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. 2017 Mar 1;420:18–25. doi: 10.1016/j.jtbi.2017.02.020

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© 2017 Published by Elsevier Ltd.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 7 — The epidemic threshold $ρ_{c, I}^{0}$ versus γ_S. The epidemiological parameters are set at $β = 0.1$ and $μ = 0.2$ . The mobility rates are set the same at $D_{S} = D_{A} = D_{I} = 1$ . The other parameters are the same as in Fig. 2.