XbaI PFGE patterns of the isolates. (a-e) Highlighting of the isolate code indicates cipro64 (red), cipro0.5 (yellow) and cipro0.032 (not highlighted). Grey indicates that the sample is excluded from the study. Panels a - e are parts of a single image which has been divided for convenience of presentation. The left border of panel a is the right border of panel b, and so forth. Clone numbers are placed between the dendrogram and the gel pictures. In a few cases, patterns grouped with a clone in the dendrogram do not satisfy our criteria for clone inclusion (<7 bands difference from the prototype). Therefore the number of patterns marked may differ from the number given in Table 2.