vaccination rates wane: ...

California officials warn of increase in flu-related hospitalizations and confirm second severe-flu-related death.

Even as doctor visits and hospitalizations from the flu decreased, an additional 15 children died last week. Doctors caution ...

Flu is rising rapidly in the U.S, with cases reaching "very high" levels in Missouri, according to the Centers for Disease ...

This year's flu season is shaping up to be particularly brutal. Here's what to know this week, including cases taking a ...