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Pulsed-field gel electrophoresis patterns of the isolates from four outbreaks. M, λ ladder; lanes 1 to 4, patients from outbreak 1; lanes 5 to 7, patients from outbreak 2; lane 8, stewed lamb from outbreak 2; lanes 9 and 10, patients from outbreak 3; lanes 11 and 12, patients from outbreak 4; lane 13, roast beef from outbreak 4. Restriction enzyme, NruI, pulse time of 0.47 to 30.82 s, 6.0 V/cm at 14°C for 20.18 h.
