Emergence of Carbapenem-Resistant Non-baumannii Species of Acinetobacter Harboring a blaOXA-51-Like Gene That Is Intrinsic to A. baumannii

The bla(OXA-51)-like gene, originally intrinsic to Acinetobacter baumannii, had been detected in two clones of Acinetobacter nosocomialis and one clone of Acinetobacter genomic species Close to 13TU. These bla(OXA-51)-like genes, all preceded by ISAbal, were located on plasmids that might have originated with A. baumannii. The plasmid-borne ISAbal-blac(OXA-51)-like confers a high level of carbapenem resistance and affects the accuracy of using bla(OXA-51)-like detection as a tool for differentiating A. baumannii from other Acinetobacter species.