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. 2014 Jun 20;70(6):1411–1456. doi: 10.1007/s00285-014-0801-z

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© Springer-Verlag Berlin Heidelberg 2014

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 2 — Stability regions of the disease free and the endemic equilibrium in $(R_{1}, R_{2})$ -parameter plane for $r_{12} r_{21} \in (0, 1)$ when two regions are connected via bidirectional transportation. The curve is the stability boundary defined in (6.6). DFE denotes the disease free equilibrium and GAS denotes globally asymptotically stable