Researchers at the U.K. Health Security Agency estimated that one dose of the vaccine was 78% effective at protecting against infection 14 or more days after vaccination.
On Thursday, the largest county in the United States said it is "strongly recommending" people wear face coverings in indoor public settings but stopped short of requiring them.
New research predicts that higher rates of those five and older getting the bivalent booster shot could prevent millions of missed school days and thousands of hospitalizations for kids and teens. ...
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