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  1. Oxford–AstraZeneca COVID-19 vaccine - Wikipedia

  2. The Oxford/AstraZeneca (ChAdOx1-S [recombinant] vaccine ...

  3. Different types of COVID-19 vaccines: How they work

  4. Statement of the WHO Global Advisory Committee on Vaccine ...

  5. Comparing the differences between COVID-19 vaccines

  6. Clinical Guidance for COVID-19 Vaccination | CDC

  7. Coronavirus disease (COVID-19): Vaccines and vaccine safety

  8. AstraZeneca COVID-19 vaccine authorised for emergency use by ...

  9. How the Oxford-AstraZeneca Vaccine Works - The New York Times