The coronavirus vaccine developed by the University of Oxford stops up to 90% of people from developing symptoms, a trial has suggested.
Researchers, who carried out a large-scale trial of 20,000 people, say overall the vaccine is 70% effective.
But they added this rose to 90% in a group of volunteers who were given an initial half dose, followed by a full dose.
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source https://metro.co.uk/2020/11/23/oxford-covid-vaccine-up-to-90-effective-13637779/
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