Antimicrobial activity of sulbactam-durlobactam against Acinetobacter baumannii-calcoaceticus complex strains causing non-respiratory and non-bloodstream infections from the United States (2023-2025)
Recommended Citation
Cyr E, Argotsinger J, Beck ET, Chamberland RR, Clark AE, Daniels AR, Liesman R, Fisher M, Gialanella P, Hand J, Harrington AT, Humphries RM, Huse H, Hamilton-Seth R, Hankins JD, Kufel WD, Riddell SW, Mehta M, Demkowicz R, Mochon AB, Salimnia H, Khan A, Pierce VM, Potula R, Tekle T, Simner PJ, Tibbetts RJ, Vu C, Abbo LM, Martinez O, Dumm RE, Mutnal MB, Jenkins TC, Chávez V, Pinargote P, Bowling J, Munson E, Zurawski DV, Nicolau DP, Asempa TE. Antimicrobial activity of sulbactam-durlobactam against Acinetobacter baumannii-calcoaceticus complex strains causing non-respiratory and non-bloodstream infections from the United States (2023-2025). Microbiol Spectr. 2026;e0328925.
Document Type
Article
Publication Date
3-23-2026
Publication Title
Microbiol Spectr
Keywords
Acinetobacter; CRAB; meropenem; sulbactam-durlobactam
Abstract
Acinetobacter baumannii most often causes pneumonia in critically ill patients. However, A. baumannii is also an important cause of a broader range of infections, including skin/wound and urinary tract infections. This study aims to evaluate the in vitro activity of sulbactam-durlobactam and comparator antibiotics, including meropenem and cefiderocol against A. baumannii-calcoaceticus complex isolates from non-respiratory and non-bloodstream sources. Samples included 285 A. baumannii-calcoaceticus complex isolates enriched for carbapenem resistance collected across 17 states in the United States (January 2023-May 2025). Antimicrobial susceptibility tests were conducted by manual broth microdilution and interpreted according to Clinical and Laboratory Standards Institute (CLSI) and Food and Drug Administration (FDA) (cefiderocol) standards. A. baumannii complex isolates were primarily cultured from skin/wound (58.6%), urinary tract (31.6%), and other sources (9.8%), including cerebrospinal and peritoneal fluid. Carbapenem resistance was observed in approximately 70% of isolates and more common among skin/wound cultures. Sulbactam-durlobactam was observed to be highly active (96.9% susceptible [S]; MIC(90) 4 mg/L) and demonstrated greater activity than sulbactam (37.9% S; MIC(90) 32 mg/L). Sulbactam-durlobactam also displayed high susceptibility rates across isolate sources, ranging from 96.4 (skin/wound) to 97.8% (urine). Cefiderocol demonstrated similar in vitro activity across culture sources and patient location, inhibiting >90 and >80% of isolates at CLSI and FDA susceptible breakpoints, respectively. Minocycline susceptibility was 69.1%, while tigecycline and eravacycline MICs(50/90) were ¼ and 0.5/1 mg/L, respectively. The observed data are consistent with results from surveillance studies among respiratory and bloodstream isolates and show that sulbactam-durlobactam demonstrates potent in vitro activity against clinical A. baumannii complex isolates from a variety of culture sources.
IMPORTANCE: Acinetobacter baumannii is a difficult-to-treat pathogen that often affects hospitalized patients and is known for a high level of multi-drug resistance. While commonly associated with pneumonia, it also causes infections in wounds, the urinary tract, and other parts of the body. This study shows that sulbactam-durlobactam is highly effective against A. baumannii from various infection sites. The results are important because they can inform clinicians on the susceptibility profiles of A. baumannii from a variety of infection sources, not just lung and bloodstream. As new antibiotics come onto the market, it is important to continuously assess resistance patterns to inform patient and system-wide health decisions.
PubMed ID
41869812
ePublication
ePub ahead of print
First Page
0328925
Last Page
0328925
