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Minimum spanning tree of 21 isolates from a neonatal intensive care unit in Graz from 2010 to 2013 (4, 7), and controls based on 2,536 target genes with pairwise ignore missing values. The close relatedness of all outbreak strains in MST cluster 1 is visible. Strains mentioned in the first outbreak investigation are colored cyan, isolates from the second one are colored blue. Control strains from either investigation are marked with the respective faded color.
