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. 2020 Nov 9;103:617–623. doi: 10.1016/j.ijid.2020.11.005

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© 2021 The Authors. Published by Elsevier Ltd on behalf of International Society for Infectious Diseases.

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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Time-varying reproduction number (R_t) of COVID-19 and SARS in China.

Panel A: R_t of COVID-19 nationwide; Panel B: R_t of COVID-19 in Wuhan; Panel C: R_t of secondary COVID-19 in Guangdong Province; Panel D: R_t of SARS in Guangdong Province; Panel E: R_t of SARS in Hong Kong; Panel F: R_t of SARS in Beijing.