While Covid-19 may have started to become an afterthought to many Americans, it may feel like a new variant snuck up and is now driving infection and hospitalization rates higher.

The new subvariant of Omicron, BA.5, shows how the virus continues to evolve around the best efforts of humanity to defeat it.

The surge in cases is global, thanks to both BA.5 and another subvariant, BA.4.Public health officials are urging adults 50 and older to get second booster shot.

But many still aren't paying attention; only about a quarter of these eligible adults have received a second booster.

"US health officials are urgently working on a plan to allow second Covid-19 boosters for all adults" amid fears that younger adults' immunity may be waning as cases rise with the dominance of BA.5.