Fig. 2

Minimum Spanning Trees (MSTs) of the pairwise SNP distance of strains within the 5 predominant STs. Branches display the pairwise SNP distances, while nodes report the strains ID and are colored based on the hospital of origin, blue= P, green=H, salmon=S. Strains colored in red are strains described in a recent Italian outbreak [22]. A) ST307, constructed on a coreSNP of 773 bp; B) ST512/1519, constructed on a coreSNP of 489 bp; C) ST20, constructed on a coreSNP of 587 bp; D ST101, constructed on a coreSNP of 271 bp; E) ST258, constructed on a coreSNP of 229 bp