Fig. 1

Pulsed-field gel electrophoresis (PFGE) of XbaI-digested DNA from 83 ST131 E. coli isolates. Strain designation, Sample source, O serotype, H30 Rx and PFGE patterns are shown. Green box indicated the main cluster of ST131 H30 Rx isolates using 70% similarity cut-off value. Red box showed the two main clusters of O16 ST131 isolates at 63% similarity level