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. 2021 May 7;114:182–184. doi: 10.1016/j.jhin.2021.04.031

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© 2021 The Healthcare Infection Society. 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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Comparison of the number of cases and duration in hospital outbreaks of pre-existing severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) variants [non-variants of concern (non-VOC)] and SARS-CoV-2 VOC-202012/01. Horizontal lines on the violin plots correspond from bottom to top of box: 25^th, 50^th and 75^th percentiles. The whiskers extend to the minimum and maximum values. In addition, a rotated kernel density plot on each side shows peaks in the data.