The Centers for Disease Control and Prevention added to research suggesting the Omicron variant can lead to reinfections that are often accompanied by mild Covid-19 symptoms, as new cases soared across the U.S.
States reported 512,553 cases on Monday—the most for a single day since the start of the pandemic—as states caught up after pausing for the Christmas holiday, according to a Wall Street Journal analysis of data from Johns Hopkins University. The tally lifted the seven-day average of reported cases to 237,061, 15,000 less than the pandemic high recorded about a year ago.