The nation’s top public health agency on Thursday relaxed its COVID-19 guidelines, dropping the recommendation that Americans quarantine themselves if they come into close contact with an infected person.
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Confirmed COVID-19 cases have risen more than 50 percent in 10 days, the threshold at which the city’s guidelines call for people to wear masks indoors.
An early look at the performance of COVID-19 booster shots during the recent omicron wave in the U.S. hinted at a decline in effectiveness, though the shots still offered strong protection against severe illness.