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Why you can't compare Covid-19 vaccines | Vox

Why you can't compare Covid-19 vaccines | Vox

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 third vaccine introduced in the US, from Johnson & Johnson, has a considerably lower efficacy rate: just 66%.
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