CNBC's senior health and science reporter Meg Tirell on what Pfizer is doing to combat Covid variants. She also reports Russia's Sputnik V Vaccine appears to be 90 percent effective against symptomatic Covid-19.
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February 03, 2021 at 07:11AM
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watch now video02:02 Pfizer and Moderna test Covid-19 booster shots - CNBC
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