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In this handout photo released by the University of Oxford, a doctor takes blood samples for use in a coronavirus vaccine trial in Oxford, England on Thursday, June 25, 2020. (John Cairns, University of Oxford via AP) ** FILE **

In this handout photo released by the University of Oxford, a doctor takes blood samples for use in a coronavirus vaccine trial in Oxford, England on Thursday, June 25, 2020. (John Cairns, University of Oxford via AP) ** FILE **

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