In this undated file photo issued by the University of Oxford, a volunteer is administered the coronavirus vaccine developed by AstraZeneca and Oxford University, in Oxford, England. With major COVID-19 vaccines showing high levels of protection, British officials are cautiously — and they stress cautiously — optimistic that life may start returning to normal by early April. Even before regulators have approved a single vaccine, the U.K. and countries across Europe are moving quickly to organize the distribution and delivery systems needed to inoculate millions of citizens. (University of Oxford/John Cairns via AP, File)
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