NDM
SusceptibilityIn Vitro Activity of Cefiderocol, a Siderophore Cephalosporin, against Multidrug-Resistant Gram-Negative BacteriaCefiderocol is a parenteral siderophore cephalosporin with a catechol-containing 3′ substituent. We evaluated its MICs against Gram-negative bacteria, using iron-depleted Mueller-Hinton broth. The panel comprised 305 isolates of Enterobacterales, 111 of Pseudomonas aeruginosa, and 99 of ...
Mechanisms of ResistanceGenetic Features Leading to Reduced Susceptibility to Aztreonam-Avibactam among Metallo-β-Lactamase-Producing Escherichia coli IsolatesMetallo-β-lactamase (MBL)-producing Escherichia coli isolates resistant to the newly developed β-lactam/β-lactamase inhibitor drug combination aztreonam-avibactam (ATM-AVI) have been reported. Here, we analyzed a series of 118 clinical MBL-producing E. coli isolates of various geographical origins...
SusceptibilityAntibiotic Susceptibility of NDM-Producing Enterobacterales Collected in the United States in 2017 and 2018The treatment of infections caused by carbapenem-resistant Enterobacterales, especially New Delhi metallo-β-lactamase (NDM)-producing bacteria, is challenging. Although less common in the United States than some other carbapenemase producers, NDM-producing bacteria are a public health threat due to the limited treatment options available. Here, we report on the antibiotic susceptibility of 275 contemporary NDM-producing ...
Challenging Clinical Case in Antimicrobial ResistanceSimultaneous Infection with Enterobacteriaceae and Pseudomonas aeruginosa Harboring Multiple Carbapenemases in a Returning Traveler Colonized with Candida aurisWe report our clinical experience treating a critically ill patient with polymicrobial infections due to multidrug-resistant Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa in a 56-year-old woman who received...
Mechanisms of ResistanceImprovement of the Immunochromatographic NG-Test Carba 5 Assay for the Detection of IMP Variants Previously UndetectedHere, we evaluated the immunochromatographic assay NG-Test Carba 5v2 (NG-Biotech), with improved IMP variant detection on 31 IMP producers, representing the different branches of the IMP phylogeny, including 32 OXA-48, 19 KPC, 12 VIM, 14 NDM, and 13 multiple carbapenemase producers (CPs), 13 CPs that were not targeted, and 13 carbapenemase-negative isolates. All tested IMP variants were accurately detected without impairing detection of...
Experimental TherapeuticsExploring Aztreonam in Combination with Ceftazidime-Avibactam or Meropenem-Vaborbactam as Potential Treatments for Metallo- and Serine-β-Lactamase-Producing EnterobacteriaceaeMetallo-β-lactamase (MBL)-producing Enterobacteriaceae, particularly those that coharbor serine β-lactamases, are a serious emerging public health threat given their rapid dissemination and the limited number of treatment options. Preclinical and anecdotal clinical data support the use of aztreonam in combination with ceftazidime-avibactam against these pathogens, but other aztreonam-based combinations have not been explored....
Mechanisms of ResistanceEvaluation of the Immunochromatographic NG-Test Carba 5 for Rapid Identification of Carbapenemase in NonfermentersThe immunochromatographic assay NG-Test Carba 5 (NG-Biotech) was evaluated with a collection of 107 carbapenemase-producing nonfermenters (CP-NF) (55 Pseudomonas spp., 51 Acinetobacter spp., and 1 Achromobacter xylosoxidans isolate) and 61 carbapenemase-negative isolates. All KPC, VIM, and...
Mechanisms of ResistanceNG-Test Carba 5 for Rapid Detection of Carbapenemase-Producing Enterobacterales from Positive Blood CulturesThe immunochromatographic assay, NG-test Carba 5 (NG Biotech), has been evaluated for detection of carbapenemase-producing Enterobacterales (CPE) from spiked blood cultures (n = 205). It detected and discriminated in less than 30 minutes KPC, IMP, VIM, NDM, and OXA-48-like producers with a sensitivity and specificity of 97.7% and 96.1%, respectively.
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SusceptibilityAztreonam plus Clavulanate, Tazobactam, or Avibactam for Treatment of Infections Caused by Metallo-β-Lactamase-Producing Gram-Negative BacteriaMetallo-β-lactamase (MBL)-producing Gram-negative bacteria are often extremely resistant, leading to a real therapeutic dead end. Here, we evaluated the in vitro and in vivo efficacy of aztreonam in combination with ceftazidime-avibactam, ceftolozane-tazobactam, or amoxicillin-clavulanate for the treatment of infections caused by MBL-producing ...
