A vaccine candidate developed at the University of Oxford has shown encouraging results in early human testing and appears to be "safe well-tolerated, and immunogenic", according to a study published in The Lancet.

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Trials involving 1,077 people showed the injection led to them making antibodies and white blood cells that can fight coronavirus. "Our preliminary findings show that the candidate ChAdOx1 nCoV-19 vaccine given as a single dose was safe and tolerated, despite a higher reactogenicity profile than the control vaccine, MenACWY," the researchers, led by Pedro M Folegatti and Katiet Ewer, wrote in the study.

"No serious adverse reactions to ChAdOx1 nCoV-19 occurred. The majority of adverse events reported were mild or moderate in severity, and all were self-limiting," the study said. The clinical trials of a potential COVID-19 vaccine on humans began in April. The Oxford vaccine -- called ChAdOx1 nCoV-19 -- is made from a harmless chimpanzee virus. The human vaccine trial has been developed by scientists at Oxford University's Jenner Institute, the university confirmed to CNN.

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