A tuberculosis vaccine usually given to children is set to be tested on frontline workers in a bid to help protect against Coronavirus.
The widely used Bacillus Calmette-Guerin (BCG) vaccine will be trialled globally to 10,000 people after the injection was found to stimulate the immune system.
The University of Exeter is leading the UK arm of the trial and will soon recruit healthcare staff and care home workers in the UK.
Participants will be given either the BCG vaccine, which is currently given to more than 100 million babies worldwide each year to protect against tuberculosis, or a placebo injection.