But experts warned that there was still a long way to go until a vaccine could enter the market.
Brendan Wen, Professor of Microbial Pathogenesis at London’s School of Hygiene and Tropical Medicine, told Reuters news agency: “The report is a case of ‘so far, so good'”.
According to the World Health Organization, there are 176 potential vaccines currently being developed worldwide. Of those, 34 are currently being tested on people. Among those, eight are at stage three, the most advanced.