This undated file photo issued by the University of Oxford shows of a vial of coronavirus vaccine developed by AstraZeneca and Oxford University, in Oxford, England. Britain has authorized the use of a second COVID-19 vaccine, becoming the first country to greenlight an easy-to-handle shot that its developers hope will become the “vaccine for the world.” The United Kingdom government says the Medicines and Healthcare Products Regulatory Agency has made an emergency authorization for the vaccine developed by Oxford University and U.K.-based drugmaker AstraZeneca. (John Cairns/University of Oxford via AP, File)
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