Acquisition of broad-spectrum cephalosporin resistance leading to colistin resistance in Klebsiella pneumoniae
Jayol, AurélieMedical and Molecular Microbiology, Emerging Antibiotic Resistance Unit, Department of Medicine, University of Fribourg, Switzerland
Nordmann, PatriceMedical and Molecular Microbiology, Emerging Antibiotic Resistance Unit, Department of Medicine, University of Fribourg, Switzerland - HFR - Hôpital Cantonal, Fribourg, Switzerland
Desroches, MarineDepartment of Virology, Bacteriology-Infect Control, Parasitology-Mycology, Assistance Publique-Hôpitaux de Paris, University Hospital Henri Mondor, Créteil, France - IAME, UMR 1137, INSERM, Paris, France
Decousser, Jean-WinocDepartment of Virology, Bacteriology-Infect Control, Parasitology-Mycology, Assistance Publique-Hôpitaux de Paris, University Hospital Henri Mondor, Créteil, France - IAME, UMR 1137, INSERM, Paris, France
Poirel, LaurentMedical and Molecular Microbiology, Emerging Antibiotic Resistance Unit, Department of Medicine, University of Fribourg, Switzerland
05.01.2016
Published in:
Antimicrobial Agents and Chemotherapy. - 2016, vol. 60, no. 5, p. 3199–3201
English
An extended-spectrum β-lactamase (ESBL)-producing and colistin-resistant Klebsiella pneumoniae clinical isolate was recovered from a patient who was treated with cefotaxime. This isolate harbored a blaCTX-M-15 ESBL gene that was associated with an ISEcp1 insertion sequence. Transposition of that tandem occurred within the chromosomal mgrB gene, leading to inactivation of the mgrB gene and consequently to acquired resistance to colistin. We showed here a coselection of colistin resistance as a result of a broad- spectrum cephalosporin selective pressure.