Informing Antibiotic Treatment Decisions: Evaluating Rapid Molecular Diagnostics To Identify Susceptibility and Resistance to Carbapenems against Acinetobacter spp. in PRIMERS III.

Journal Article (Journal Article)

The widespread dissemination of carbapenem-resistant Acinetobacter spp. has created significant therapeutic challenges. At present, rapid molecular diagnostics (RMDs) that can identify this phenotype are not commercially available. Two RMD platforms, PCR combined with electrospray ionization mass spectrometry (PCR/ESI-MS) and molecular beacons (MB), for detecting genes conferring resistance/susceptibility to carbapenems in Acinetobacter spp. were evaluated. An archived collection of 200 clinical Acinetobacter sp. isolates was tested. Predictive values for susceptibility and resistance were estimated as a function of susceptibility prevalence and were based on the absence or presence of beta-lactamase (bla) NDM, VIM, IMP, KPC, and OXA carbapenemase genes (e.g., blaOXA-23, blaOXA-24/40, and blaOXA-58 found in this study) against the reference standard of MIC determinations. According to the interpretation of MICs, 49% (n = 98) of the isolates were carbapenem resistant (as defined by either resistance or intermediate resistance to imipenem). The susceptibility sensitivities (95% confidence interval [CI]) for imipenem were 82% (74%, 89%) and 92% (85%, 97%) for PCR/ESI-MS and MB, respectively. Resistance sensitivities (95% CI) for imipenem were 95% (88%, 98%) and 88% (80%, 94%) for PCR/ESI-MS and MB, respectively. PRIMERS III establishes that RMDs can discriminate between carbapenem resistance and susceptibility in Acinetobacter spp. In the context of a known prevalence of resistance, SPVs and RPVs can inform clinicians regarding the best choice for empiric antimicrobial therapy against this multidrug-resistant pathogen.

Full Text

Duke Authors

Cited Authors

  • Evans, SR; Hujer, AM; Jiang, H; Hill, CB; Hujer, KM; Mediavilla, JR; Manca, C; Tran, TTT; Domitrovic, TN; Higgins, PG; Seifert, H; Kreiswirth, BN; Patel, R; Jacobs, MR; Chen, L; Sampath, R; Hall, T; Marzan, C; Fowler, VG; Chambers, HF; Bonomo, RA

Published Date

  • January 2017

Published In

Volume / Issue

  • 55 / 1

Start / End Page

  • 134 - 144

PubMed ID

  • 27795336

Pubmed Central ID

  • PMC5228224

Electronic International Standard Serial Number (EISSN)

  • 1098-660X

Digital Object Identifier (DOI)

  • 10.1128/JCM.01524-16


  • eng

Conference Location

  • United States