Results from late-stage testing show the Oxford- AstraZeneca COVID-19 vaccine can be 79% effective at preventing symptoms of COVID-19.

BRIDPORT, ENGLAND – MARCH 20: Oxford AstraZeneca COVID-19 Vaccine and syringe are seen at the medical centre on March 20, 2021 in Bridport, England. Bridport Medical Centre aims to administer a record 2,500 vaccinations in one day with vaccinators coming from medical centres including Lyme, Charmouth and Beaminster. (Photo by Finnbarr Webster/Getty Images)