There’s a new flu variant circulating this year. Here are 5 takeaways

As flu cases rise across Florida and the U.S., a new variant, known as subclade K, is causing concern among health experts. This variant of the influenza A strain H3N2 is contributing to a severe flu season, with increased hospitalizations and deaths.

FULL STORY: A new flu variant is circulating. What to know about influenza in Florida

Here are the highlights:

• Subclade K, a mutated form of H3N2, is driving many of the flu cases in the U.S. this season. It has mutations that may allow it to evade some vaccine protections, though the current flu vaccine still offers some defense.
• Flu activity varies by state, but overall, more people are testing positive, and flu-related ER visits are increasing. In Florida, many counties, including Miami-Dade, are reporting rising flu cases.
• The 2025-2026 flu vaccine is designed to protect against three main viruses, including H3N2. Despite the emergence of subclade K, the vaccine is expected to reduce the risk of severe illness and hospitalization.
• Other respiratory viruses, such as RSV and COVID-19, are also circulating, with RSV activity increasing in some regions. Florida’s RSV season typically lasts longer, impacting young children and older adults.
• To avoid getting sick, experts recommend boosting the immune system through rest, nutrition and hydration, along with vaccination. Practicing good hygiene and avoiding sick individuals are also key preventive measures.

The summary points above were compiled with the help of AI tools and edited by journalists in the Miami Herald newsroom. The full story in the link at top was reported, written and edited entirely by Miami Herald journalists.