The Oxford University Covid-19 vaccine – of which the UK has 100 million doses – can prevent 70.4% of people from getting the virus, new data shows.
AstraZeneca and Oxford University announced their jab is effective in preventing the majority of people from getting ill.
The UK has placed orders for 100 million doses of the vaccine – enough to vaccinate most of the population.
Researchers said the vaccine has been shown to work in different age groups, including the elderly.
The announcement has been hailed as “another step closer to the time when we can use vaccines to bring an end to the devastation” of the pandemic,
Sarah Gilbert, professor of vaccinology at the University of Oxford, said: “We will continue to work to provide the detailed information to regulators. It has been a privilege to be part of this multi-national effort which will reap benefits for the whole world.”
The UK also has orders for 40 million doses of a jab from Pfizer and BioNTech, which has been shown to be 95% effective.
Another jab from Moderna is 95% effective, according to trial data.