Abstract
Urinary tract infections (UTIs) are a tremendous burden on the health care system due to the vast number of infections resulting in antibiotic therapy and/or hospitalization. Additionally, these infections are frequently caused by multidrug-resistant (MDR) organisms, limiting the availability of effective antimicrobials. Nacubactam is a novel non-β-lactam-β-lactamase inhibitor with in vitro activity against class A and class C β-lactamases. Nacubactam is being developed in combination with meropenem, providing broad-spectrum activity in addition to improved stability against common β-lactamases. Here, we utilized a neutropenic murine complicated UTI (cUTI) model to determine the potential clinical utility of meropenem-nacubactam compared with meropenem or nacubactam alone against 10 Klebsiella pneumoniae, Escherichia coli, and Enterobacter cloacae isolates with diverse genotypic and phenotypic profiles, including NDM, KPC, OXA, CTX-M, SHV, and TEM enzyme-producing isolates. Selected isolates had meropenem-nacubactam MICs between 1 and 8 μg/ml. Meropenem-nacubactam demonstrated the greatest in vivo efficacy against 9 of 10 isolates, achieving a ≥3 log reduction from the 48-h control in all isolates tested, including isolates pre...Continue Reading
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