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. 2020 Aug 12;140:110164. doi: 10.1016/j.chaos.2020.110164

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© 2020 Elsevier Ltd. All rights reserved.

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 — The cumulative number of confirmed cases of COVID-19 (empty circles) as a function of time for (a) Belgium, (b) Brazil, (c) UK, and (d) USA, excluding days with less than 100 infected. The black-continuous curves represent the function ∝ t^μ that fit the time-series, with exponent μ for each country. The insets display the same curves but in the log-log plot.