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Multidrug-resistant Organism

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https://www.readbyqxmd.com/read/28926596/bifurcation-kinetics-of-drug-uptake-by-gram-negative-bacteria
#1
David A Westfall, Ganesh Krishnamoorthy, David Wolloscheck, Rupa Sarkar, Helen I Zgurskaya, Valentin V Rybenkov
Cell envelopes of many bacteria consist of two membranes studded with efflux transporters. Such organization protects bacteria from the environment and gives rise to multidrug resistance. We report a kinetic model that accurately describes the permeation properties of this system. The model predicts complex non-linear patterns of drug uptake complete with a bifurcation, which recapitulate the known experimental anomalies. We introduce two kinetic parameters, the efflux and barrier constants, which replace those of Michaelis and Menten for trans-envelope transport...
2017: PloS One
https://www.readbyqxmd.com/read/28925528/relatedness-of-wildlife-and-livestock-avian-isolates-of-the-nosocomial-pathogen-acinetobacter-baumannii-to-lineages-spread-in-hospitals-worldwide
#2
Gottfried Wilharm, Evelyn Skiebe, Paul G Higgins, Marie T Poppel, Ulrike Blaschke, Sarah Leser, Christine Heider, Magdalena Heindorf, Paul Brauner, Udo Jäckel, Karin Böhland, Christiane Cuny, Andżelina Łopińska, Piotr Kaminski, Mariusz Kasprzak, Marcin Bochenski, Olaf Ciebiera, Marcin Tobółka, Katarzyna M Żołnierowicz, Joachim Siekiera, Harald Seifert, Stéphanie Gagné, Suzana P Salcedo, Michael Kaatz, Franziska Layer, Jennifer K Bender, Stephan Fuchs, Torsten Semmler, Yvonne Pfeifer, Leszek Jerzak
The natural habitats and potential reservoirs of the nosocomial pathogen Acinetobacter baumannii are poorly defined. Here, we put forth and tested the hypothesis of avian reservoirs of A. baumannii. We screened tracheal and rectal swab samples from livestock (chicken, geese) and wild birds (white stork nestlings) and isolated A. baumannii from 3% of sampled chicken (n=220), 8% of geese (n=40) and 25% of white stork nestlings (n=661). Virulence of selected avian A. baumannii isolates was comparable to that of clinical isolates in the Galleria mellonella infection model...
September 19, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28922838/comparative-genomics-of-a-drug-resistant-pseudomonas-aeruginosa-panel-and-the-challenges-of-antimicrobial-resistance-prediction-from-genomes
#3
J Jeukens, I Kukavica-Ibrulj, J G Emond-Rheault, L Freschi, R C Levesque
Antimicrobial resistance (AMR) is now recognized as a global threat to human health. The accessibility of microbial whole-genome sequencing offers an invaluable opportunity for resistance surveillance via the resistome, i.e. the genes and mutations underlying AMR. Unfortunately, AMR prediction from genomic data remains extremely challenging, especially for species with a large pan-genome. One such organism, for which multidrug-resistant (MDR) isolates are frequently encountered in the clinic, is Pseudomonas aeruginosa...
October 2, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28916900/were-all-carbapenemases-created-equal-treatment-of-ndm-producing-extensively-drug-resistant-enterobacteriaceae-a-case-report-and-literature-review
#4
REVIEW
Vindana Chibabhai, Trusha Nana, Norma Bosman, Teena Thomas, Warren Lowman
PURPOSE: There is currently a paucity of published literature focused on the treatment of infections caused by NDM-producing organisms. METHODS: We describe a case of a bacteraemia caused by an extensively drug-resistant (XDR) New Delhi metallo-β-lactamase (NDM)-producing Serratia marcescens and review the treatment options for XDR NDM-producing Enterobacteriaceae. RESULTS: Infections caused by New Delhi beta-lactamase (NDM)-producing Enterobacteriaceae are becoming increasingly prevalent worldwide...
September 15, 2017: Infection
https://www.readbyqxmd.com/read/28916385/bacterial-pneumonia-in-older-adults
#5
REVIEW
Oryan Henig, Keith S Kaye
The incidence of pneumonia increases with age, and is particularly high in patients who reside in long-term care facilities (LTCFs). Mortality rates for pneumonia in older adults are high and have not decreased in the last decade. Atypical symptoms and exacerbation of underlying illnesses should trigger clinical suspicion of pneumonia. Risk factors for multidrug-resistant organisms are more common in older adults, particularly among LTCF residents, and should be considered when making empiric treatment decisions...
