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. 2020 Jul 11;9:e00477. doi: 10.1016/j.sciaf.2020.e00477

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© 2020 The Author(s)

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. 4 — Simulations of system (2.6) for the total human population level as a function of time for R₀ < 1 with parameters set at $γ = 0.052, Λ_{T} = 0.02461, Λ_{B} = 0.0072, H_{0} = 0.0246, β_{\max} = 0.0001, β_{\min} = 0, p_{1} = 0.0016, α_{1} = 0.062, α_{2} = 0.00403, α_{3} = 0.547, σ = 0.0087, d = 0.975, μ = 0.000182, δ = 0.4351, ω_{0} = 1, ω_{1} = 0.9495, ω_{2} = 0.0263$ .