A medical worker administers a shot of Russia's Sputnik V coronavirus vaccine at a vaccination center in Gostinny Dvor, a huge exhibition place in Moscow, Russia.

COVID-19

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Judy Twigg, a global public health expert at Virginia Commonwealth University, joins The World's host Marco Werman to discuss the science behind Russia's new vaccine cocktail.

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A medical worker administers a shot of Russia's Sputnik V coronavirus vaccine at a vaccination center in Gostinny Dvor, a huge exhibition place in Moscow, July 12, 2021. Russia’s health officials have given a go-ahead to testing a combination of the AstraZeneca coronavirus shot and the single-dose version of the domestically developed Sputnik V vaccine.

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Pavel Golovkin/AP

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