keyword
MENU ▼
Read by QxMD icon Read
search

Polymyxin resistant

keyword
https://www.readbyqxmd.com/read/28716359/predictors-of-polymyxin-b-treatment-failure-in-gram-negative-healthcare-associated-infections-among-critically-ill-patients
#1
Bahiah Ismail, Mohd Nazri Shafei, Azian Harun, Saedah Ali, Mahamarowi Omar, Zakuan Zainy Deris
BACKGROUND: With increasing prevalence and spread of multidrug resistant Gram-negative infections, parenteral polymyxins resurged in clinical practice. The primary aim of the study was to determine the predictors of treatment failure and in-hospital mortality among critically ill patients treated with polymyxin B. METHODS: Demographic data, underlying diseases, procedures and details on polymyxin B therapy were retrospectively analyzed in a cohort of 84 patients who received intravenous polymyxin B in an intensive care unit from 2010 to 2014...
June 29, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28713357/extensively-drug-resistant-klebsiella-pneumoniae-causing-nosocomial-bloodstream-infections-in-china-molecular-investigation-of-antibiotic-resistance-determinants-informing-therapy-and-clinical-outcomes
#2
Wenzi Bi, Haiyang Liu, Rhys A Dunstan, Bin Li, Von Vergel L Torres, Jianming Cao, Lijiang Chen, Jonathan J Wilksch, Richard A Strugnell, Trevor Lithgow, Tieli Zhou
The rise in diversity of antimicrobial resistance phenotypes seen in Klebsiella pneumoniae is becoming a serious antibiotic management problem. We sought to investigate the molecular characteristics and clinical implications of extensively drug-resistant (XDR) K. pneumoniae isolated from different nosocomial bloodstream infections (BSIs) patients from July 2013 to November 2015. Even in combination treatment, meropenem did not protect against mortality of BSIs patients (P = 0.015). In contrast, tigecycline in combination with other antimicrobial agents significantly protected against mortality (P = 0...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28711508/virulent-and-pathogenic-features-on-the-cronobacter-sakazakii-polymyxin-resistant-pmr-mutant-strain-s-3
#3
Xuerui Bao, Ling Yang, Lequn Chen, Bing Li, Lin Li, Yanyan Li, Zhenbo Xu
Cronobacter sakazakii is a well-known opportunistic pathogen responsible for necrotizing enterocolitis, meningitis and septicaemia in the premature, immunocompromised infants and neonates. This pathogen possesses various virulence factors and regulatory systems, and pmrA/pmrB regulatory system has been identified in a variety of bacterial species. The current study aims to investigate role of pmrA gene in the pathogenicity and virulence characteristics of Cronobacter sakazakii using whole genome sequencing and RNA-seq...
July 12, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28700048/distribution-of-the-bla-oxa-bla-veb-1-and-bla-ges-1-genes-and-resistance-patterns-of-esbl-producing-pseudomonas-aeruginosa-isolated-from-hospitals-in-tehran-and-qazvin-iran
#4
Sahar Amirkamali, Taghi Naserpour-Farivar, Khadijeh Azarhoosh, Amir Peymani
INTRODUCTION: Pseudomonas aeruginosa is one of the most common nosocomial pathogens. The emergence of extended spectrum β-lactamases (ESBLs) has been increasingly reported as a major clinical concern worldwide. The main aim of the present study was to determine the distribution of bla OXA, bla PER-1, bla VEB-1, and bla GES-1 genes among ESBL-producing P. aeruginosa isolated from two distinct provinces in Iran. METHODS: In this study, a total of 75 (27.5%) ESBL-producing isolates were identified from 273 P...
May 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28696672/magnetic-extraction-of-acinetobacter-baumannii-using-colistin-functionalized-%C3%AE-fe2o3-au-core-shell-composite-nanoclusters
#5
Charleson S Bell, Raquel Mejias, Sinead Miller, Jasmine Greer, Mark McClain, Timothy L Cover, Todd D Giorgio
Acinetobacter baumannii is a gram-negative bacterium of increasing concern due to its virulence and persistence in combat and healthcare environments. The incidence of both community-acquired and nosocomial A. baumannii infections is on the rise in foreign and domestic healthcare facilities. Treatment options are limited due to the acquisition of multi-drug resistance to the few effective antibiotics. Currently, the most effective pharmaceutically-based treatment for multi-drug-resistant A. baumannii infections is the antibiotic colistin (polymyxin E)...
