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COVID-19 Scan for Feb 18, 2021

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Analysis suggests high efficacy for single dose of Pfizer-BioNTech vaccineAn analysis by Canadian researchers suggests that a single dose of the Pfizer-BioNTech COVID-19 vaccine is highly efficacious, according to a letter published yesterday in the New England Journal of Medicine (NEJM).Results from the phase 3 trial of the Pfizer-BioNTech vaccine, published in NEJM on Dec 31, 2020, suggested the efficacy after the first dose of the two-dose vaccine was 52.4%, based on data collected during the first 2 weeks after the first shot to before the second shot.

The overall efficacy after two doses was 94.8%.But in their analysis of trial data submitted to the US Food and Drug Administration by Pfizer and BioNTech, researchers with the British

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