Coinspeaker AstraZeneca and Oxford University COVID-19 Vaccine Trial: 50% Chance of Success PredictedWhile the COVID-19 vaccine candidate of Oxford University and AstraZeneca has proved to be effective in the pre-clinical study, scientists warn it has a 50% chance of success and may return "no result". AstraZeneca and Oxford University COVID-19 Vaccine Trial: 50% Chance of Success Predicted