A Clinical Case of Treatment-Emergent Acinetobacter baumannii Non-Susceptibility to Sulbactam-Durlobactam.

Sharara, Sima L; Diaz, Lorena; Asempa, Tomefa E; Martinez, Jose R W; Canales, Nicolas; Bergman, Yehudit; Murphy, Shannon G; Karaba, Sara M et al. · Clin Infect Dis · 2026

case_report · Level V

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Abstract

We report an eightfold increase in sulbactam-durlobactam MICs in a carbapenem-resistant Acinetobacter baumannii cerebrospinal fluid isolate recovered after 14 days of sulbactam-durlobactam plus meropenem therapy. Treatment-emergent mutations in the AdeFGH efflux system were identified, accompanied by a 166-fold increase in adeG expression. Efflux pump inhibition restored sulbactam-durlobactam susceptibility.