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FILE - A medical worker prepares a shot of Russia's Sputnik Lite coronavirus vaccine at a vaccination center in the GUM, State Department store, in Red Square with the St. Basil Cathedral in the background, in Moscow, Russia, Oct. 26, 2021. The developer of Russia's Sputnik V vaccine said Monday Nov. 29, 2021, that it will immediately start working on adapting that COVID-19 vaccine to counter the omicron variant. (AP Photo/Pavel Golovkin, File)