Every adult in all U.S. states as of Monday was eligible to receive a COVID-19 vaccine. The final states to open up eligibility to their entire adult population were Hawaii, Massachusetts, New Jersey, Oregon, Rhode Island, and Vermont. "It's truly historic that we have already reached this milestone," the University of Washington Medical Center's Dr. Nandita Mani said. President Biden announced in March he was directing states to make all adults eligible for COVID-19 vaccination by May 1. But as states increasingly moved to open up vaccinations to all adults sooner, Biden moved the deadline up to April 19. According to the CDC, half of American adults have received at least one COVID-19 vaccine dose, and 32.5 percent of adults are fully vaccinated.

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