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. 2021 Apr 19:1–2. doi: 10.1017/ice.2021.185

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© The Society for Healthcare Epidemiology of America 2021

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means subject to acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 1. — Unweighted pair group method with arithmetic mean reference (UPGMA) clustering analysis allows for a global visualization of samples under investigation and a means to assess relatedness across suspected clusters. Relatedness of samples within clusters was based on the symmetric difference calculations: Clusters 1, 2: related (samples 1–4, 6, 7); sample 5 was not included due to low coverage. Cluster 20: related (samples 49, 51, 52); unrelated (samples 53, 54); sample was 50 not included due to low coverage. Cluster 24: unrelated (samples 65–67).