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https://www.readbyqxmd.com/read/29151282/epidemiology-and-impact-of-bloodstream-infections-among-kidney-transplant-recipients-a-retrospective-single-center-experience
#1
Ali M Shendi, Gabriel Wallis, Helena Painter, Mark Harber, Sophie Collier
BACKGROUND: Bloodstream infections (BSI) represent an important source of morbidity and mortality, as well as an increasing therapeutic challenge, among solid organ transplant recipients. Understanding the epidemiological and microbiological characteristics of BSI following renal transplantation is paramount to the implementation of appropriate preventative and therapeutic measures. METHODS: We conducted a retrospective review of all BSI episodes occurring between July 2009 and April 2016 in adult patients, who received a renal transplant at Royal Free London hospital...
November 19, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/29149329/polymyxin-derivatives-nab739-and-nab815-are-more-effective-than-polymyxin-b-in-murine-escherichia-coli-pyelonephritis
#2
Martti Vaara, Timo Vaara, Carina Vingsbo Lundberg
Objectives: Extremely multiresistant strains of Enterobacteriaceae, such as those of Escherichia coli and Klebsiella pneumoniae, are emerging and spreading at a worrisome speed. Polymyxins (polymyxin B, colistin) are used as last-line therapy against such strains, in spite of their notable nephrotoxicity that may even require discontinuation of the therapy. We have previously developed polymyxin derivatives NAB739 and NAB815 that are better tolerated in cynomolgus monkeys than polymyxin B and are, in contrast to polymyxin B, excreted in the cynomolgus urine to a very significant degree...
November 14, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29149302/activity-of-colistin-alone-or-in-combination-with-rifampicin-or-meropenem-in-a-carbapenem-resistant-bioluminescent-pseudomonas-aeruginosa-intraperitoneal-murine-infection-model
#3
Yun Cai, Deqing Yang, Jin Wang, Rui Wang
Background: Carbapenem-resistant Pseudomonas aeruginosa (CRPA) infections represent a major therapeutic problem and combination therapy may be the chemotherapeutic option. Methods: Bioluminescent CRPA was developed through sequential subcultures in subinhibitory concentrations of meropenem from an engineered strain of bioluminescent PA Xen5. Then CRPA was injected intraperitoneally to establish an intraperitoneal murine infection model. Treatments of colistin alone or combined with rifampicin or meropenem were started 1 h after infection...
November 14, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29149294/pharmacokinetics-pharmacodynamics-of-systemically-administered-polymyxin-b-against-klebsiella-pneumoniae-in-mouse-thigh-and-lung-infection-models
#4
Cornelia B Landersdorfer, Jiping Wang, Veronika Wirth, Ke Chen, Keith S Kaye, Brian T Tsuji, Jian Li, Roger L Nation
Background: The pharmacokinetic/pharmacodynamic (PK/PD) relationship for polymyxin B against Klebsiella pneumoniae infections is not known. Methods: Dose-fractionation studies with subcutaneous polymyxin B were conducted in neutropenic mice in which infection with three strains of K. pneumoniae had been produced in thighs or lungs. Dosing (thigh infection 0.5-120 mg/kg/day; lung infection 5-120 mg/kg/day) commenced 2 h after inoculation, and bacterial burden was measured 24 h later...
November 14, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29148380/high-rate-of-mcr-1-producing-escherichia-coli-and-klebsiella-pneumoniae-among-pigs-portugal
#5
Nicolas Kieffer, Marta Aires-de-Sousa, Patrice Nordmann, Laurent Poirel
The mcr-1 (mobile colistin resistance 1) gene, which encodes phosphoethanolamine transferase, has been recently identified as a source of acquired resistance to polymyxins in Escherichia coli. Using the SuperPolymyxin selective medium, we prospectively screened 100 pigs at 2 farms in Portugal for polymyxin-resistant Enterobacteriaceae and recovered 98 plasmid-mediated MCR-1-producing isolates. Most isolates corresponded to nonclonally related E. coli belonging to many sequence types; we also found 2 Klebsiella pneumoniae sequence types...
