Watch: Oxford vaccine may reduce transmission by 67% - and protection 'remains for three-month jab interval'
The Oxford/AstraZeneca vaccine may have a "substantial effect" on transmission of the virus, and a three-month gap between doses does not lower protection, according to a report.
Tests results by University of Oxford, published in a pre-print report with The Lancet, showed a 67% reduction in positive swabs among those vaccinated.
In the report, the university also said that a single standard dose of the Oxford/AstraZeneca vaccine is 76% effective from day 22 to day 90 after the jab.
This means protection is not reduced in the three months between the first and second dose.
The report supports the government's strategy that rolling out first doses - with a second dose after three months - is effective at reducing disease.
After the second dose, efficacy is 82.4% - if the interval between jabs is three months.
Watch: Coronavirus antibodies last for at least six months after infection, study finds