| Literature DB >> 33820773 |
Abigail M Rubio1, Ellen G Kline1, Chelsea E Jones1, Liang Chen2,3, Barry N Kreiswirth2, M Hong Nguyen1,4,5, Cornelius J Clancy1,4,6, Vaughn S Cooper7,8, Ghady Haidar1, Daria Van Tyne1, Ryan K Shields9,4,5.
Abstract
We compared the in vitro susceptibility of multidrug-resistant Pseudomonas aeruginosa isolates collected before and after treatment-emergent resistance to ceftolozane-tazobactam. Median baseline and postexposure ceftolozane-tazobactam MICs were 2 and 64 μg/ml, respectively. Whole-genome sequencing identified treatment-emergent mutations in ampC among 79% (11/14) of paired isolates. AmpC mutations were associated with cross-resistance to ceftazidime-avibactam but increased susceptibility to piperacillin-tazobactam and imipenem. A total of 81% (12/16) of ceftolozane-tazobactam-resistant isolates with ampC mutations were susceptible to imipenem-relebactam.Entities:
Keywords: Pseudomonas aeruginosa; antibiotic resistance; ceftolozane-tazobactam; imipenem-relebactam
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Year: 2021 PMID: 33820773 PMCID: PMC8315963 DOI: 10.1128/AAC.00084-21
Source DB: PubMed Journal: Antimicrob Agents Chemother ISSN: 0066-4804 Impact factor: 5.191