December 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29147117/colistin-resistance-of-pseudomonas-aeruginosa-isolated-from-snakes-in-taiwan
#6
Po-Yu Liu, Ling-Ling Weng, Shu-Ying Tseng, Chou-Chen Huang, Ching-Chang Cheng, Yan-Chiao Mao, Kwong-Chung Tung
This study included fifty-eight isolates of P. aeruginosa from the oral cavity of snakes that were recruited from clinical cases, captive and wild snakes. The minimum inhibitory concentrations (MICs) for the determination of susceptibility were identified by the broth microdilution method. Polymerase chain reaction (PCR) was employed to detect β-lactamases genes. With regard to antipseudomonal antibiotics, the lowest nonsusceptible rates were in aztreonam (15%), piperacillin/tazobactam (12%), and amikacin (9%)...
2017: Canadian Journal of Infectious Diseases & Medical Microbiology
https://www.readbyqxmd.com/read/29146264/combination-of-amplified-rdna-restriction-analysis-and-high-throughput-sequencing-revealed-the-negative-effect-of-colistin-sulfate-on-the-diversity-of-soil-microorganisms
#7
Tingli Fan, Yongxue Sun, Jinju Peng, Qun Wu, Yi Ma, Xiaohui Zhou
Colistin sulfate is widely used in both human and veterinary medicine. However, its effect on the microbial ecologyis unknown. In this study, we determined the effect of colistin sulfate on the diversity of soil microorganisms by amplified rDNA restriction analysis (ARDRA) and high-throughput sequencing.ARDRAshowed that the diversity of DNA from soil microorganisms was reduced after soil was treated with colistin sulfate, with the most dramatic reductionobserved after 35days of treatment. High-throughput sequencing showed that the Chao1 and abundance-based coverage estimators (ACE) were reduced in the soils treated with colistin sulfate for 35 dayscompared to those treated with colistin sulfate for 7days...
January 2018: Microbiological Research
https://www.readbyqxmd.com/read/29141051/molecular-and-epidemiological-characterization-of-carbapenemase-producing-enterobacteriaceae-in-norway-2007-to-2014
#8
Ørjan Samuelsen, Søren Overballe-Petersen, Jørgen Vildershøj Bjørnholt, Sylvain Brisse, Michel Doumith, Neil Woodford, Katie L Hopkins, Bettina Aasnæs, Bjørg Haldorsen, Arnfinn Sundsfjord
The prevalence of carbapenemase-producing Enterobacteriaceae (CPE) is increasing worldwide. Here we present associated patient data and molecular, epidemiological and phenotypic characteristics of all CPE isolates in Norway from 2007 to 2014 confirmed at the Norwegian National Advisory Unit on Detection of Antimicrobial Resistance. All confirmed CPE isolates were characterized pheno- and genotypically, including by whole genome sequencing (WGS). Patient data were reviewed retrospectively. In total 59 CPE isolates were identified from 53 patients...
2017: PloS One
https://www.readbyqxmd.com/read/29138303/cxc-chemokines-exhibit-bactericidal-activity-against-multidrug-resistant-gram-negative-pathogens
#9
Matthew A Crawford, Debra J Fisher, Lisa M Leung, Sara Lomonaco, Christine Lascols, Antonio Cannatelli, Tommaso Giani, Gian Maria Rossolini, Yohei Doi, David R Goodlett, Marc W Allard, Shashi K Sharma, Erum Khan, Robert K Ernst, Molly A Hughes
The continued rise and spread of antimicrobial resistance among bacterial pathogens pose a serious challenge to global health. Countering antimicrobial-resistant pathogens requires a multifaceted effort that includes the discovery of novel therapeutic approaches. Here, we establish the capacity of the human CXC chemokines CXCL9 and CXCL10 to kill multidrug-resistant Gram-negative bacteria, including New Delhi metallo-beta-lactamase-1-producing Klebsiella pneumoniae and colistin-resistant members of the family Enterobacteriaceae that harbor the mobile colistin resistance protein MCR-1 and thus possess phosphoethanolamine-modified lipid A...
