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. 2022 Mar 12;124:72–78. doi: 10.1016/j.jhin.2022.02.024

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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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Maximum likelihood phylogeny of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) sequences with identified potential transmission clusters. A condensed maximum-likelihood phylogeny of SARS-CoV-2 sequences that were collected (marked with tip shapes) and a random sample of contemporaneous reference sequences (no tips) circulating within the Netherlands. Tip shapes are coloured according to the wards on which the healthcare workers (circle and square tips) and their within-department contacts (diamond tips) were working. The figure zooms in on two potential transmission clusters that were found.