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https://www.readbyqxmd.com/read/29339389/in-vitro-antibiotic-susceptibility-pattern-of-non-diphtheriae-corynebacterium-in-ontario-2011-2016
#1
Alefiya Neemuchwala, Deidre Soares, Vithusha Ravirajan, Alex Marchand-Austin, Julianne V Kus, Samir N Patel
Non-diphtheriae Corynebacterium-associated disease has been increasingly observed and often presents a conundrum to the treating physician. Analysis of antibiotic susceptibility test data for 1,970 clinical Corynebacterium isolates received between 2011 and 2016 revealed that empiric drug treatment options are limited to vancomycin and linezolid. Corynebacterium striatum was the most frequently observed species during this study period along with C. amycolatum and C. pseudodiphtheriticum/propinquum. Low levels of susceptibility to penicillin (14...
January 16, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29339387/the-genetic-basis-of-emerging-vancomycin-linezolid-and-daptomycin-heteroresistance-in-a-case-of-persistent-enterococcus-faecium-bacteremia
#2
Kieran Chacko, Mitchell Sullivan, Colleen Beckford, Deena Altman, Brianne Ciferri, Theodore Pak, Robert Sebra, Andrew Kasarskis, Camille Hamula, Harm van Bakel
Whole-genome sequencing was used to examine a persistent E. faecium bacteremia that acquired heteroresistance to three antibiotics in response to prolonged multidrug therapy. Comparison of complete genomes before and after each change revealed the emergence of known resistance determinants for vancomycin and linezolid, and suggested that a novel mutation in fabF, encoding a fatty acid synthase, was responsible for daptomycin nonsusceptibility. Plasmid recombination contributed to progressive loss of vancomycin resistance after withdrawal of the drug...
January 16, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29337066/listeria-monocytogenes-endocarditis-case-report-review-of-the-literature-and-laboratory-evaluation-of-potential-novel-antibiotic-synergies
#3
Monika Kumaraswamy, Carter Do, George Sakoulas, Poochit Nonejuie, Guan Woei Tseng, Helen King, Joshua Fierer, Joe Pogliano, Victor Nizet
Endocarditis is a rare but serious manifestation of Listeria monocytogenes (LM). However, the optimal treatment strategy for LM endocarditis has yet to be established. Current antibiotic strategies for listeriosis include penicillin G or ampicillin (AMP) monotherapy, or AMP + gentamicin combination therapy which is often favored for endocarditis. The primary objective of our investigation was to assess the utility of AMP + ceftriaxone (CRO) and AMP + daptomycin (DAP) against LM, modeling less nephrotoxic antibiotic combinations traditionally used to manage resistant enterococcal endocarditis...
January 11, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29331890/deep-sequence-analysis-reveals-the-ovine-rumen-as-a-reservoir-of-antibiotic-resistance-genes
#4
Thomas C A Hitch, Ben J Thomas, Jessica C A Friedersdorff, Helen Ougham, Christopher J Creevey
Antibiotic resistance is an increasingly important environmental pollutant with direct consequences for human health. Identification of environmental sources of antibiotic resistance genes (ARGs) makes it possible to follow their evolution and prevent their entry into the clinical setting. ARGs have been found in environmental sources exogenous to the original source and previous studies have shown that these genes are capable of being transferred from livestock to humans. Due to the nature of farming and the slaughter of ruminants for food, humans interact with these animals in close proximity, and for this reason it is important to consider the risks to human health...
January 11, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29331166/institution-wide-and-within-patient-evolution-of-daptomycin-susceptibility-in-vancomycin-resistant-enterococcus-faecium-bloodstream-infections
#5
Robert J Woods, Twisha S Patel, Jerod L Nagel, Duane W Newton, Andrew F Read
We report daptomycin minimum inhibitory concentrations (MICs) for vancomycin-resistant Enterococcus faecium isolated from bloodstream infections over a 4-year period. The daptomycin MIC increased over time hospital-wide for initial isolates and increased over time within patients, culminating in 40% of patients having daptomycin-nonsusceptible isolates in the final year of the study. Infect Control Hosp Epidemiol 2018;1-3.