July 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28695731/investigating-the-interaction-of-octapeptin-a3-with-model-bacterial-membranes
#6
Mei-Ling Han, Hsin-Hui Shen, Karl A Hansford, Elena K Schneider, Sivashangarie Sivanesan, Kade D Roberts, Philip E Thompson, Anton P Le Brun, Yan Zhu, Marc-Antoine Sani, Frances Separovic, Mark A T Blaskovich, Mark A Baker, Samuel M Moskowitz, Matthew A Cooper, Jian Li, Tony Velkov
Octapeptins are cyclic lipopeptides with a broader spectrum of activity against fungi and polymyxin-resistant Gram-negative and Gram-positive bacteria. In the present study, we investigated the interaction of octapeptin A3 with asymmetric outer membrane models of Gram-negative pathogen Pseudomonas aeruginosa using neutron reflectometry, together with fluorimetric and calorimetry methods. For the first time, our neutron reflectometry results reveal that the interaction of octapeptin A3 with the Gram-negative outer membrane involves an initial transient polar interaction with the phospholipid and lipid A headgroups, followed by the penetration of the entire octapeptin molecule into the fatty acyl core of the outer membrane...
July 11, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28693659/what-s-lurking-around-the-corner-polymyxin-b-resistance-among-klebsiella-pnemoniae-carbapenemase-producing-enterobacteriaceae-and-others-as-a-burden-of-use
#7
Leandro Reus Rodrigues Perez
No abstract text is available yet for this article.
July 11, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/28692823/high-hiv-infection-prevalence-in-a-group-of-men-who-have-sex-with-men-msm
#8
Raquel Maria Cardoso Torres, Marly Marques da Cruz, André Reynaldo Santos Périssé, Denise Ribeiro Franqueira Pires
OBJECTIVE: To evaluate, by phenotypic and genotypic parameters, the presence of virulence and resistance factors in clinical Acinetobacter baumannii strains and verify the correlation between these variables. SETTINGS: Observational study conducted in an Universitary Hospital in Belo Horizonte, Brazil. METHODS: The confirmation of A. baumannii-calcoaceticus complex was performed by blaOXA51 detection, through the polymerase chain reaction (PCR) multiplex, as well as to investigate the presence of other oxacillinases (blaOXA23, 24, 58)...
July 7, 2017: Brazilian Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28683827/expanding-landscapes-of-the-diversified-mcr-1-bearing-plasmid-reservoirs
#9
Qingjing Wang, Jian Sun, Jun Li, Youfa Ding, Xing-Ping Li, Jingxia Lin, Bachar Hassan, Youjun Feng
BACKGROUND: Polymyxin is a cationic polypeptide antibiotic that can disrupt bacterial cell membrane by interacting with its lipopolysaccharide molecules and is used as a last resort drug against lethal infections by the carbapenem-resistant superbugs (like NDM-1). However, global discovery of the MCR-1 colistin resistance dramatically challenges the newly renewed interest in colistin for clinical use. METHODS: The mcr-1-harboring plasmids were acquired from swine and human Escherichia coli isolated in China, from 2015 to 2016, and subjected to Illumina PacBio RSII and Hi-Seq2000 for full genome sequencing...
July 6, 2017: Microbiome
https://www.readbyqxmd.com/read/28678874/molecular-characteristics-of-mcr-1-carrying-plasmids-and-new-mcr-1-variant-recovered-from-polyclonal-clinical-escherichia-coli-from-argentina-and-canada
#10
Nathalie Tijet, Diego Faccone, Melina Rapoport, Christine Seah, Fernando Pasterán, Paola Ceriana, Ezequiel Albornoz, Alejandra Corso, Alejandro Petroni, Roberto G Melano
We have characterized nine mcr-1-harboring plasmids from clinical Escherichia coli isolates previously described in Argentina and Canada. Three of these plasmids carried a mcr-1-variant called here mcr-1.5. All these E. coli isolates were not clonally related and were recovered in different years and locations. However, their mcr-1-harboring plasmids showed high identity among them and to others characterized in other countries, which strongly suggests that this plasmid-type is playing an important role in spreading this mechanism of resistance to polymyxins...
