After a sharp uptick in flu cases in mid-December 2025, flu activity across the U.S. and Canada remains high.
WASHINGTON (AP) - 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 ...
The spike in flu cases widely referred to in media reports as a "superflu" is largely driven by a newly identified subtype of ...