U.S. health officials on Monday cut isolation restrictions for Americans who catch the coronavirus from 10 to five days, and shortened the time that close contacts need to quarantine.
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President Joe Biden announced Tuesday that the government would provide 500 million free rapid tests, increase support for hospitals and redouble vaccination and boosting efforts.
Blood samples taken a month after a booster showed people had levels of omicron-neutralizing antibodies that were similar to amounts proven protective against earlier variants after two doses.