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PFGE patterns of genomic DNAs of E. cloacae isolates. Lane 1, molecular weight marker (lambda ladder PFG marker; New England BioLabs). ESBL-producing E. cloacae strains involved in the outbreak, lanes 3 to 6, 15, and 16 (belonging to clone A) and lanes 8 and 14 (designated clone B). Lanes 2, 7, and 9 to 13, unrelated strains of E. cloacae.
