A nasty ‘superflu’ virus is spreading in the U.S. right now: What to know about the subclade K flu variant

The variant is part of the H3N2 strain, but it’s distinct enough to make it materially different. It comes as peak influenza season is getting underway. For many people, the winter holiday period is their favorite time of the year. It’s weeks full of family, friends, gifts, and cozy indoor get-togethers.