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. 2020 May 22;13(6):849–855. doi: 10.1016/j.jiph.2020.05.014

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© 2020 The Authors

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. 3 — Simulation and prediction of the COVID-19 in mainland China. The initial values and parameters are S(0) = 1381411962, E(0) = 1720, I(0) = 1050, R(0) = 60, S_q(0) = 13953800, E_q(0) = 6973, I_q(0) = 4329, q₁ = 0.11, q₂ = 0.5, q₃ = 0.76, β = 1.14 × 10⁻⁹, ν = 0.15, α = 0.0021, σ = 0.63, γ(t) = 0.009 + 0.12/(1 + exp(4.7984 − 0.1448t)).