Oxford–AstraZeneca COVID-19 vaccine

Vaccine against COVID-19

The Oxford–AstraZeneca COVID-19 vaccine, codenamed AZD1222, and sold under the brand name Covishield and Vaxzevria among others, is a viral vector vaccine for COVID-19 developed by Oxford University and AstraZeneca given by intramuscular injection, using as a vector the modified chimpanzee adenovirus ChAdOx1. An analysis published on 19 February 2021 showed an efficacy of 76.0% at preventing symptomatic COVID-19 beginning at 22 days following the first dose, increasing to 81.3% when the second dose is given 12 weeks or more after the first.

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