What to know about the new ‘subclade K’ flu variant

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November 14, 2025 What to know about the new 'subclade K' flu variant By Veronique Greenwood Staff Writer, Health & Science The flu arrived in the U.K. early this year—almost five weeks early. Case numbers are far higher now than they were this time last year, and the dominant variant is a new form of influenza A, which accumulated a startling number of mutations over the summer. READ MORE » If you have a minute, please take our quick survey to help us better understand who you are and which health topics interest you most. Take the Survey WHAT ELSE TO READ The Rise, Fall, and Potential Return of the Food Pyramid The Trump Administration may soon bring back a dietary visual guide from the past.   What It's Like to Be Deathly Afraid of Feet One glimpse downward might trigger a pounding heart, shortness of breath, and feeling like you're going to die.   Why You Get Your Best Ideas in the Shower The sights, sounds, and sensations of running water are perfect for freeing up the mind.   If you were forwarded this and want to sign up to receive it daily, click here. Today's newsletter was written by Veronique Greenwood and edited by Angela Haupt.   Want more from TIME? Sign up for our other newsletters.         Subscribe to TIME TIME may receive compensation for some links to products and services in this email. Offers may be subject to change without notice. Connect with TIME via Facebook | Twitter | Newsletters PRIVACY POLICY | YOUR CALIFORNIA PRIVACY RIGHTS Questions? Contact newsletters@time.com Update your email preferences or unsubscribe here © 2025 TIME USA, LLC. All rights reserved. TIME Customer Service, P.O. Box 37508 Boone, IA 50037-0508, United States of America Terms of Service