Oxford University and AstraZeneca have become the first COVID-19 vaccine makers to publish final-stage clinical trial results in a scientific journal. It has efficacy of how much per cent for those given 2 full doses?

Oxford University and AstraZeneca have become the first COVID-19 vacci

1.	Oxford University and AstraZeneca have become the first COVID-19 vaccine makers to publish final-stage clinical trial results in a scientific journal. It has efficacy of how much per cent for those given 2 full doses?
A.	42
B.	50
C.	62
D.	74
E.	88
Answer» D. 74