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. 2021 Aug;27(8):2052–2063. doi: 10.3201/eid2708.204838

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Phylogenetic tree of severe acute respiratory syndrome coronavirus 2 genome sequences associated with long-term care facility A, Minnesota, USA, April 15–June 11, 2020. Solid circles represent sequences in samples from residents; open circles represent sequences from samples from healthcare workers. IQ-TREE (29) was used with the general time reversible substitution model for tree generation. Branch lengths were scaled to represent number of single-nucleotide mutations, as shown in the scale. MDH, Minnesota Department of Health.