Aim: Acinetobacter bereziniae clinical relevance is starting to be recognized; however, very few descriptions of its carbapenem resistance currently exist. Here we characterize two carbapenem-resistant A. bereziniae isolates.
Materials & methods: Isolates were obtained from environmental and clinical samples. Carbapenemases were searched by phenotypic, biochemical and PCR assays. Clonality was studied by ApaI-PFGE and genetic location for carbapenemase genes were assessed by I-CeuI and S1 hybridizations.
Results: Isolates were not clonally related but both produced the 'exclusively Portuguese' IMP-5, with the clinical isolate also producing an OXA-58. The carbapenemase genes were plasmid located.
Conclusion: Our results emphasize the role of non-baumannii Acinetobacter species as important reservoirs of clinically relevant resistance genes that could also contribute to their emergence as nosocomial pathogens.
Keywords: Acinetobacter bereziniae; IMP-5; carbapenem resistance; integron; metallo-β-lactamase; oxacillinase.