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. 2019 Mar 21;21(3):303. doi: 10.3390/e21030303

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© 2019 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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Comparison graphs for the Caputo, Caputo–Fabrizio, and the Atangana–Baleanu derivatives when $α = 0.5$ , where (a) Susceptible individuals, (b) Infected individuals, (c) recovered individuals, (d) deceased individuals, (e) Environment pathogens.