Half of the states are seeing COVID case numbers rise again while nationwide totals continue to fall.
The big picture: The Omicron subvariant known as BA.2 is the dominant strain circulating around the U.S., accounting for almost three out of every four cases.
Rates of confirmed Omicron-related COVID infection and severe disease were lower after a fourth dose of the Pfizer-BioNTech vaccine, according to real-world data from Israel, although protection against confirmed infection seemed short-lived.
Across the United States, officials have dropped mask mandates and are closing mass vaccine and testing sites as new coronavirus cases have fallen nationally to about 27,000 a day on average. But several states — mostly in the Northeast — have had some increases in case numbers over the past two weeks, according to a New York Times database
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