In this April 21, 2021, file photo, a registered dons protective gear before entering a room at a hospital in Royal Oak, Mich. In 2021, U.S. hospitalizations and deaths are nearly all among the unvaccinated, and real-world data from Britain and Israel support that protection against the worst cases remains strong. What scientists call breakthrough infections in people who are fully vaccinated make up a small fraction of cases. (AP Photo/Carlos Osorio) ** FILE **
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