PFGE profiles of genomic DNAs West Lothian, Highland, and central Scotland outbreak isolates cleaved with XbaI (lanes 2 to 4), XhoI (lanes 5 to 7), NotI (lanes 8 to 10), and SfiI (lanes 11 to 13). Lanes 1 and 14, bacteriophage lambda concatemer size markers. The unnumbered lanes correspond to lanes 1 to 14 from left to right, respectively.