One dose of a Covid vaccine can almost halve transmission, study finds – CNBC

A nurse Cindy Mendez using a protective mask holds a syringe with a dose of the Pfizer-BioNTech COVID-19 vaccine throughout the coronavirus disease (COVID-19) pandemic, at NYC Health + Hospitals Harlem Hospital in the Manhattan borough of New York City, New York, February 25, 2021. Jeenah Moon

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