An app to alert people if they have been close to someone who has tested positive for coronavirus has been suggested by scientists.
The technology could significantly slow the rate of transmission and help countries to emerge from lockdowns safely, scientists claim.
A study by the University of Oxford's Big Data Institute and Nuffield Department of Population Health published in the journal Science proposes an app that uses Bluetooth to keep a log of all other app users a person has been in close proximity with over a few days.
When an individual tests positive for Covid-19, the app can then be used to notify anyone who has been near them anonymously and advise them to go home and self-isolate as a precaution against further spread.