Figure 1. Pulsed-field gel electrophoresis of XbaI-digested DNA from 23 ST131 E. coli isolates.

The dendrogram was obtained with the UPGMA algorithm based on the Dice similarity coefficient and applying 1% of tolerance in the band position. Isolate designation, O:H serotype, virotype, PST, virulence-gene score, final lethality (mice dead within 7 days/mice challenged), and fimH subtype are shown on the right.