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. 2020 Nov 30;9(12):431. doi: 10.3390/biology9120431

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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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The diagram displays $α^{(B)}$ regions with the appearance of a different equilibrium in terms of the basic reproduction numbers. This display is plotted by fixing the parameter values from Table 3 in Model (14).