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A man holds his vaccination certificate as he walks under large posters advertising the COVID-19 vaccination campaign at a vaccination center that offers both AstraZeneca and Pfizer vaccines in Bucharest, Romania, Tuesday, March 23, 2021. AstraZeneca's repeated missteps in reporting vaccine data coupled with a blood clot scare could do lasting damage to the credibility of a shot that is the linchpin in the global strategy to stop the coronavirus pandemic, potentially even undermining vaccine confidence more broadly, experts say. (Photo by Vadim Ghirda/AP Photo)
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