November 14, 2017: MBio
https://www.readbyqxmd.com/read/29137129/design-and-evaluation-of-novel-polymyxin-fluorescent-probes
#10
Bo Yun, Kade D Roberts, Philip E Thompson, Roger L Nation, Tony Velkov, Jian Li
Polymyxins (polymyxin B and colistin) are cyclic lipopeptide antibiotics that serve as a last-line defence against Gram-negative "superbugs". In the present study, two novel fluorescent polymyxin probes were designed through regio-selective modifications of the polymyxin B core structure at the N-terminus and the hydrophobic motif at positions 6 and 7. The resulting probes, FADDI-285 and FADDI-286 demonstrated comparable antibacterial activity (MICs 2-8 mg/L) to polymyxin B and colistin (MICs 0.5-8 mg/L) against a panel of gram-negative clinical isolates of Acinetobacter baumannii, Klebsiella pneumoniae and Pseudomonas aeruginosa...
November 11, 2017: Sensors
https://www.readbyqxmd.com/read/29133565/emergence-of-chromosome-borne-colistin-resistance-gene-mcr-1-in-clinical-isolates-of-klebsiella-pneumoniae-from-india
#11
Sanjay Singh, Ashutosh Pathak, Awadhesh Kumar, Mohibur Rahman, Avinash Singh, Bruno G Zorn, Kashi N Prasad
Transmissible colistin resistance gene, mcr-1 has breached the one of the last line of defense for treatment of infections caused by carbapenem-resistant Enterobacteriaceae….
November 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29127051/genomic-analysis-of-in-vivo-acquired-resistance-to-colistin-and-rifampin-in-acinetobacter-baumannii
#12
Nadia Jaidane, Thierry Naas, Wejdene Mansour, Bechir Ben Radhia, Sofiene Jerbi, Noureddine Boujaafar, Olfa Bouallegue, Rémy A Bonnin
Acinetobacter baumannii is an opportunistic pathogen in health-care facilities responsible for nosocomial infections mostly in immune-compromised patients. Colistin resistance is increasingly reported worldwide in that species. We describe here in vivo selection of colistin and rifampin resistance in a carbapenem-resistant A. baumannii (Ab). Antimicrobial susceptibility testing, plasmid analysis, and Whole Genome Sequencing (WGS) were performed to fully characterize the resistome of AbS1 and AbS2 clinical isolates...
November 7, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29126221/identification-and-characterization-of-mcr-mediated-colistin-resistance-in-extraintestinal-escherichia-coli-from-poultry-and-livestock-in-china
#13
Afrah Kamal Yassin, Jilei Zhang, Jiawei Wang, Li Chen, Patrick Kelly, Patrick Butaye, Guangwu Lu, Jiansen Gong, Min Li, Lanjing Wei, Yaoyao Wang, Kezong Qi, Xiangan Han, Stuart Price, Terri Hathcock, Chengming Wang
Antimicrobial resistance to colistin has emerged worldwide threatening the efficacy of one of the last-resort antimicrobials used for the treatment of multidrug-resistant Enterobacteriaceae infection in humans. In this study, we investigated the presence of colistin resistance genes (mcr-1, mcr-2, mcr-3) in Escherichia coli strains isolated from poultry and livestock collected between 2004 and 2012 in China. Furthermore, we studied the maintenance and transfer of the mcr-1 gene in E. coli after serial passages...
November 8, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29121069/developing-selective-media-for-quantification-of-multispecies-biofilms-following-antibiotic-treatment
#14
Eva Vandeplassche, Tom Coenye, Aurélie Crabbé
The lungs of cystic fibrosis (CF) patients are chronically colonized by a polymicrobial biofilm community, leading to difficult-to-treat infections. To combat these infections, CF patients are commonly treated with a variety of antibiotics. Understanding the dynamics of polymicrobial community composition in response to antibiotic therapy is essential in the search for novel therapies. Culture-dependent quantification of individual bacteria from defined multispecies biofilms is frequently carried out by plating on selective media...
2017: PloS One
https://www.readbyqxmd.com/read/29120560/klebsiella-pneumoniae-oxa-48-in-a-urology-patient-case-report
#15
Ines Jajić, Ana Benčić, Marko Siroglavić, Gernot Zarfel, Boris Ružić, Ivan Pezelj, Branka Bedenić
We present an isolate of Klebsiella pneumoniae OXA-48 isolated in a 68-year-old man who underwent radical prostatectomy due to prostate cancer. The antibiotic susceptibility testing to a wide range of antibiotics was performed by disk diffusion method and determination of minimal inhibitory concentrations. The isolate was classified as multidrug-resistant. It showed intermediate susceptibility to imipenem and meropenem, resistance to ertapenem, and sensitivity only to colistin, amikacin, and trimethoprim-sulfamethoxazole...
