One type mutates often and causes seasonal pandemics. The other one doesn't. Here's what else is different.

All viral activity benchmarks have gone down, except for a slight increase in the death rate. Here's what to know about the state of the flu season.

Vaccines still are effective in decreasing the possibility of hospitalization associated with this season's "super flu," ...

Add Yahoo as a preferred source to see more of our stories on Google. The new flu variant, H3N2 subclade K, is a mutation of the common flu A subtype, which is often the flu "going around" come late ...

The U.S. is facing its worst flu season in 25 years, according to the Centers for Disease Control and Prevention, which ...

Flu activity in Michigan is considered "very high," according the latest report from the U.S. Centers for Disease Control and ...

Amid a severe flu season, the CDC ends its universal flu shot recommendation for kids. Experts explain why this is dangerous ...

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 ...

Is this flu season actually worse than usual? Experts and readers weigh in. The post Massachusetts residents describe a ...

The 2025-2026 flu season is surging in the U.S. and New Jersey, where there's been increased severity of influenza A, with further testing from the CDC showing many NJ residents have the emerging ...