People Count, Book Reviewer: Technology, Data, Privacy, and Contact Tracing Applications



People Matter: Contact Tracing Applications and Public Health • By Susan Landau • MIT Press • 165 pages • ISBN: 978-0-262-04571-1 • $ 24.95

In March 2020, when contact tracing apps were first created, they struck me as a mirage – a fantasy embraced by the smartphone and jet-set class who wanted to believe that technology could do them. ignore the pandemic.

However, prejudice does not make good science, and in a pandemic, good science is what we need. Today, a year and a half later, in Number of people: contact tracing applications and public healthTufts University professor Susan Landau set out to do a sober assessment.

You must feel for her here, because writing a book on such a quick topic is a bit like trying to nail the ceiling. Landau completed his book in the fall of 2020. At this point, many countries were too locked down for contact tracing apps to matter much; now everyone is focusing on vaccinations.

It begins with a general history of contact tracing, moves on to technology-enhanced contact tracing, the conflict between contact tracing and privacy, and an assessment of the effectiveness of contact tracing applications, and then follows. ends with a brief discussion of the future.

The big conflict in the spring of 2020 was whether contact tracing apps should be centralized or decentralized, that is, whether they should collect user data in a giant government-run database or keep records. data locally on each user’s phone, to be shared only with that. user agreement following a positive test.

Landau follows this story and the near universal adoption of the decentralized GAEN (Google-Apple Exposure Notification) platform now used by almost all applications. Landau leaves out two non-American parts of the story. The first is the pan-European effort (including UCL in the UK), DP-3T, which developed open source protocols protecting privacy whose principles were similar to GAEN’s final design. The second is the 2011 FluPhone project, led by Jon Crowcroft and Eiko Yoneki in Cambridge, which established that the use of cellphones can provide real-time measurements of social activity and help identify super-spreaders via infections appearing around them.

Trust and local context

Landau concludes that while contact tracing apps can clearly help reduce the breeding base by uncovering cases that, without help, people cannot, so can human contact tracing. As an example, she cites the Fort Apache Indian Reservation in Arizona, which ignored testing in favor of looking for symptoms such as low oxygen saturation. The result, despite numerous infections, was a lower death rate than the surrounding state.

Trust and understanding of the local context is essential, as is ensuring that public health infrastructure is working for those who need it most. A better approach than GAEN, she argues, is to create applications that help contract tracers; she cites the NHS app that collects QR code records as an example.

Now, as things can open up, this is the time when contact tracing apps might have a bigger role to play. We should, Landau concludes, have the public debate on how and when these tools should be used, which we did not have last year. This pandemic will end, but it will not be the last. We need to prepare now.


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