FORT LAUDERDALE, Fla. (AP) — The U.S. is now averaging 100,000 new COVID-19 infections a day, returning to a milestone last seen during the winter surge in another bleak reminder of how quickly the delta variant has spread through the country.

Health officials fear that cases, hospitalizations and deaths will continue to soar if more Americans don't embrace the COVID-19 vaccine. Nationwide, 50% of residents are fully vaccinated and more than 70% of adults have received at least one dose.

"Our models show that if we don't (vaccinate people), we could be up to several hundred thousand cases a da...