California will require health care workers to get a booster shot of the coronavirus vaccine, Gov. Gavin Newsom announced Tuesday.
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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.
Most Americans should be given the Pfizer or Moderna vaccines instead of the Johnson & Johnson shot that can cause rare but serious blood clots, U.S. health advisers recommended Thursday.
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.