FILE - In this Jan. 28, 2021, file photo, airport employees unload the first shipment of Russia's Sputnik V COVID-19 vaccine after it arrived at the international airport in El Alto, Bolivia. Russia’s boast in August that it was the first country to authorize a coronavirus vaccine led to skepticism because of its insufficient testing on only a few dozen people. Now, with demand growing for the Sputnik V, experts are raising questions again, this time over whether Moscow can keep up with all the orders from countries that want it. (AP Photo/Juan Karita, File)
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