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COVID-19 vaccine fast facts.

2021 
What are the benefits and risks of 3 coronavirus disease 2019 (COVID-19) vaccines? Interim results (2 large RCTs) show the relative efficacy of the Pfizer-BioNTech and Moderna vaccines (about 95%) and the AstraZeneca-Oxford vaccine (about 70%) in preventing COVID-19. Absolute benefits will vary
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