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PFGE profiles of SpeI-digested genomic DNAs (left side) and of XbaI-digested genomic DNAs (right side) from S. marcescens isolates of the study (S51, S52, S53, S54, and S55) and a contemporary carbapenem-susceptible S. marcescens isolate (S47) from a patient hospitalized in the ICU before the study period. Lanes M, multimers of phage lambda DNA (48.5-kb) molecular mass markers.
