Fig. 1

The Phylogenetic tree of S. marcescens isolates across three outbreaks in Korea, India, and Germany. An UPGMA phylogenetic tree of S. marcescens isolates from the three outbreaks was generated using the 420,357 core SNP positions detected. The tree reveals the tight clustering of isolates from four patients and three razors in Korea (blue). The other brackets (orange for India, green for Cologne in Germany) annotate clusters described in the previous studies, and all clusters have the same isolates as observed in this study. The small box shows an ~ 100 times enlarged subtree of the clustered isolates. The scale bar and branch lengths are in the units of the number of base substitutions per site. The percentage of replicate trees in which the associated taxa clustered tighter in the bootstrap test (100 replicates) is shown close to the branches in the small box