Fig. 1

Dendogram of PFGE-XbaI profiles of 16 fluoroquinolone-resistant pre–prostate biopsy rectal Escherichia coli isolates. Analysis was made with BioNumerics software v6.6 (Applied Maths, Belgium) by th UPGMA alghoritm based on Dice similarity coefficients (optimization, 1.5%; position tolerance, 1.5%)