Nov 21, 2025 · A new variant of influenza H3N2 is spreading in other countries. But that could mean the U.S. is in for a rough flu season. The mutated strain, known as subclade K, is causing a surge in …

2 days ago · A new strain of the flu is causing concerns for the rest of the winter season. The new strain, called subclade K, has made its way to the U.S. after spreading quickly through countries such as the ...

9 hours ago · A novel H3N2 flu variant, known as subclade K, has made an unexpected early appearance in the US, leading to a spike in infections. While this strain

1 day ago · A mutated flu virus is spreading across the U.S., with 86.8% of recent cases identified as H3N2 subclade K. The flu shot is estimated to be effective against it.

6 days ago · Infectious diseases reporter Helen Branswell discusses this year's vaccine and the new flu strain that's circulating, H3N2 subclade K.

Dec 3, 2025 · A new, highly contagious flu strain called Subclade K is spreading fast, and it could mean we’re in for another severe season. Here's what to know.

1 day ago · With the spread of the new strain, and fewer people getting vaccinated, the flu season could be rough. While the new variant – which emerged too late for it to be incorporated into the current flu …

13 hours ago · Local health officials are alerting the public to a new strain of influenza A that has begun circulating this flu season.

Nov 30, 2025 · As we get deeper into flu season, a new type of the influenza virus has been identified, the Centers for Disease Control and Prevention confirms.

Dec 1, 2025 · A new flu variant called subclade K is gaining attention as doctors warn it could lead to a tougher flu season this winter. The strain, which stems from the influenza A (H3N2) virus, has already ...