Children and older adults are to be included in the second phase of vaccine trials to protect against coronavirus.
The first phase of the University of Oxford trial began in April, with 1,000 people given the jab.
Now, more than 10,200 adults, including over 70s and five- to 12-year-olds – will be enrolled in the study, to see the effects on their immune system.
Trials of the same vaccine on monkeys appear to have given them protection against the disease.
The scientists behind it have previously said they are aiming to have at least a million doses of a coronavirus vaccine by September this year.
But the UK government has repeatedly said there are no guarantees – and a vaccine could still be some way off.
And most experts still estimate