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Ninety-six genetically diverse multidrug-resistant clinical isolates of Acinetobacter baumannii from 25 hospitals in 17 European countries were screened by PCR for specific carbapenemase-hydrolyzing class D β-lactamase (CHDL) genes and by PCR-based replicon typing for the presence of 19 different plasmid replicase (rep) gene homology groups (GRs). Results were confirmed by DNA sequencing where necessary. All 96 isolates contained at least 1 (with a maximum of 4) of the 19 groups of rep genes. Groups detected were GR6 (repAci6; 93 isolates), GR2 (including repAci1 [67 isolates] and repAci2 [3 isolates]), GR16 (repApAB49; 12 isolates), GR12 (p2ABSDF0001; 10 isolates), GR3 (repAci3; 4 isolates), GR4 (repAci4; 3 isolates), GR10 (repAciX; 1 isolate), and GR14 (repp4AYE; 1 isolate). Variations in rep gene content were observed even among epidemiologically related isolates. Genes encoding OXA-58-like CHDLs (22 isolates) were associated with carriage of the repAci1, repAci3, repAci4, and repAciX genes, genes encoding OXA-40-like CHDLs (6 isolates) were associated with repAci2 and p2ABSDF0001, and genes encoding OXA-23-like CHDLs (8 isolates) were associated with repAci1. Most intrinsic Acinetobacter plasmids are non-self-transferable, but the almost ubiquitous repAci6 gene was strongly associated with a potential tra locus that could serve as a general system for plasmid mobilization and consequent horizontal transmission of plasmids and their associated antibiotic resistance genes among strains of A. baumannii.

antimicrobial agents and chemotherapy

Distribution of Intrinsic Plasmid Replicase Genes and Their Association with Carbapenem-Hydrolyzing Class D β-Lactamase Genes in European Clinical Isolates of Acinetobacter baumannii