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The rise in antimicrobial resistance poses a significant threat to global health, particularly among diabetic patients who are prone to urinary tract infections (UTIs). Pathogens that cause UTI among diabetic patients exhibit significant multidrug resistance (MDR) patterns, necessitating more precise empirical treatment strategies..

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Restoring ceftolozane susceptibility: a role for diazabicyclooctane β-lactamase inhibitors?

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Department of Medicine, Division of Infectious Diseases, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.

Paired baseline and post-exposure isolates from 34 patients who developed ceftolozane-tazobactam (TOL-TAZ) resistance following treatment of multidrug-resistant (MDR) infections were analyzed to determine if ceftolozane with an alternative β-lactamase inhibitor could restore susceptibility. The median baseline TOL-TAZ MIC was 2 mg/L; 88% of post-exposure isolates harbored new mutations. Median MIC fold-increase from baseline was 32-, 24-, 16-, and 6-fold for ceftolozane-tazobactam, ceftolozane-avibactam (AVI), ceftolozane-relebactam (REL), and ceftolozane-durlobactam (DUR), respectively.

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