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PFGE types of ceftazidime-resistant E. cloacae isolates. Lane M, Staphylococcus aureus ATCC 8325 size marker; lanes 1, 2, and 3, EC-1 strain isolated from environmental, personnel, and patient cultures, respectively, with indistinguishable PFGE profiles; lane 4, EC-3 strain isolated from environmental cultures only, with a distinct PFGE profile.