March 2017: Acta Clinica Croatica
https://www.readbyqxmd.com/read/29119090/evaluation-of-antibiotic-usage-in-swine-reproduction-farms-in-umbria-region-based-on-the-quantitative-analysis-of-antimicrobial-consumption
#16
Fausto Scoppetta, Marco Sensi, Maria Pia Franciosini, Marinella Capuccella
Antibiotic use in food-producing animals has considerable impact on public health, especially with respect to the development and spread of antibiotic resistance. Pigs represent one of the main species in which antibiotics are frequently used for different purposes. Surveillance of antibiotic consumption and dose appropriateness, through novel approaches based on defined daily doses, is strongly needed to assess farms' antibiotic risk, in terms of spread of antibiotic resistance and possibile presence of residues in meat...
August 16, 2017: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/29118748/remarkable-diversity-of-escherichia-coli-carrying-mcr-1-from-hospital-sewage-with-the-identification-of-two-new-mcr-1-variants
#17
Feifei Zhao, Yu Feng, Xiaoju Lü, Alan McNally, Zhiyong Zong
The plasmid-borne colistin-resistant gene mcr-1 has rapidly become a worldwide public health concern. This study aims to determine the host bacterial strains, plasmids, and genetic contexts of mcr-1 in hospital sewage. A 1-ml hospital sewage sample was cultured. Colistin-resistant bacterial colonies were selected on agar plates and were subjected to whole genome sequencing and subsequent analysis. The transfer of mcr-1 between bacterial strains was tested using conjugation. New variants of mcr-1 were cloned to test the impact of variations on the function of mcr-1...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29117270/screening-for-the-presence-of-mcr-1-mcr-2-genes-in-shiga-toxin-producing-escherichia-coli-recovered-from-a-major-produce-production-region-in-california
#18
Daniela Mavrici, Jaszemyn C Yambao, Bertram G Lee, Beatriz Quiñones, Xiaohua He
The rapid spreading of polymyxin E (colistin) resistance among bacterial strains through the horizontally transmissible mcr-1 and mcr-2 plasmids has become a serious concern. The emergence of these genes in Shiga toxin-producing Escherichia coli (STEC), a group of human pathogenic bacteria was even more worrisome, urging us to investigate the prevalence of mcr genes among STEC isolates. A total of 1000 STEC isolates, recovered from livestock, wildlife, produce and other environmental sources in a major production region for leafy vegetables in California during 2006-2014, were screened by PCR for the presence of plasmid-borne mcr-1 and mcr-2...
2017: PloS One
https://www.readbyqxmd.com/read/29116586/correction-to-acquisition-of-tn6018-3-cs-regions-increases-colistin-mics-against-acinetobacter-baumannii-isolates-harboring-new-variants-of-abars
#19
Mohammad Savari, Alireza Ekrami, Saeed Shoja, Abbas Bahador
The published online version of this article contained a mistake. The correct affiliation of Alireza Ekrami should have been "Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran" . The authors regret this error.
November 7, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/29114023/mcr-1-inhibition-with-peptide-conjugated-phosphorodiamidate-morpholino-oligomers-restores-sensitivity-to-polymyxin-in-escherichia-coli
#20
Seth M Daly, Carolyn R Sturge, Christina F Felder-Scott, Bruce L Geller, David E Greenberg
In late 2015, the first example of a transferrable polymyxin resistance mechanism in Gram-negative pathogens, MCR-1, was reported. Since that report, MCR-1 has been described to occur in many Gram-negative pathogens, and the mechanism of MCR-1-mediated resistance was rapidly determined: an ethanolamine is attached to lipid A phosphate groups, rendering the membrane more electropositive and repelling positively charged polymyxins. Acquisition of MCR-1 is clinically significant because polymyxins are frequently last-line antibiotics used to treat extensively resistant organisms, so acquisition of this mechanism might lead to pan-resistant strains...
November 7, 2017: MBio
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