According to the CDC, current Covid-19 vaccine efficacy has waned with new Covid variants, although people fully vaccinated and boosted are still much better protected than those without. Fewer than half of Americans have received a booster shot. New vaccines are under development.
https://www.msn.com/en-US/finance/other/omicrons-mutations-impaired-vaccine-effectiveness-cdc-says/ar-AA115Zc0