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The app uses an Apple and Google-developed system, using Bluetooth to keep an anonymous log of people a user has been close to. It does this by exchanging randomised keys while the Bluetooth signal strength measures proximity. If someone falls ill, they can tell the app, and close contacts will be automatically sent a notification and given guidance.

A QR code scanning feature allows people to check-in to venues they visit and share their contact details for human tracing efforts.

Professor Christophe Fraser, scientific adviser to the Test and Trace program, said: “Our Oxford University research team analysis has shown the potential to meaningfully reduce the number of coronavirus cases, hospitalisations and deaths across the population from as little as 15 per cent of the whole population downloading the app and following the guidance to self-isolate.

“This means each one of us can make a difference to help stop the spread of infection, save lives and help protect our loved ones.”

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