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Gram-negative bacteria

  • Open Access
    Comparison of Agar Dilution to Broth Microdilution for Testing <em>In Vitro</em> Activity of Cefiderocol against Gram-Negative Bacilli
    Bacteriology
    Comparison of Agar Dilution to Broth Microdilution for Testing In Vitro Activity of Cefiderocol against Gram-Negative Bacilli

    Cefiderocol (CFDC) is a siderophore cephalosporin with activity against Gram-negative bacterial species that are resistant to carbapenems and other drugs. The MICs of CFDC were determined for 610 Gram-negative bacilli, including 302 multinational Enterobacterales isolates with characterized mechanisms of beta-lactam resistance, 180 clinical isolates from the Mayo Clinic and Mayo Clinic Laboratories not characterized for...

    Mariana Albano, Melissa J. Karau, Audrey N. Schuetz, Robin Patel
  • Impact of Rapid Antimicrobial Susceptibility Testing in Gram-Negative Rod Bacteremia: a Quasi-experimental Study
    Bacteriology
    Impact of Rapid Antimicrobial Susceptibility Testing in Gram-Negative Rod Bacteremia: a Quasi-experimental Study

    Clinical justification for rapid antimicrobial susceptibility testing (AST) in Gram-negative rod (GNR) bacteremia is compelling; however, evidence supporting its value is sparse. We investigated the impact of rapid AST on clinical and antimicrobial stewardship outcomes in real-world practice. We performed a before-and-after quasi-experimental study from February 2018 to July 2019 at a tertiary hospital of the 24-h/day, 7-day/week...

    Catherine Anne Hogan, Bertrand Ebunji, Nancy Watz, Kristopher Kapphahn, Joseph Rigdon, Emily Mui, Lina Meng, William Alegria, Marisa Holubar, Stanley Deresinski, Niaz Banaei
  • Open Access
    Evaluation of the Revogene Carba C Assay for Detection and Differentiation of Carbapenemase-Producing Gram-Negative Bacteria
    Bacteriology
    Evaluation of the Revogene Carba C Assay for Detection and Differentiation of Carbapenemase-Producing Gram-Negative Bacteria

    The Revogene Carba C assay (formerly GenePOC Carba assay) is a multiplex nucleic acid-based in vitro diagnostic test intended for the detection of carbapenemase-producing Enterobacterales (CPE) from cultured colonies. This assay was evaluated directly on colonies of 118 well-characterized Enterobacterales with reduced susceptibility to carbapenems and on 49 multidrug-resistant (MDR)...

    Delphine Girlich, Marine Laguide, Laurent Dortet, Thierry Naas
  • Evaluation of Calcium-Enhanced Media for Colistin Susceptibility Testing by Gradient Agar Diffusion and Broth Microdilution
    Bacteriology
    Evaluation of Calcium-Enhanced Media for Colistin Susceptibility Testing by Gradient Agar Diffusion and Broth Microdilution

    Despite the increasing reliance on polymyxin antibiotics (polymyxin B and colistin) for treatment of multidrug-resistant Gram-negative infections, many clinical laboratories are unable to perform susceptibility testing due to the lack of accurate and reliable methods. Although gradient agar diffusion is commonly performed for other antimicrobials, its use for polymyxins is discouraged due to poor performance characteristics.

    ...
    Daniel A. Green, Nenad Macesic, Anne-Catrin Uhlemann, Mabel Lopez, Stephania Stump, Susan Whittier, Audrey N. Schuetz, Patricia J. Simner, Romney M. Humphries
  • Growth of Clinically Important Gram-Negative Bacteria on MacConkey Agar under Aerobic versus CO<sub>2</sub>-Enriched Environment
    Letter to the Editor
    Growth of Clinically Important Gram-Negative Bacteria on MacConkey Agar under Aerobic versus CO2-Enriched Environment
    Mohammad Rubayet Hasan, Mohammed Suleiman, Elizabeth Ilagan, Nigel Crouch, Andres Perez Lopez, Eva Thomas, Patrick Tang
  • Open Access
    Detection of Colistin Resistance in <span class="named-content genus-species" id="named-content-1">Escherichia coli</span> by Use of the MALDI Biotyper Sirius Mass Spectrometry System
    Bacteriology
    Detection of Colistin Resistance in Escherichia coli by Use of the MALDI Biotyper Sirius Mass Spectrometry System

    Polymyxin antibiotics are a last-line treatment for multidrug-resistant Gram-negative bacteria. However, the emergence of colistin resistance, including the spread of mobile mcr genes, necessitates the development of improved diagnostics for the detection of colistin-resistant organisms in hospital settings.

    R. Christopher D. Furniss, Laurent Dortet, William Bolland, Oliver Drews, Katrin Sparbier, Rémy A. Bonnin, Alain Filloux, Markus Kostrzewa, Despoina A. I. Mavridou, Gerald Larrouy-Maumus
  • Antimicrobial Susceptibility Testing for Polymyxins: Challenges, Issues, and Recommendations
    Minireview
    Antimicrobial Susceptibility Testing for Polymyxins: Challenges, Issues, and Recommendations

    Polymyxins, including polymyxin B and polymyxin E (colistin), are now increasingly being used worldwide to treat patients with multidrug-resistant (MDR) Gram-negative bacterial infections. This necessitates that laboratories employ an accurate and reliable method for the routine performance of polymyxin susceptibility testing.

    Fereshteh Ezadi, Abdollah Ardebili, Reza Mirnejad
  • Bacteriology
    Risk Factors for Colistin Resistance among Gram-Negative Rods and Klebsiella pneumoniae Isolates
    Stefan E. Richter, Loren Miller, Daniel Z. Uslan, Douglas Bell, Karol Watson, Romney Humphries, James A. McKinnell
  • Bacteriology
    Multicenter Evaluation of the Xpert Carba-R Assay for Detection of Carbapenemase Genes in Gram-Negative Isolates

    This multicenter study evaluated the performance of the Cepheid Xpert Carba-R assay, a qualitative PCR test designed for the rapid detection of blaKPC, blaNDM, blaVIM, blaIMP, and blaOXA-48 carbapenem resistance genes from bacterial isolates grown on blood agar or MacConkey agar. The results were compared to those obtained from...

    Maria M. Traczewski, Edoardo Carretto, Rafael Canton, Nicholas M. Moore, for the Carba-R Study Team
  • Bacteriology
    Direct-from-Blood-Culture Disk Diffusion To Determine Antimicrobial Susceptibility of Gram-Negative Bacteria: Preliminary Report from the Clinical and Laboratory Standards Institute Methods Development and Standardization Working Group
    Sukantha Chandrasekaran, April Abbott, Shelley Campeau, Barbara L. Zimmer, Melvin Weinstein, Lauri Thrupp, John Hejna, Lindsey Walker, Tracy Ammann, Thomas Kirn, Robin Patel, Romney M. Humphries

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