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. 2021 May 8;27:104248. doi: 10.1016/j.rinp.2021.104248

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© 2021 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. 12 — Variations of the susceptible, isolated, exposed, infectious, quarantined and removed population for the different values of $δ$ . The values of other parameters are $α_{E} = 0.004253392, α_{I} = 3.245065087, β^{- 1} = 0.0003351, γ^{- 1} = 0.1240579, r = 0.058306850$ and $d = 0.00414502$ .