THE NHS app has failed to warn thousands of people to self-isolate after coming into contact with Covid-19 sufferers.
The Test and Trace software for England and Wales was set at the wrong sensitivity levels and not fixed for a month, The Sunday Times revealed.
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The Department of Health said the £12billion app was deemed “excellent by international standards”.
The app is used by people in England and Wales – Scotland and Northen Ireland have their own systems.
The problems were triggered with the Test and Trace app, developed under Baroness Dido Harding, because the software was set at the wrong sensitivity levels.
People who had a “risk score” that should have led them to be contacted did not hear anything.
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For a month, the Department of Health and Social Care failed to use a software fix developed to make the app work properly and a government source told the paper “shockingly low” numbers of users had been sent warnings since the app was released on September 24.
Critics fear it may explain why Sage government scientific advisers recently warned that the £12bn test and trace system, of which the app is a key part, has only had a “marginal” impact on slowing the spread of the virus.
But a spokesman for the Department of Health and Social Care said: “The NHS Covid-19 app is the only app in the world using the latest Google/Apple technology to better gauge distance to identify those most at risk, and is deemed ‘excellent’ by international standards.”
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