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What Do Vaccine Efficacy Numbers Actually Mean?

If a vaccine has an efficacy of 95%, it doesn’t mean that 5% of people who receive that vaccine will get #COVID19. And because 1 vaccine ends up with a higher efficacy estimate than another in trials doesn’t mean it’s superior.





https://www.nytimes.com/interactive/2021/03/03/science/vaccine-efficacy-coronavirus.html

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