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Cluster analysis of the 19 ESβLs-producing K. pneumoniae pulsed-field gel electrophoresis profiles. Lambda 48.5 kb concatamers (New England BioLabs, Beverly, MA) were used as size standard to align the bands. Date of isolation is also included. The scale bar at the top (left) indicates similarity coefficient (%). ESβLs, extended spectrum β-lactamases.
