FIG 2.

Dendrogram of pulsed-field gel electrophoresis (PFGE) profiles of 12 fecal ST131 isolates from veterans and 4 reference ST131 clinical isolates. The dendrogram (as inferred according to the unweighted-pair group method with arithmetic averages) was based on Dice similarity coefficients from XbaI PFGE profiles. The four clinical isolates are reference isolates for the respective pulsotypes from a large private (mainly clinical) PFGE database (20). The 94% similarity threshold resolved five pulsotypes among the ST131 isolates (968, 800, 1225, 906, and 1630), four of which included ≥2 fecal isolates each and corresponded with pulsotypes from the clinical database, leaving only 1 fecal isolate (FC032) unmatched to a clinical isolate. FQ, fluoroquinolone phenotype (R, resistant; S, susceptible).