FLiRT: New COVID-19 subvariants on the rise across the US. Here’s what to know

U.S. health officials are keeping an eye on the so-called “FLiRT” COVID-19 subvariants as the U.K. sees a rise in COVID hospitalizations.

“Our vigilance should increase as we see cases rise, primarily driven by increased travel and social gatherings typical of the summer months,” said Dr. John…