Medicine & Health

MIT PRESS publishes new book on contact-tracing apps and public health

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IMAGE: Cover art to Susan Landau’s new book from The MIT PRESS.
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Credit: The MIT PRESS, 2021.

How do you stop a pandemic before a vaccine arrives?

Contact tracing is key, the first step in a process that has proven effective: trace, test, and isolate. Smartphones can collect some of the information required by contact tracers–not just where you’ve been but also who’s been near you. Can we repurpose the tracking technology that we carry with us–devices with GPS, Wi-Fi, Bluetooth, and social media connectivity–to serve public health in a pandemic? In “People Count: Contact-Tracing Apps and Public Health” (on sale now from The MIT PRESS), cybersecurity expert Susan Landau looks at some of the apps developed for contact tracing during the COVID-19 pandemic, finding that issues of effectiveness and equity intersect.

Landau explains the effectiveness (or ineffectiveness) of a range of technological interventions, including dongles in Singapore that collect proximity information; India’s biometric national identity system; Harvard University’s experiment, TraceFi; and China’s surveillance network. Other nations rejected China-style surveillance in favor of systems based on Bluetooth, GPS, and cell towers, but Landau explains the limitations of these technologies. She also reports that many current apps appear to be premised on a model of middle-class income and a job that can be done remotely. How can they be effective when low-income communities and front-line workers are the ones who are hit hardest by the virus? COVID-19 will not be our last pandemic; we need to get this essential method of infection control right.

About the Author:


Susan Landau is Bridge Professor of Cyber Security and Policy at The Fletcher School and at the School of Engineering, Department of Computer Science, at Tufts University. She is the coauthor of” Privacy on the Line”(MIT Press) and the author of “Surveillance or Security?”(MIT Press) and “Listening In: Cybersecurity in an Insecure Age.”

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