Pulsed-field gel electrophoresis. Lanes: 1, 8, and 15, size markers; 10 and 12, isolates from nares surveillance cultures; 13, vascular catheter isolate; 2, 3, 5, 6, 7, and 11, nares surveillance cultures; 4 and 9, blood culture isolates; 14, hand culture isolate from a health care worker.