2017: PloS One
https://www.readbyqxmd.com/read/28671519/acinetobacter-colistiniresistens-sp-nov-formerly-genomic-species-13-sensu-bouvet-and-jeanjean-and-genomic-species-14-sensu-tjernberg-and-ursing-isolated-from-human-infections-and-characterized-by-intrinsic-resistance-to-polymyxins
#11
Alexandr Nemec, Lenka Radolfova-Krizova, Martina Maixnerova, Ondrej Sedo
Strains of the genusAcinetobacter, classified as genomic species 13BJ/14TU have been previously associated with human infections and resistance to colistin. To clarify the taxonomy of this provisional group, we investigated 24 strains that have been isolated from humans since the 1960s in 10 countries. The genus-wide analysis of the rpoB and gyrB sequences of all strains and whole-genome sequences of strains representing different rpoB/gyrB genotypes showed that the 24 strains formed a distinct monophyletic group within the so-called haemolytic clade of the genus Acinetobacter...
July 3, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28668691/colistin-resistance-gene-mcr-1-in-children-s-gut-flora
#12
Yan-Yan Hu, Yue-Ling Wang, Qiao-Ling Sun, Zi-Xian Huang, Han-Yu Wang, Rong Zhang, Gong-Xiang Chen
The aim of this study was to clarify the prevalence and transmission mechanism(s) of mcr-1 in children's gut flora. Fecal samples (n=173) were obtained from non-diarrhea patients at the Children's Hospital of Zhejiang University. Polymerase chain reaction-based analysis indicated that 17 isolates from 9.8% of the samples were positive for mcr-1; these comprised 16 E. coli isolates and one C. freundii. Nine mcr-1-bearing isolates co-expressed extended-spectrum beta-lactamase genes but plasmid-mediated quinolone resistance genes were not detected...
June 28, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28655818/novel-plasmid-mediated-colistin-resistance-gene-mcr-3-in-escherichia-coli
#13
Wenjuan Yin, Hui Li, Yingbo Shen, Zhihai Liu, Shaolin Wang, Zhangqi Shen, Rong Zhang, Timothy R Walsh, Jianzhong Shen, Yang Wang
The mobile colistin resistance gene mcr-1 has attracted global attention, as it heralds the breach of polymyxins, one of the last-resort antibiotics for the treatment of severe clinical infections caused by multidrug-resistant Gram-negative bacteria. To date, six slightly different variants of mcr-1, and a second mobile colistin resistance gene, mcr-2, have been reported or annotated in the GenBank database. Here, we characterized a third mobile colistin resistance gene, mcr-3 The gene coexisted with 18 additional resistance determinants in the 261-kb IncHI2-type plasmid pWJ1 from porcine Escherichia colimcr-3 showed 45...
June 27, 2017: MBio
https://www.readbyqxmd.com/read/28652313/identification-and-characterization-of-klebsiella-pneumoniae-two-lpxl-lipid-a-late-acyltransferases-and-their-role-in-virulence
#14
Grant Mills, Amy Dumigan, Timothy Kidd, Laura Hobley, José A Bengoechea
Klebsiella pneumoniae causes a wide range of infections, from urinary tract infections to pneumonia. The lipopolysaccharide is a virulence factor of this pathogen, although there are gaps in our understanding of its biosynthesis. Here we report the characterization of K. pneumoniae LpxL which encodes one of the enzymes responsible for late secondary acylation of immature lipid A molecules. Analysis of the available K. pneumoniae genomes revealed that this pathogen encodes two orthologues of Escherichia coli LpxL...
June 26, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28636788/role-of-positively-charged-residues-on-the-polar-and-non-polar-faces-of-amphipathic-%C3%AE-helical-antimicrobial-peptides-amps-on-specificity-and-selectivity-for-gram-negative-pathogens
#15
Ziqing Jiang, Colin T Mant, Michael Vasil, Robert S Hodges
We have designed de novo and synthesized eight 26-residue all D-conformation amphipathic α-helical cationic antimicrobial peptides (AMPs), four with "specificity determinants" which provide specificity for prokaryotic cells over eukaryotic cells and four AMPs without specificity determinants. The eight AMPs contain six positively charged Lys residues on the polar face in four different arrangements to understand the role of these residues have on antimicrobial activity against 14 Acinetobacter baumannii strains, 7 of which were resistant to polymyxin B and colistin; 6 diverse Pseudomonas aeruginosa strains and 17 Staphylococcus aureus strains, 9 of which were Methicillin-sensitive (MSSA) and 8 of which were Methicillin-resistant (MRSA)...
