But Professor Adrian Hill, director of the university’s Jenner Institute, said his team is now facing a major problem, questioning the September deadline.
Professor Hill, who is in charge of developing the vaccine at the University of Oxford, said he needed 10,000 infected people to prove the effectiveness of the treatment.
However, the coronavirus is disappearing so quickly in the UK that the next phase of the trials has only a 50% chance of success.
Without the virus spreading in the community, volunteers will not get the disease, leaving scientists unable to prove that their vaccine makes a difference.
Meanwhile, Boris Johnson is scheduled to hold a cabinet meeting of his senior ministers on Monday to discuss ways in which the UK can further ease the lock-in restrictions.
This will likely include an update on the reopening of schools and possibly non-essential retail businesses.
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Brazil recorded 965 new deaths from coronavirus on Saturday, bringing the total number to 22,013, the ministry of health said.
The country now has 347,398 confirmed cases, the ministry said, up 16,508 from Friday when it overtook Russia to become the global virus hot spot behind the United States.
7:45 am update: The Wuhan Pathogen Laboratory which is at the center of speculation about a coronavirus laboratory leak had coronavirus strains, but not Covid-19, according to Chinese scientists.
The virology laboratory in Wuhan, the city at the heart of the epidemic, was working on three living strains of bat coronavirus, but none of them match the one that caused the Covid-19 pandemic, said its director.
Wang Yanyi told Chinese public broadcaster CGTN, “Our institute received the clinical sample of the unknown pneumonia for the first time on December 30 of last year. We had no knowledge before that, and we had never encountered, researched or stored the virus. In fact, like everyone, we didn’t even know the virus existed. How could he have escaped from our laboratory when we never had it? “
7:10 a.m. update: Ministers rally around Dominic Cummings, Prime Minister’s first assistant, accused of breaking lock rules by traveling 260 miles to be close to relatives
7:00 update: British Secretary of Transport Grant Shapps defended Cummings and said he had “full support” from PM
6:45 am update: China, where the virus broke out last year, has not registered any new cases for the first time