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. 2021 Feb 24;18(175):20200954. doi: 10.1098/rsif.2020.0954

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© 2021 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — A depiction of automated contact tracing. The cross-section is denoted by the dashed circle and is of radius r₀/2. Interactions occur from t = 0 to t = t₀ + ε where ε ≪ t₀. A will be confirmed as COVID-19 positive in the future and C will be notified having come in contact with A. E might be notified if E stays in contact with A for a time period greater than t₀.