Scary 22% vaccine efficacy in South Africa comes with heaps of caveats

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Enlarge / Vials in entrance of the AstraZeneca British biopharmaceutical firm brand are seen on this artistic photograph taken on 18 November 2020. Getty| NurPhoto Covid-19 Protection Scary 22% vaccine efficacy in South Africa comes with heaps of caveats Tweaking COVID vaccines to struggle variants received’t require large trials, FDA says FDA now reviewing a …
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