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. 2021 May 4;21:418. doi: 10.1186/s12879-021-06093-9

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Zoom in of the full phylogenetic tree on the Dutch LTCF residents from the LTCF in Sittard, the Netherlands, March 2020 (n = 14). The scale bar represents the number of substitutions per site. Sequences from the Netherlands are depicted in blue, and specific sequences from this study in red. Samples 13, 14, and 15 depicted in red were samples acquired from hospitalized patients in the regional hospital around the same time of the LTCF outbreak. The remaining red samples were acquired from eleven COVID-19 positive LTCF residents