Boxes containing the Moderna COVID-19 vaccine are moved to the loading dock for shipping at the McKesson distribution center in Olive Branch, Miss., Sunday, Dec. 20, 2020. (AP Photo/Paul Sancya, Pool)
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Boxes containing the Moderna COVID-19 vaccine are moved to the loading dock for shipping at the McKesson distribution center in Olive Branch, Miss., Sunday, Dec. 20, 2020. (AP Photo/Paul Sancya, Pool)
