| Literature DB >> 28674059 |
Pablo A Fraile-Ribot1, Xavier Mulet1, Gabriel Cabot1, Ester Del Barrio-Tofiño1, Carlos Juan1, José L Pérez1, Antonio Oliver2.
Abstract
Resistance development to novel cephalosporin-β-lactamase inhibitor combinations during ceftazidime treatment of a surgical infection by Pseudomonas aeruginosa was investigated. Both initial (97C2) and final (98G1) isolates belonged to the high-risk clone sequence type (ST) 235 and were resistant to carbapenems (oprD), fluoroquinolones (GyrA-T83I, ParC-S87L), and aminoglycosides (aacA7/aacA8/aadA6). 98G1 also showed resistance to ceftazidime, ceftazidime-avibactam, and ceftolozane-tazobactam. Sequencing identified blaOXA-2 in 97C2, but 98G1 contained a 3-bp insertion leading to the duplication of the key residue D149 (designated OXA-539). Evaluation of PAO1 transformants producing cloned OXA-2 or OXA-539 confirmed that D149 duplication was the cause of resistance. Active surveillance of the emergence of resistance to these new valuable agents is warranted.Entities:
Keywords: Pseudomonas aeruginosa; ceftazidime-avibactam; ceftolozane-tazobactam; extended-spectrum OXA; multidrug resistance
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Year: 2017 PMID: 28674059 PMCID: PMC5571340 DOI: 10.1128/AAC.01117-17
Source DB: PubMed Journal: Antimicrob Agents Chemother ISSN: 0066-4804 Impact factor: 5.191