January 14, 2018: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29329389/in-vivo-daptomycin-efficacy-against-experimental-vancomycin-resistant-enterococcus-faecium-endocarditis
#6
Sophie Reissier, Azzam Saleh-Mghir, François Guerin, Laurent Massias, Idir Ghout, Clara Sinel, Vincent Cattoir, Anne-Claude Cremieux
Objectives: Daptomycin has become a first-line therapeutic option for vancomycin-resistant Enterococcus faecium infective endocarditis (IE). Although high doses (≥8 mg/kg) are often recommended, optimal doses, particularly for strains with MICs close to the susceptibility breakpoint (4 mg/L), are still debated. Methods: Daptomycin efficacy at doses equivalent to 8 mg/kg daptomycin (DAP8) and 12 mg/kg daptomycin (DAP12) in humans was evaluated in a rabbit model of aortic valve IE induced by 108 cfu of E...
January 9, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29295973/protein-inspired-antibiotics-active-against-vancomycin-and-daptomycin-resistant-bacteria
#7
Mark A T Blaskovich, Karl A Hansford, Yujing Gong, Mark S Butler, Craig Muldoon, Johnny X Huang, Soumya Ramu, Alberto B Silva, Mu Cheng, Angela M Kavanagh, Zyta Ziora, Rajaratnam Premraj, Fredrik Lindahl, Tanya A Bradford, June C Lee, Tomislav Karoli, Ruby Pelingon, David J Edwards, Maite Amado, Alysha G Elliott, Wanida Phetsang, Noor Huda Daud, Johan E Deecke, Hanna E Sidjabat, Sefetogi Ramaologa, Johannes Zuegg, Jason R Betley, Andrew P G Beevers, Richard A G Smith, Jason A Roberts, David L Paterson, Matthew A Cooper
The public health threat posed by a looming 'post-antibiotic' era necessitates new approaches to antibiotic discovery. Drug development has typically avoided exploitation of membrane-binding properties, in contrast to nature's control of biological pathways via modulation of membrane-associated proteins and membrane lipid composition. Here, we describe the rejuvenation of the glycopeptide antibiotic vancomycin via selective targeting of bacterial membranes. Peptide libraries based on positively charged electrostatic effector sequences are ligated to N-terminal lipophilic membrane-insertive elements and then conjugated to vancomycin...
January 2, 2018: Nature Communications
https://www.readbyqxmd.com/read/29290374/physical-compatibility-of-meropenem-and-vaborbactam-with-select-intravenous-drugs-during-simulated-y-site-administration
#8
James M Kidd, Lindsay M Avery, Tomefa E Asempa, David P Nicolau, Joseph L Kuti
PURPOSE: Meropenem/vaborbactam is a novel intravenous antibiotic combining the carbapenem, meropenem, with a novel β-lactamase inhibitor, vaborbactam. Meropenem/vaborbactam is administered as a 3-hour infusion given every 8 hours, thereby potentially restricting an intravenous line for 9 h/d. Intravenous medications may be given concurrently via Y-site when compatibility data are available. Herein, physical compatibility was determined for the identification which medications can be coadministered with meropenem/vaborbactam via Y-site...
December 28, 2017: Clinical Therapeutics
https://www.readbyqxmd.com/read/29288438/synthetic-biology-genome-mining-and-combinatorial-biosynthesis-of-nrps-derived-antibiotics-a-perspective
#9
Richard H Baltz
Combinatorial biosynthesis of novel secondary metabolites derived from nonribosomal peptide synthetases (NRPSs) has been in slow development for about a quarter of a century. Progress has been hampered by the complexity of the giant multimodular multienzymes. More recently, advances have been made on understanding the chemical and structural biology of these complex megaenzymes, and on learning the design rules for engineering functional hybrid enzymes. In this perspective, I address what has been learned about successful engineering of complex lipopeptides related to daptomycin, and discuss how synthetic biology and microbial genome mining can converge to broaden the scope and enhance the speed and robustness of combinatorial biosynthesis of NRPS-derived natural products for drug discovery...
December 29, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/29287806/antibiotic-susceptibility-of-259-listeria-monocytogenes-strains-isolated-from-food-food-processing-plants-and-human-samples-in-germany
#10
Matthias Noll, Sylvia Kleta, Sascha Al Dahouk
BACKGROUND: The objective of this study was to evaluate the susceptibility of 259 Listeria monocytogenes strains isolated from food and food-processing environments and patient samples in Germany to 14 antibiotics widely used in veterinary and human medicine. L. monocytogenes strains were isolated mainly from milk and milk products and classified according to their molecular serotypes IIa (n=112), IIb (n=41), IIc (n=36), IVa (n=1), IVb (n=66), and IVb-v1 (n=3). METHODS: Susceptibility tests were performed by using the automated 96-well based microdilution system Micronaut-S...
