What is the 'super' K flu variant and is it too late for a vaccine?
Dec 28, 2025
Much of the concern this flu season is coming from the spread of subclade K, a subtype of influenza A. Similar subtypes have historically caused more hospitalizations and deaths than other strains. 
https://www.kxan.com/top-stories/what-is-the-super-k-flu-variant-and-is-it-too-late-for-a-vaccine/
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