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Luis Alves Nogueira, 74, left, receives a dose of the Oxford-AstraZeneca COVID-19 vaccine from a healthcare worker, in the Pupuri community along the Purus River, in the Labrea municipality, Amazonas state, Brazil, Friday, Feb. 12, 2021. Getting the vaccine to the world's farthest corners means delivering it by boat to Maine's islands, traveling by snowmobile to villages in Alaska and navigating complex waterways in Brazil's Amazon. (AP Photo/Edmar Barros)

Luis Alves Nogueira, 74, left, receives a dose of the Oxford-AstraZeneca COVID-19 vaccine from a healthcare worker, in the Pupuri community along the Purus River, in the Labrea municipality, Amazonas state, Brazil, Friday, Feb. 12, 2021. Getting the vaccine to the world's farthest corners means delivering it by boat to Maine's islands, traveling by snowmobile to villages in Alaska and navigating complex waterways in Brazil's Amazon. (AP Photo/Edmar Barros)

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