December 26, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/29277526/dalbavancin-in-vitro-activity-obtained-against-gram-positive-clinical-isolates-causing-bone-and-joint-infections-in-united-states-and-european-hospitals-2011-2016
#11
Michael A Pfaller, Robert K Flamm, Mariana Castanheira, Helio S Sader, Rodrigo E Mendes
BACKGROUND: Osteomyelitis represents hard-to-treat infections that regularly involve prolonged systemic antibiotic use. Dalbavancin has demonstrated activity against gram-positive isolates and has been considered as a candidate for osteomyelitis therapy in adults and children. This study evaluates the activity of dalbavancin against pathogens isolated from bone and joint infections (BJI). METHODS: 801 S. aureus, 160 coagulase-negative staphylococci (CoNS), 164 β-haemolytic streptococci (BHS), 82 E...
December 22, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29273611/physical-compatibility-of-fosfomycin-for-injection-with-select-i-v-drugs-during-simulated-y-site-administration
#12
Marguerite L Monogue, Safa S Almarzoky Abuhussain, Joseph L Kuti, David P Nicolau
PURPOSE: The results of a study to determine the physical compatibility of ZTI-01 (fosfomycin for injection) in 0.9% sodium chloride or 5% dextrose during simulated Y-site administration with 37 i.v. antimicrobials and 58 nonantimicrobials are reported. METHODS: Fosfomycin, an epoxide antibiotic with broad-spectrum activity against multidrug-resistant bacteria, is marketed in the United States only in an oral formulation with limited bioavailability, but an i.v...
January 1, 2018: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/29273542/valorization-of-a-pharmaceutical-organic-sludge-through-different-composting-treatments
#13
Mirko Cucina, Chiara Tacconi, Simone Sordi, Daniela Pezzolla, Giovanni Gigliotti, Claudia Zadra
Nowadays, the agricultural reuse of pharmaceutical sludge is still limited due to environmental and agronomic issues (e.g. low stabilization of the organic matter, phytotoxicity). The aim of the present study was to evaluate the characteristics of a pharmaceutical sludge derived from the daptomycin production and to study the possibility of improving its quality through composting. The pharmaceutical sludge showed high content of macronutrients (e.g. total Kjeldahl N content was 38 g kg-1), but it was also characterized by high salinity (7...
December 19, 2017: Waste Management
https://www.readbyqxmd.com/read/29259579/daptomycin-resistance-in-clinical-mrsa-strains-is-associated-with-a-high-biological-fitness-cost
#14
Melanie Roch, Paula Gagetti, James Davis, Paola Ceriana, Laura Errecalde, Alejandra Corso, Adriana E Rosato
Daptomycin remains as one of the main treatment options for Methicillin-Resistant Staphylococcus aureus (MRSA). Sporadic resistance cases reported in patients treated with either daptomycin or glycopeptides are a growing concern. In a previous study, we described a clinical case of a patient with a community-acquired MRSA infection resistant to daptomycin and with intermediate resistance to vancomycin who developed a recurrent infection with a susceptible isogenic strain. In the present work, we further investigated the sequential events to determine whether the switch from a daptomycin resistance to a susceptible phenotype was due to a phenomenon of resistance reversion or recurrent infection with a susceptible strain...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29242835/characterization-of-the-mechanisms-of-daptomycin-resistance-among-gram-positive-bacterial-pathogens-by-multidimensional-lipidomics
#15
Kelly M Hines, Adam Waalkes, Kelsi Penewit, Elizabeth A Holmes, Stephen J Salipante, Brian J Werth, Libin Xu
Previous work suggests that altered lipid metabolism may be associated with daptomycin resistance in Gram-positive pathogens, but lipidomic changes underlying resistance are not fully understood. We performed untargeted lipidomics by using three-dimensional hydrophilic interaction liquid chromatography-ion mobility-mass spectrometry (HILIC-IM-MS) to characterize alterations in the lipidomes of daptomycin-susceptible and -resistant isogenic strain pairs of Enterococcus faecalis, Staphylococcus aureus, and Corynebacterium striatum...
