Alliance for Pandemic Preparedness

December 28, 2020

Digital proximity tracing app notifications lead to faster quarantine in non-household contacts results from the Zurich SARS-CoV-2 Cohort Study

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[pre-print; not peer-reviewed] Users of the SwissCovid digital contract tracing app who were notified of a non-household close contact with a SARS-CoV-2 quarantined a median of 1 day earlier than close contacts who were manually traced. Among a population-based sample of adult SARS-CoV-2 index cases (n=393) and close contacts (n=261) identified through manual contact tracing who were surveyed regarding use of the SwissCovid app, 88% of index cases reported receiving and uploading a notification code in the app to trigger a warning among proximity contacts. Among close contacts using the app, only 38% reported receiving an app warning due to the risk exposure. Non-household contacts notified by the app started quarantine on a median of day 2 following the exposure compared to day 3 among those not notified by the app.

Ballouz et al. (Dec 23, 2020). Digital proximity tracing app notifications lead to faster quarantine in non-household contacts results from the Zurich SARS-CoV-2 Cohort Study. Pre-print downloaded Dec 28 from https://doi.org/10.1101/2020.12.21.20248619