British scientists have said they hope to have one million doses of a coronavirus vaccine ready to be deployed by September.
The team at Oxford University will start the first UK study of an experimental vaccine against COVID-19 next week.
But so great is the need, and so high their confidence that it will work, that they will start large-scale production before the trials are even complete.
Professor Adrian Hill, director of Oxford University's Jenner Institute, said the world could not afford to wait for vaccines to be proven to be safe and effective in trials that would involve months of delay before production starts.
He told Sky News: "While those trials are going on we have to start manufacturing, manufacturing at risk because if the vaccine fails nobody will want the doses.
"But the hope is to have about a million doses by September ready for deployment.
"It's a big ask, but not impossible."
The Oxford team say there is an 80% chance of success. If trials are positive hundreds of millions of doses could be ready by the end of the year.
The vaccine, called ChAdOx1 nCoV-19, is made from a harmless chimpanzee virus that has been genetically engineered to carry part of the coronavirus. The technique has already been shown to generate strong immune responses in other diseases.
Deals have already been done with three UK manufacturers, and several more abroad, to make the vaccine.
The scientists have been awarded £2.2m to fund clinical trials by the government's new vaccine taskforce, which aims to speed up their development and manufacture.
Source: Sky News