Could old coronavirus variants ever come back?

(NEXSTAR) – When the omicron variant emerged, it immediately made its presence known, spreading like wildfire and driving the United States' largest coronavirus case spike yet. In 2023, the record-breaking spike is over, but omicron isn't.
According to tracking by the Centers for Disease Control and Prevention, omicron and its subvariants make up 99.9% of current COVID-19 spread. The delta variant, which overloaded hospitals and killed thousands in late summer 2021, is now responsible for