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"In the face of federal leadership that has completely failed us, the West Coast is taking action," said Gov. Gavin Newsom.
As some health experts advise greater caution amid the uptick, California has partnered with other states to establish vaccine recommendations.
Gov. Kathy Hochul signed an executive order Friday morning allowing New Yorkers to get a COVID-19 vaccine at pharmacies in the state without a prescription.
"100% of adults in this country can still get the vaccine if they choose," FDA Commissioner Dr. Marty Makary said
U.S. regulators approved updated COVID-19 shots Wednesday but limited their use for many Americans - and removed one of the two vaccines available for young children.