June 21, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28628170/recent-advances-and-perspectives-in-the-design-and-development-of-polymyxins
#16
REVIEW
Francesc Rabanal, Yolanda Cajal
Covering: 1947-early 2017, particularly from 2005-early 2017The rise of bacterial pathogens with acquired resistance to almost all available antibiotics is becoming a serious public health issue. Polymyxins, antibiotics that were mostly abandoned a few decades ago because of toxicity concerns, are ultimately considered as a last-line therapy to treat infections caused by multi-drug resistant Gram-negative bacteria. This review surveys the progress in understanding polymyxin structure, and their chemistry, mechanisms of antibacterial activity and nephrotoxicity, biomarkers, synergy and combination with other antimicrobial agents and antibiofilm properties...
June 19, 2017: Natural Product Reports
https://www.readbyqxmd.com/read/28616507/the-first-report-of-escherichia-fergusonii-isolated-from-non-human-primates-in-africa
#17
Barbara Glover, Jeanette Wentzel, Akinbowale Jenkins, Moritz Van Vuuren
The aim of this study was to determine the resistance phenotypes of selected enteric bacteria isolated from non-human primates at a wildlife-human interface. Bacterial isolates from faecal samples of non-human primates at two wildlife rehabilitation centres in South Africa were screened for the presence of Escherichia coli. The biochemical characterisation of E. coli and E. coli-like bacteria revealed both adonitol positive and sorbitol negative strains - a unique characteristic of Escherichia fergusonii and Escherichia coli K99...
June 2017: One Health
https://www.readbyqxmd.com/read/28615078/characterisation-of-roseomonas-mucosa-isolated-from-the-root-canal-of-an-infected-tooth
#18
Nina Diesendorf, Stefanie Köhler, Walter Geißdörfer, Tanja Grobecker-Karl, Matthias Karl, Andreas Burkovski
OBJECTIVE: The genus Roseomonas comprises a group of pink-pigmented, slow-growing, aerobic, non-fermentative Gram-negative bacteria, which have been isolated from environmental sources such as water and soil, but are also associated with human infections. In the study presented here, Roseomonas mucosa was identified for the first time as part of the endodontic microbiota of an infected root canal and characterised in respect to growth, antibiotic susceptibility and biofilm formation. RESULTS: The isolated R...
June 14, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28606644/comparison-of-methods-for-detection-of-plasmid-mediated-and-chromosomally-encoded-colistin-resistance-in-enterobacteriaceae
#19
Aurélie Jayol, Patrice Nordmann, Philippe Lehours, Laurent Poirel, Véronique Dubois
OBJECTIVES: Because of the emergence of plasmid-mediated (mcr-1 and mcr-2 genes) and chromosomally-encoded colistin resistance, reliable methods for detecting colistin resistance/susceptibility in routine laboratories are required. We evaluated the respective performances of the BD Phoenix automated system, the newly-developed Rapid Polymyxin NP test and the broth microdilution (BMD) reference method to detect colistin resistance in Enterobacteriaceae, and particularly those producing MCR-1 and MCR-2...
June 9, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28605374/laboratory-techniques-used-to-maintain-and-differentiate-biotypes-of-vibrio-cholerae-clinical-and-environmental-isolates
#20
Kyle D Brumfield, Bailey M Carignan, Jordan N Ray, Panagiota E Jumpre, Mike S Son
The aquatic Gram-negative bacterium Vibrio cholerae is the etiological agent of the infectious gastrointestinal disease cholera. Due to the global prevalence and severity of this disease, V. cholerae has been extensively studied in both environmental and laboratory settings, requiring proper maintenance and culturing techniques. Classical and El Tor are two main biotypes that compose the V. cholerae O1 serogroup, each displaying unique genotypic and phenotypic characteristics that provide reliable mechanisms for biotype characterization, and require distinct virulence inducing culturing conditions...
May 30, 2017: Journal of Visualized Experiments: JoVE
keyword
keyword
93868
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"