A front-runner in the global race, the University of Oxford's much-anticipated Covid-19 vaccine trial only has a 50% chance of success. Professor Adrian Hill, co-leading the project, told British newspaper Telegraph that an upcoming trial with 10,000 volunteers threatened to give "no results" as the disease is disappearing rapidly in the UK. "It's a race against the virus disappearing, and against time", he said. The lower the transmission rate, the longer it will take to generate data. Doubts have been cast about the jab earlier after the animal trial on monkeys suggested that it didn't stop them from getting infected. The vaccine is currently in trials on humans to prove it is safe.