Contact tracing

Apple and Google team up to contact trace Covid-19

They hope to initially help third-party contact-tracing apps run efficiently.

But ultimately, they aim to do away with the need to download dedicated apps, to encourage the practice.

The two companies believe their approach - designed to keep users, whose participation would be voluntary, anonymous - addresses privacy concerns.

Their contact-tracing method would work by using a smartphone's Bluetooth signals to determine to whom the owner had recently been in proximity for long enough to have established contagion a risk.