4 days ago · A new influenza A subtype called subclade K is pushing infection rates up, but the flu shot still offers significant protection.

Dec 17, 2025 · Known as subclade K, a new, mutated flu strain that has dominated in Europe and Asia is now rapidly spreading across the US.

1 day ago · New flu strain emerging as a severe health threat A mutation of influenza A H3N2, called subclade K, is hitting Americans hard this flu season.

Dec 18, 2025 · A new version of the common flu is spreading globally, and health officials are monitoring this evolving strain of influenza A(H3N3) Subclade K, which has been increasingly detected worldwide.

Dec 16, 2025 · There’s a new flu variant in town, and it ain’t pretty. A mutated form of the influenza A strain H3N2 known as subclade K is causing a severe flu season in multiple countries across the …

Dec 19, 2025 · A fast-spreading strain of influenza A (H3N2), known as subclade K, has fuelled headlines warning of a possible “superflu”. The reality is more nuanced, scientists say.

21 hours ago · A newly identified flu strain that spreads easily and causes more severe illness is driving infections this season. The strain, a mutated form of influenza A H3N2 known as subclade K, has …

2 days ago · A mutated, potentially severe strain of influenza A called H3N2 "subtype K" is spreading worldwide. Experts discuss what to expect in the U.S., symptoms, and whether vaccine still work.

Dec 16, 2025 · A mutated H3N2 influenza A strain, known as subclade K, is causing significant flu activity in the US, surpassing early seasonal thresholds.

Nov 30, 2025 · The new strain is a variation of influenza A. Technically, it’s called the K subclade of influenza A’s H3N2 subtype, and it makes up a majority of the H3N2 cases we’re seeing right now....