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. 2021 Mar 23;82(6):276–316. doi: 10.1016/j.jinf.2021.03.013

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© 2021 The British Infection Association. Published by 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 — Phylogenetic tree analysis of SARS-CoV-2. (A) Sequencing data were uploaded to Nextclade (https://clades.nextstrain.org/) for phylogenetic analysis. The boxed regions show the sequencing data obtained in this analysis. (B) Evolution of SARS-CoV-2 clades over time. Schematic tree from Nextstrain showing clade evolution in Japan since February 2020. The arrows indicate the clades into which the 70 patients identified in our analysis were classified.