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. 2019 Dec 12;5:1–11. doi: 10.1016/j.idm.2019.12.002

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© 2019 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 1 — The solution trajectory of system (1) reaching $P_{4}$ with values from Table 2 starting from $(N_{1} (0), I_{1} (0), N_{2} (0), I_{2} (0)) = (900,200,10,5)$ and time $T = 7000$ days. In this case, the conditions above are giving the following equilibrium point $P_{4} : (281.87, 83.24, 2.28, 2.25)$ .