FIG 2.
PFGE files of BamHI-digested genomic DNA of isolates with plasmid-borne blaOXA-23 (A) and Southern blot hybridization with a blaOXA-23 probe (B). T1 and T2 indicate the transformants associated with the 78-kb and 50-kb plasmids, respectively. The two isolates carrying the 50-kb plasmid have an additional copy of blaOXA-23 on the chromosome; thus, the donors have one more hybridization signal than the transformants. Detailed information of other isolates is given in the Fig. 1 legend. Salmonella enterica serotype Braenderup strain H9812 DNA digested by XbaI was used as a molecular marker (in kb).