The University of Oxford’s Jenner Institute and the Oxford Vaccine Group began developing a COVID-19 vaccine, officially known as ChAdOx1 nCoV-19, that was taken from chimpanzees in January, according to Sky News.
However, there is only a 50 percent chance of the Oxford coronavirus vaccine working because cases in the UK are declining so fast, there may not be enough people to test it on, said the institute’s director Professor Adrian Hill.
The total number of lab-confirmed cases in the UK is 259,559 so far, and the daily number of lab-confirmed cases was 2,409 on Sunday, according to GOV.UK website.
With Brazil surpassing the UK on May 19 in terms of confirmed cases, it’s not hard to see that the COVID-19 cases have fallen in the UK since the peak of the outbreak, which means that there would be fewer patients for vaccine testing. And scientists will not have enough evidence to prove the vaccine is effective, according to the Sky News report.