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. 2020 Nov 16;6(4):e21168. doi: 10.2196/21168

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©Andrew McMahon, Nicole C Robb. Originally published in JMIR Public Health and Surveillance (http://publichealth.jmir.org), 16.11.2020.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Public Health and Surveillance, is properly cited. The complete bibliographic information, a link to the original publication on http://publichealth.jmir.org, as well as this copyright and license information must be included.

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A simple representation of the model. S_t represents the number of persons susceptible to infection who have had no prior infections on day t; I_t is the number of people currently infected for the first time on day t; R_t is the number of people who have recovered once on day t; I’_t is the number of people who have been infected 2 or more times and are infected on day t; R’_t is the number of people who have recovered 2 or more times and are not infected on day t of the model, and D_t is the number of deceased persons on day t of the model. Further symbols are defined in Table 1.