The latest Covid-19 case surge is expanding beyond the Northeast, with places from the Midwest to Florida and California under rising pressure.
Fueled by highly contagious versions of the Omicron variant, the tide is posing a test of how much new infections matter in a changing pandemic. Though built-up immunity in the population has kept more people out of hospitals, federal health officials on Wednesday urged people in hot spots to take precautions, from booster shots to pre-gathering tests and masks, to limit the virus’ spread.
