A coronavirus vaccine developed by AstraZeneca PLC and the University of Oxford was found to be up 90 percent effective without serious side effect, the team reported on Monday.
The two partners said the results were part a large late-stage clinical trial in the U.K. and Brazil.
They said efficacy ranged from 62 percent to 90 percent depending on dosage given.
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“These findings show that we have an effective vaccine that will save many lives,” said key researchers Dr. Andrew Pollard.
Pollard added that scientists found that if people were given a half dose followed by a full doses, rather than two full doses, efficacy rose to 90 percent.
Last week, Moderna and Pfizer said their own vaccines were nearly 95 percent effective.