The Oxford vaccine is up to 90% effective in preventing COVID-19, according to tests on thousands of volunteers.
The result compares with the Pfizer and Moderna vaccines, which were recently shown to be 95% and 94.5% effective respectively.
The vaccine, codenamed AZD1222, was developed at Oxford University with support from the pharmaceutical giant AstraZeneca.
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For one course of dosing - where people were given a half dose of AZD1222, followed by a full measure at least a month after - there was an efficacy rate of 90%.
When two full doses were given at least a month apart, the Oxford inoculation had an efficacy of 62%.
Professor Andrew Pollard, chief investigator of the Oxford Vaccine Trial at Oxford, said:
"Excitingly, we've found that one of our dosing regimens may be around 90% effective and if this dosing regime is used, more people could be vaccinated with planned vaccine supply."
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