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In this Wednesday, Aug. 5, 2020, file photo, senior Clinical Research Nurse Ajithkumar Sukumaran prepares the COVID 19 vaccine to administer to a volunteer, at a clinic in London. (AP Photo/Kirsty Wigglesworth, File)

In this Wednesday, Aug. 5, 2020, file photo, senior Clinical Research Nurse Ajithkumar Sukumaran prepares the COVID 19 vaccine to administer to a volunteer, at a clinic in London. (AP Photo/Kirsty Wigglesworth, File)

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