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Pulsed-field gel electrophoresis of vancomycin-resistant isolates. M, molecular weight marker; lane 1, isolate from index case 1; lane 2, isolate from index case 2; lane 3, isolate from contact patient 1; lanes 4 to 6, isolates from environment; lane 7, isolate from index case 2; lane 8, isolate from contact patient 2; lanes 9 and 10, isolates from environment; lane 11, isolate from contact patient 3.
