Viral mismatch between circulating strains and vaccine may have weighed down effectiveness ...

Add Yahoo as a preferred source to see more of our stories on Google. The flu season is ramping up in a big way as an influenza A H3N2 mutation called subclade K drove a near 15% increase in clinical ...

It's winter and with the holidays near, the 2025-2026 flu season has hit the U.S. with flu cases on the rise in New Jersey, with doctors urging those who haven't gotten the flu shot to do so now.

The flu season is ramping up in a big way as an influenza A H3N2 mutation called subclade K drove a near 15% increase in clinical lab tests and a hospitalization rate of 11 people per 100,000, ...