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The structures of resistance islands identified in this study. AbaR4 islands of ST75 are subdivided into two subtypes, the D36 type and the AB210 type, according to the presence or absence of the tniD gene, resulting in different fragment sizes of primer set b in the first step of PCR mapping. Although AbaR4-like islands of ST138 isolates lacked the blaOXA-23-containing Tn2006, they were positive for the blaOXA-23 gene and one isolate (H10-103) possessed the complete structure of Tn2006.
