Contact tracking app proves to save lives

Study published today Nature Shows that the NHS COVID-19 app for digital contact tracing based on the DP3T protocol has avoided 300,000 to 600,000 COVID-19 cases in England and Wales. Researchers have used data from the NHS to show and quantify the epidemiological impact of such privacy-protecting apps, which have become available worldwide to help control pandemics.

Calculating the effectiveness of a privacy-protecting contact tracking app is inherently difficult given its decentralization. British scientists finally tackled this challenge. By combining a data-driven approach with a modeling approach, they have 300,000 to 600,000 COVID-19 cases in the UK alone (September 24th to the end) in three months (September 24th to the end), thanks to the NHS COVID-19 app. Was prevented. (December 2020).

Those results are today Nature It reflects previous work on contact tracking apps in Switzerland (SwissCovid) and Spain (Radar COVID). “This shows that strong privacy is not in conflict with epidemiological effectiveness,” said DP3T, a professor of privacy and security at EPFL, who helped EPFL and ETH Zurich develop in the early stages of the pandemic. Carmela Troncoso, the lead author of the protocol, said. It is also used in the NHS app. The DP3T protocol is the basis of a “contact notification” system integrated into Google and Apple’s mobile operating systems and is now available to billions of people around the world.

One case is avoided for each code entered

Over the last three months, the NHS app has been used by 16.5 million users, with approximately 1.7 million contact notifications after 560,000 positively tested users choose to notify close contacts. Was sent. The researchers estimated that 6% of the people notified were symptomatic and then tested positive. This is a “secondary incidence” (SAR) that is consistent with what was observed with manual contact tracing. This shows that digital contact tracing is as effective as manual contact tracing, but it is significantly faster and has a much lower risk of overwhelming medical services.

The digital contact tracing app made a big difference because the estimation rate of one case for each COVID code entered was avoided. Researchers also estimated that with increasing app usage, cases could be reduced by 0.8-2.3%. “This is these apps General population“Marcel Salathé, professor of digital epidemiology at EPFL, adds. “Helps all app users fight this pandemic.”

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New tool reveals security and privacy issues for contact tracking apps

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For more information:
Chris Wimant et al. Epidemiological effects of the NHS COVID-19 app, Nature (2021). DOI: 10.1038 / s41586-021-03606-z

Provided by
Federal Institute of Technology in Lausanne

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