Leading the team is Sarah Gilbert, a professor of vaccinology at Oxford University. A vaccine could be available for use by the general public by the autumn, said Gilbert.
However, she said there is always an unknown and scientists can never be sure that vaccines are going to work.
Prof Gilbert explained previous comments in which she said she was 80 per cent confident of the vaccine’s success.
She said: “Personally, I have a high degree of confidence. This is my view, because I’ve worked with this technology a lot, and I’ve worked on the Mers vaccine trials, and I’ve seen what that can do.
“And, I think, it has a very strong chance of working.”
Asked when the first dose of the vaccine might be delivered to a trial volunteer, Professor Andrew Pollard, chief Investigator on the study said it depended on when the last part of the testing from the manufacturing had concluded.
However, he added: “But it should be within the next week or so, but we’ll confirm that as soon as we can.”
The researchers say that, as well as developing a vaccine that can be used on a mass scale, it is important to make sure it can be manufactured at the required pace.
He added: “We’re now moving to the point where instead of doing maybe a three litre manufacturing run, we’re up to 50 litres will go to 100, 200, maybe even 2000. And we’re talking to manufacturers who can provide that sort of manufacturing service.
“The aim is to have at least a million doses by around about September, once you know the vaccine efficacy results.
“And then move even faster from there because it’s pretty clear the world is going to need hundreds of millions of doses, ideally by the end of this year to end this pandemic, to let us out of lockdown.
“A vaccine is the exit strategy for this pandemic and then we’re very likely to need a vaccine in future years because it’s unlikely we’ll be able to eradicate this virus.”
How do viruses jump from animals to humans?
Every animal species hosts unique viruses that have specifically adapted to infect it. Over time, some of these have jumped to humans – these are known as ‘zoonotic’ viruses.
As our populations grow, we move into wilder areas, which brings us into more frequent contact with animals we don’t normally have contact with. Viruses can jump from animals to humans in the same way that they can pass between humans, through close contact with body fluids like mucus, blood, faeces or urine.
Because every virus has evolved to target a particular species, it’s rare for a virus to be able to jump to another species. When this does happen, it’s by chance, and it usually requires a large amount of contact with the virus.
Amy is the Editorial Assistant at BBC Science Focus and looks after all things books, culture and media. She is also a regular interviewer on the Science Focus Podcast. Her interests range from natural history and wildlife, to women in STEM and accessibility tech.