How does the tracking work?
The process involves identifying contaminated people, so that measures can be taken to prevent the spread of infection on to others.
It is all the more important in cases when the sick person has no symptoms and may not even know they are sick.
Once the infected person is identified, efforts are made to locate and test the people they have been in contact with within the past two weeks. If one of those contacts is found to be infected, the investigation starts again.
Trying to find chains of contamination could be a long process.
What are some of the challenges of contact tracing?
In Switzerland, as in many other countries, the challenge is to establish an effective tracking system, while respecting data protection.
Since mobile phones would be used, various technical and legal questions could arise, particularly on the collection and use of data.
In Switzerland, to process this information in the context of the pandemic, either the consent of the individual or an anonymisation of the data is required.
What tools will Switzerland be using for post-confinement contact tracing?
One possibility would be the tracking by GPS of mobile phones, as already implemented in a partnership between the federal government and Swisscom. This method allowed the authorities to monitor the public to see if they complied with the restrictions related to going out and traveling during the Easter holidays.
But the government is now supporting a brand new project at the Ecole Polytechnique Fédérale de Lausanne (EPFL) and its sister institution, Zurich’s Eidgenössische Technische Hochschule (ETHZ).
Both are working on the so-called D3-PT project, a free downloadable application for mobile phones, which will run on Google’s Android operating system and on Apple’s iOS.
Its goal, according to Edouard Bugnion, professor of computer science at EPFL, is to “break the chain of virus transmission” by identifying new cases and isolating them. If a person is found positive for coronavirus, all the people he has encountered in the previous days will be alerted, so that they can go into quarantine and be tested.
No exact details or launch date have been released yet, but the Federal Council thinks the D3-PT tracing would work well in Switzerland.
Will this system guarantee privacy?
Until very recently, the two institutions participated in the European research project Pan-European Privacy-Preserving Proximity Tracing, bringing together 130 organisations from eight countries.
But EPFL and ETHZ distanced themselves from this project after realising that user data would not be protected, and went on launch the D3-PT system which, they said, would be more “decentralised and transparent”.
The idea of a COVID contact tracing app isn't dead – quite the opposite! There is now a healthy debate about the best approach. I strongly favor a decentralized approach.
Public debate creates consensus, transparency creates trust.
My current favorite: https://t.co/9musLmKtYy
— Marcel Salathé (@marcelsalathe) April 20, 2020