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. 2022 Apr 9;37:105481. doi: 10.1016/j.rinp.2022.105481

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© 2022 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. 1 — Impact of SARS-CoV-2 prevention ( $θ_{1}$ ) on individuals in $K_{C}^{h}$ and $K_{CZ}^{h}$ epidemiological classes. Here, $β_{1} = 0.2441, β_{2} = 0.02441, β_{2}^{h} = 0.200, β_{3} = 0.18, β_{2}^{v} = 0.501$ , so that $R_{0} = max {R_{0 C}, R_{0 Z}, R_{0 CZ}} = 1.1938 > 1$ .