How bad will the 2025-2026 flu season be? The exact timing, duration and severity of flu seasons vary each year and can only really be understood in retrospect, explains Robert Amler, MD, MMS, MBA, ...

Can the flu shot cause the flu? You may be tempted to skip your flu shot this season because of scheduling issues, a fear of needles or another reason. But misconceptions and misinformation — ...

Every year, flu vaccines are updated to match the flu viruses expected to circulate. For 2026, the vaccine focuses on several influenza strains that research predicts will be most prevalent. This ...

Influenza A H3N2 subclade K has driven flu cases across the country, with 52 counties in Florida seeing increases over the past week. While the current flu vaccine might be a "mismatch," it still ...

Flu is making people miserable from coast to coast, thanks in large part to a new strain called subclade K. That’s why infectious disease experts are telling people to run, not walk, to get this ...

The United States is facing one of its most severe flu seasons in decades, data show. Infections and hospitalizations are surging, driven by a new mutated influenza A variant, H3N2 "subclade K." ...