Virus fears widen as omicron variant takes hold across US

City residents wait in a line extending around the block to receive free at-home rapid COVID-19 test kits Monday in Philadelphia. (AP Photo/Matt Rourke)

BOSTON — The nation’s second-largest city called off its New Year’s Eve celebration Monday, and its smallest state re-imposed an indoor mask mandate as the omicron variant leaped ahead of other variants to become the dominant version of the coronavirus in the U.S.