November 2017: MSphere
https://www.readbyqxmd.com/read/29242142/use-of-a-penicillin-allergy-screening-algorithm-and-penicillin-skin-testing-for-transitioning-hospitalized-patients-to-first-line-antibiotic-therapy
#16
Allison Ramsey, Mary L Staicu
BACKGROUND: Penicillin allergy is the most commonly reported antibiotic allergy. Avoidance of β-lactam antibiotics in hospitalized patients leads to the use of second-line therapies. OBJECTIVE: The utility of a penicillin allergy history algorithm (PAHA) and subsequent penicillin skin testing (PST) in transitioning hospitalized patients from second- to first-line antibiotic therapy is described. METHODS: Through an electronic medical record report, pharmacists identified adult inpatients with penicillin allergy receiving moxifloxacin, intravenous vancomycin, aztreonam, daptomycin, or linezolid, in which a β-lactam antibiotic was preferred...
December 11, 2017: Journal of Allergy and Clinical Immunology in Practice
https://www.readbyqxmd.com/read/29237024/comparative-analysis-of-neutropenia-in-patients-receiving-prolonged-treatment-with-ceftaroline
#17
R Brigg Turner, D Erin Wilson, Henry Saedi-Kwon, Eric Chang, Regina Won, Dominic Chan, Jacqueline Schwartz
Objectives: Ceftaroline is often used in durations greater than that studied in clinical trials. Several retrospective, non-comparative studies have suggested a higher than anticipated incidence of neutropenia in patients receiving prolonged treatment with ceftaroline. We sought to determine if ceftaroline was associated with neutropenia by comparing the incidence with ceftaroline treatment with treatment with several comparative antibiotics. Methods: Patients receiving 14 or more consecutive days of treatment with ceftaroline were compared with patients receiving cefazolin, daptomycin, linezolid, nafcillin or vancomycin (control group)...
December 8, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29235661/association-of-higher-daptomycin-dose-%C3%A2-7-mg-kg-with-improved-survival-in-patients-with-methicillin-resistant-staphylococcus-aureus-bacteremia
#18
Tristan T Timbrook, Aisling R Caffrey, Megan K Luther, Vrishali Lopes, Kerry L LaPlante
STUDY OBJECTIVE: Current guidelines recommend higher daptomycin doses than the daptomycin label dose of 6 mg/kg for methicillin-resistant Staphylococcus aureus (MRSA) bacteremia; however, the evidence supporting this recommendation is from in vitro and cases series studies. The objective of this study was to evaluate the comparative effectiveness of the daptomycin label dose versus higher daptomycin doses in patients with MRSA bacteremia. DESIGN: Retrospective national cohort study...
December 13, 2017: Pharmacotherapy
https://www.readbyqxmd.com/read/29225987/daptomycin-induced-acute-eosinophilic-pneumonia-late-onset-and-quick-recovery
#19
Mohamad Rachid, Khansa Ahmad, Meghan Saunders-Kurban, Aelia Fatima, Aditya Shah, Anas Nahhas
Background: Daptomycin is a cyclic lipopeptide antibiotic that provides great coverage for gram positive cocci. From the early years of daptomycin use, concerns were raised regarding the pulmonary side effects of daptomycin and potential development of acute eosinophilic pneumonia (AEP) secondary to daptomycin therapy. Discussion: AEP could be idiopathic or induced by drugs or toxins. It is a distinct entity from atopic diseases and autoimmune, parasitic, or fungal infections that can also cause pulmonary eosinophilia...
2017: Case Reports in Pulmonology
https://www.readbyqxmd.com/read/29222405/multiple-weekly-dalbavancin-dosing-for-the-treatment-of-native-vertebral-osteomyelitis-caused-by-methicillin-resistant-staphylococcus-aureus-a-case-report
#20
Thamer A Almangour, Valerie Fletcher, Mohammed Alessa, Abdullah A Alhifany, Deanne Tabb
BACKGROUND Native vertebral osteomyelitis (NVO) is a common form of hematogenous osteomyelitis, with Staphylococcus aureus (S. aureus) being the most commonly isolated organism. Dalbavancin is approved by the US Food and Drug Administration (FDA) for the treatment of acute bacterial skin and skin structure infections (ABSSSI) and has a sufficiently promising pharmacokinetic and pharmacodynamic profile to be considered for the treatment of vertebral osteomyelitis. We describe here what is probably the first reported case of using multiple weekly dalbavancin to treat a complicated methicillin-resistant Staphylococcus aureus (MRSA) bacteremia and vertebral osteomyelitis...
December 9, 2017: American Journal of Case Reports
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