The CDC's Nowcast data tracker, which displays COVID-19 estimates and projections for two-week periods, reflected that the KP.3.1.1 variant accounted for 57.2% of positive infections, followed by XEC at 10.7% in the two weeks starting on Sept. 29 and ending on Oct. 12.

The XEC variant has reportedly been identified in 15 countries across the world, with experts warning the strain could be the 'next' to spread. While the UK Health Security Agency has yet to provide detailed data on the strain,