A mutated strain of influenza A, H3N2 subclade K, is surging worldwide, sparking concern about a severe flu season in the U.S. Here's what to symptoms to look out for.

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

Add Yahoo as a preferred source to see more of our stories on Google. It's flu season in Massachusetts, and most sick Bay Staters are coming down with Influenza Type A, according to recent health data ...

This flu season has been harsh. As of Dec. 27, there have been 11 million reported cases, 120,000 hospitalizations, and 5,000 deaths nationwide. The latest numbers have gone up so much that the CDC is ...

The flu epidemic continues to go down. The positivity rate and other benchmarks for the week ending on Jan. 24 have dropped ...

It's flu season right now, and the U.S. is in the midst of a wave that's straining hospitals. But not all influenza is the same. There are some notable differences between flu A and flu B strains. On ...

As seasonal influenza cases continue to spike across the globe, experts are warning that multiple respiratory viruses and bacterial Infections, beyond H3N2, may be circulating simultaneously.

Flu is rising rapidly across the U.S., driven by a new variant of the virus — and cases are expected to keep growing with holiday travel. That variant, known as “subclade K,” led to early outbreaks in ...