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. 2019 Mar 6;470:20–29. doi: 10.1016/j.jtbi.2019.03.004

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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. 2. — Infectious disease transmission at different travel rates. (a) $R_{0} = 1.8$ . The red line depicts the source city and the black line depicts the downstream city; the x-axis shows the time (day); the y-axis shows the percentage of infected people; and the number on the right side of the figure is the value of $Δ P_{c_{s}}^{c_{d}}$ . (b) Different values of R₀ (1.5, 1.8 and 2.5)*.

* With different values of R₀, n_p and γ remain constant and only β changes.