FILE - In this Dec. 15, 2020, file photo, a droplet falls from a syringe after a health care worker was injected with the Pfizer COVID-19 vaccine at a hospital in Providence, R.I. An untold number of Americans have managed to get COVID-19 booster shots even though the U.S. government hasn't approved them. They're doing so by taking advantage of the nation’s vaccine surplus and loose tracking of those who have been fully vaccinated. (AP Photo/David Goldman, File)
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