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. 2020 May 16;9(5):100. doi: 10.3390/biology9050100

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Values of $R_{c}$ in the plane $(q, c)$ for different values of the time for diagnosis ( $1 / δ_{I}$ ). The red line corresponds to $R_{c} = 1$ (with dashed lines showing confidence intervals).