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. 2021 Apr 7;23(4):e24389. doi: 10.2196/24389

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©Mark B Shapiro, Fazle Karim, Guido Muscioni, Abel Saju Augustine. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 07.04.2021.

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 the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Comparison of models that generate continuous R_t estimates. The three R_t estimates differ widely in the beginning of the COVID-19 pandemic. In particular, the R_t estimated using the rt.live model of Systrom, Vladeck, and Krieger [24] decreased to 1 at the onset at the lockdown on March 22, 2020 (shaded region). aSIR: adaptive Susceptible-Infectious-Removed.