In this Tuesday, July 27, 2021, file photo, a medical worker prepares a shot of the Moderna vaccine during a vaccination campaign at Saint Damien Hospital in Port-au-Prince, Haiti. The White House says the U.S. has donated its 200 millionth COVID-19 shot to help vaccinate the rest of the world. The Biden administration is aiming to lead a global vaccination campaign even as it rolls out boosters for domestic use. (AP Photo/Joseph Odelyn, file)
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