Home / Health / US Faces Dual Threat: Super Flu & New Covid Strain
US Faces Dual Threat: Super Flu & New Covid Strain
18 Dec, 2025
Summary
- Flu hospitalizations surged nearly 50% week-over-week.
- New H3N2 subclade K 'super flu' is highly contagious.
- Dominant Covid variant XFG causes 'razor blade' throat pain.

As winter intensifies, the United States is contending with a significant rise in both influenza and a new variant of Covid-19. Recent data indicates a nearly 50 percent increase in flu-related hospitalizations compared to the previous week, with 'very high' transmission noted in several states including New York and Colorado. This surge is largely attributed to a new H3N2 subclade K, a strain unfamiliar to many immune systems, increasing vulnerability to severe illness.
In parallel, the Covid strain XFG, or Stratus, has become dominant, reportedly causing a unique 'razor blade' sensation in the throat. While flu symptoms are typical, this novel strain's novelty poses a heightened risk. Both illnesses are predicted to worsen in the upcoming weeks, prompting some schools to close and hospitals to reintroduce masking measures for patients and staff.



