File:Schematic of prospective contact tracing versus prospective and retrospective contact tracing.png

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Description	English: An illustration comparing prospective tracing only (A) against combined prospective and retrospective tracing (B). In both instances, Index Case #1 and Index Case #2 were infected at an (initially) undetected cluster event and detected through standard disease surveillance. The illustration demonstrates how the addition of retrospective tracing can break more transmission chains. In both instances some cases remain undetected due to limitations of contact tracing. This illustration was created by Adam Nagy and is originally available here. This image is a modification of a schematic originally found in Endo et al. “Implication of backward contact tracing in the presence of overdispersed transmission in COVID-19 outbreak.” Wellcome Open Research, (2020), doi: 10.12688/ wellcomeopenres.16344.1 Distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Date	24 November 2020
Source	Own work
Author	Adam Nagy

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	21:19, 24 November 2020		4,176 × 2,543 (483 KB)	Anagy2020	Uploaded own work with UploadWizard

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