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EXPLAINER: How Russia's 'Sputnik V' coronavirus vaccine works

Russia's coronavirus vaccine uses modified adenoviruses, viruses that cause the common cold, to trigger an immune response and prime the immune system to respond to SARS-CoV-2. Source: SOURCES: Radio Free Europe, TASS Russian News Agency, The Lancet, Reuters, Gamaleya National Center, BBC News, Next Animation via REUTERS