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What a vaccine’s “efficacy rate” actually means. Sign up for our newsletter: http://www.vox.com/video-newsletter In the US, the first two available Covid-19 vaccines were the ones from Pfizer/BioNTech and Moderna. Both vaccines have very high “efficacy rates,” of around 95%. But…

The first COVID-19 vaccines represent an incredible record-breaking achievement in vaccine development. Not only were the Moderna and Pfizer/BioNTech vaccines created in record time, they also harness a never-before-used technology: immunization through mRNA. But how do these vaccines protect us…