Oxford-AstraZeneca’s Covid-19 Vaccine Up to 90% Effective
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Preliminary results from the trials of the Covid-19 vaccine jointly developed by the University of Oxford and AstraZeneca indicate that the vaccine’s overall efficacy is 70% but that a regimen that calls for a lower first dose is 90% effective.

The preliminary results on the AstraZeneca vaccine were based on a total of 131 Covid-19 cases in a study involving 11,363 participants. The findings were perplexing. Two full doses of the vaccine appeared to be only 62% effective at preventing disease,...

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