colistin
Mechanisms of ResistanceResistance and Heteroresistance to Colistin in Pseudomonas aeruginosa Isolates from Wenzhou, ChinaThe goal was to investigate the mechanisms of colistin resistance and heteroresistance in Pseudomonas aeruginosa clinical isolates. Colistin resistance was determined by the broth microdilution method. Colistin heteroresistance was evaluated by population analysis profiling. Time-kill assays were also conducted. PCR sequencing was performed to detect the resistance...
Mechanisms of ResistanceProduction of Norspermidine Contributes to Aminoglycoside Resistance in pmrAB Mutants of Pseudomonas aeruginosaEmergence of resistance to polymyxins in Pseudomonas aeruginosa is mainly due to mutations in two-component systems that promote the addition of 4-amino-4-deoxy-l-arabinose to the lipopolysaccharide (LPS) through upregulation of operon arnBCADTEF-ugd (arn) expression. Here, we demonstrate that mutations occurring in different...
Clinical TherapeuticsClinical and Microbiological Outcomes in Obese Patients Receiving Colistin for Carbapenem-Resistant Gram-Negative Bloodstream InfectionCarbapenem-resistant infections are associated with poor outcomes, and treatment options are limited. Colistin is one of few antibiotics which retain in vitro activity against carbapenem-resistant pathogens. However, despite the availability of international consensus guidelines for the dosing of polymyxins, there are limited data on the effects of dosing on clinical outcomes among obese patients with carbapenem-resistant Gram-...
Mechanisms of ResistancePlasmid-Mediated mcr-1 Colistin Resistance in Escherichia coli from a Black Kite in RussiaThe gene mcr-1 conferring resistance to last-line antibiotic colistin has been reported globally. Here, we describe the first detection of plasmid-mediated colistin resistance in Russian wildlife, an isolate of Escherichia coli sequence type 2280 from a black kite (Milvus migrans) scavenging raptor. Whole-genome sequencing and plasmid transferability...
Mechanisms of ResistanceMutations in pmrB Confer Cross-Resistance between the LptD Inhibitor POL7080 and Colistin in Pseudomonas aeruginosaPseudomonas aeruginosa is a major bacterial pathogen associated with a rising prevalence of antibiotic resistance. We evaluated the resistance mechanisms of P. aeruginosa against POL7080, a species-specific, first-in-class antibiotic in clinical trials that targets the lipopolysaccharide transport...
Mechanisms of Resistancemcr-9, an Inducible Gene Encoding an Acquired Phosphoethanolamine Transferase in Escherichia coli, and Its OriginThe plasmid-located mcr-9 gene, encoding a putative phosphoethanolamine transferase, was identified in a colistin-resistant human fecal Escherichia coli strain belonging to a very rare phylogroup, the D-ST69-O15:H6 clone. This MCR-9 protein shares 33% to 65% identity with the other plasmid-encoded MCR-type enzymes identified (MCR-1 to -8) that have been found...
Mechanisms of ResistanceFunctional Characterization of a Miniature Inverted Transposable Element at the Origin of mcr-5 Gene Acquisition in Escherichia coliPlasmid-mediated colistin resistance of the mobile colistin resistance (MCR) type is a growing concern in Enterobacteriaceae since it has been described worldwide in humans and animals. Here, we identified a series of MCR-producing Escherichia coli isolates corresponding to two different clones (...
Editor's Pick Epidemiology and SurveillanceEscherichia coli Harboring mcr-1 in a Cluster of Liver Transplant Recipients: Detection through Active Surveillance and Whole-Genome Sequencingmcr-1, a plasmid-associated gene for colistin resistance, was first described in China in 2015, but its spread in the United States is unknown. We report detection of mcr-1-carrying Escherichia coli ST117 in a cluster of three liver transplant recipients.
Epidemiology and SurveillanceA Nationwide Screen of Carbapenem-Resistant Klebsiella pneumoniae Reveals an Isolate with Enhanced Virulence and Clinically Undetected Colistin HeteroresistanceThe convergence of hypervirulence and multidrug resistance in Klebsiella pneumoniae is a significant concern. Here, we report the first screen for hypermucoviscosity, a trait associated with increased virulence, using a U.S.
