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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 correctional facility A, Minnesota, USA, March 25–June 30, 2020. Filled circles represent sequences from samples from inmates, open circles represent sequences from samples from facility staff. 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.