Pulsed-field gel electrophoresis patterns of OXA-48-producing K. pneumoniae isolates. Lanes: 1 to 3, three isolates of clone A harboring the blaOXA-48, blaOXA-9, blaSHV-12, and blaTEM-1 genes; 4 to 6, three isolates of clone B harboring the blaOXA-48, blaOXA-1, blaCTX-M-15, and blaTEM-1 genes; M, molecular mass markers.