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The app can be downloaded free onto a mobile phone

Scotland’s new contact tracing app to help combat the spread of coronavirus has gone live.

The Scottish government has said the software will support the Test and Protect system and is “another tool in the fight against Covid-19”.

The Protect Scotland app lets people know if they have been in close contact with someone who later tests positive.

It can be downloaded for free onto a smart phone from Apple’s App Store or Google Play.

First Minister Nicola Sturgeon has urged as many people as possible to get involved in the new tracing scheme.

She tweeted on Thursday morning: “There’s a new way to help fight Covid in Scotland. ‘Protect Scotland’ – our confidential contact tracing app – will anonymously notify app users you’ve been in close contact with, should you test positive.

“Please download, and let’s all protect Scotland.”

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Up until now, contact tracing has been done manually using a method followed for years to help control the spread of infectious diseases.

Scotland has followed Northern Ireland in choosing to use the toolkit provided by Apple and Google to build a contact tracing app which has privacy built in. Both have moved quickly by using the software developed for Ireland’s app.

Scotland did at first seem inclined to work with the NHSX England app team, which for months pursued a centralised app collecting more data, without the cooperation of the tech giants.

But seeing some knotty technical issues with the English app they then decided to follow many other countries going down the Apple Google route.

One person close to the Scottish project said “using something that the tech giants had created was easier than trying to create stuff ourselves”.

England also eventually changed tack and has been testing an app based on the Apple Google toolkit for the last month on the Isle of Wight and the London borough of Newham.

But there’s still no word on a national rollout – and it seems England, which once saw a contact tracing app as a vital weapon in the battle against the virus, is now happy to be a follower rather than a leader in this technology.

With 64,000 downloads by 09:00 on launch day, the Test and Protect team feel their app has got away to a good start – but the real question is whether it will help speed up warnings to people who may have been close to someone infected with the virus.

It will be weeks before we know whether the app is an effective tool.

The new app uses Bluetooth technology to alert users if they have been in prolonged close contact with someone who subsequently tests positive for Covid-19.

When an individual initially tests positive for the virus, they are contacted by phone in the usual way.

The contact tracer will ask them if they are an app user and if they are willing to use the app’s upload function to anonymously alert close contacts.

If they agree, they will be sent a unique code to their mobile which unlocks this function on the app.

By sharing their positive test result in this way, the information will form part of an anonymous database.

The app on other users’ phones regularly checks this database to see if they have been in contact with an infected person.

A warning is automatically issued when a match is found and users are then urged to get tested or self-isolate for 14 days.

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