In this Wednesday, June 24, 2020, file photo, a volunteer receives an injection at the Chris Hani Baragwanath hospital in Soweto, Johannesburg, as part of Africa's first participation in a COVID-19 vaccine trial developed at the University of Oxford in Britain in conjunction with the pharmaceutical company AstraZeneca. On Friday, Oct. 23, 2020, AstraZeneca Inc. announced that the Food and Drug Administration is letting it resume testing of its COVID-19 vaccine candidate in the U.S. (Siphiwe Sibeko/Pool via AP)
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