Viral vector vaccine for prevention of COVID-19 From Wikipedia, the free encyclopedia
The Oxford–AstraZeneca COVID‑19 vaccine, sold under the brand names Covishield[31] and Vaxzevria[1][32] among others, is a viral vector vaccine for the prevention of COVID-19. It was developed in the United Kingdom by Oxford University and British-Swedish company AstraZeneca,[33][34][35] using as a vector the modified chimpanzee adenovirus ChAdOx1.[36] The vaccine is given by intramuscular injection. Studies carried out in 2020 showed that the efficacy of the vaccine is 76.0% at preventing symptomatic COVID-19 beginning at 22 days following the first dose and 81.3% after the second dose.[37] A study in Scotland found that, for symptomatic COVID-19 infection after the second dose, the vaccine is 81% effective against the Alpha variant (lineage B.1.1.7) and 61% against the Delta variant (lineage B.1.617.2).[38]
![]() A vial of COVID-19 Vaccine AstraZeneca | |
Vaccine description | |
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Target | SARS-CoV-2 |
Vaccine type |