September 12, 2017: Infectious Disease Clinics of North America
https://www.readbyqxmd.com/read/28906479/characterization-of-vb_saum-frusau02-a-twort-like-bacteriophage-isolated-from-a-therapeutic-phage-cocktail
#6
Katarzyna Leskinen, Henni Tuomala, Anu Wicklund, Jenni Horsma-Heikkinen, Pentti Kuusela, Mikael Skurnik, Saija Kiljunen
Staphylococcus aureus is a commensal and pathogenic bacterium that causes infections in humans and animals. It is a major cause of nosocomial infections worldwide. Due to increasing prevalence of multidrug resistance, alternative methods to eradicate the pathogen are necessary. In this respect, polyvalent staphylococcal myoviruses have been demonstrated to be excellent candidates for phage therapy. Here we present the characterization of the bacteriophage vB_SauM-fRuSau02 (fRuSau02) that was isolated from a commercial Staphylococcus bacteriophage cocktail produced by Microgen (Moscow, Russia)...
September 14, 2017: Viruses
https://www.readbyqxmd.com/read/28905529/who-treatment-guidelines-for-drug-resistant-tuberculosis-2016-update-applicability-in-south-korea
#7
REVIEW
Doosoo Jeon
Despite progress made in tuberculosis control worldwide, the disease burden and treatment outcome of multidrug-resistant tuberculosis (MDR-TB) patients have remained virtually unchanged. In 2016, the World Health Organization released new guidelines for the management of MDR-TB. The guidelines are intended to improve detection rate and treatment outcome for MDR-TB through novel, rapid molecular testing and shorter treatment regimens. Key changes include the introduction of a new, shorter MDR-TB treatment regimen, a new classification of medicines and updated recommendations for the conventional MDR-TB regimen...
September 1, 2017: Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/28900004/network-of-microbial-and-antibiotic-interactions-drive-colonization-and-infection-with-multidrug-resistant-organisms
#8
Joyce Wang, Betsy Foxman, Lona Mody, Evan S Snitkin
The emergence and spread of multidrug-resistant organisms (MDROs) across global healthcare networks poses a serious threat to hospitalized individuals. Strategies to limit the emergence and spread of MDROs include oversight to decrease selective pressure for MDROs by promoting appropriate antibiotic use via antibiotic stewardship programs. However, restricting the use of one antibiotic often requires a compensatory increase in the use of other antibiotics, which in turn selects for the emergence of different MDRO species...
September 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28899807/tn2008-driven-carbapenem-resistance-in-acinetobacter-baumannii-isolates-from-a-period-of-increased-incidence-of-infections-in-a-southwest-virginia-hospital
#9
Jayasimha Rao, Dwi Susanti, Johnathon C Childress, Michael C Mitkos, Joshua K Brima, Anthony W Baffoe-Bonnie, Samuel N Pearce, Dale Grgurich, Maria Jose Fernandez-Cotarelo, Thomas M Kerkering, Biswarup Mukhopadhyay
OBJECTIVES: The objectives of this study were to determine the genetic basis for carbapenem resistance in multidrug-resistant Acinetobacter baumannii strains isolated from patients affected by a sudden increase in the incidence of infections by such organisms in a tertiary care hospital in Virginia, USA, in 2009-2010 and to examine whether such strains are commonly encountered in the hospital setting. METHODS: The whole genomes of one outbreak strain, one carbapenem-resistant strain and one carbapenem-sensitive strain from sporadic infections in 2010-2012 were sequenced and analyzed...
September 9, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28899445/microbial-disruption-indices-to-detect-colonization-with-multidrug-resistant-organisms
#10
Rafael Araos, Veronica Montgomery, Juan A Ugalde, Graham M Snyder, Erika M C D'Agata
OBJECTIVE To characterize the microbial disruption indices of hospitalized patients to predict colonization with multidrug-resistant organisms (MDROs). DESIGN A cross-sectional survey of the fecal microbiome was conducted in a tertiary referral, acute-care hospital in Boston, Massachusetts. PARTICIPANTS The study population consisted of adult patients hospitalized in general medical/surgical wards. METHODS Rectal swabs were obtained from patients within 48 hours of hospital admission and screened for MDRO colonization using conventional culture techniques...
September 13, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/28898936/aerobic-composting-reduces-antibiotic-resistance-genes-in-cattle-manure-and-the-resistome-dissemination-in-agricultural-soils
#11
Min Gou, Hang-Wei Hu, Yu-Jing Zhang, Jun-Tao Wang, Helen Hayden, Yue-Qin Tang, Ji-Zheng He
Composting has been suggested as a potential strategy to eliminate antibiotic residues and pathogens in livestock manure before its application as an organic fertilizer in agro-ecosystems. However, the impacts of composting on antibiotic resistance genes (ARGs) in livestock manure and their temporal succession following the application of compost to land are not well understood. We examined how aerobic composting affected the resistome profiles of cattle manure, and by constructing laboratory microcosms we compared the effects of manure and compost application to agricultural soils on the temporal succession of a wide spectrum of ARGs...
September 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28895051/polymyxin-resistance-in-gram-negative-pathogens
#12
REVIEW
Pavithra Srinivas, Kaitlyn Rivard
PURPOSE OF REVIEW: The polymyxins are one of the last line antimicrobial classes to retain activity against multidrug-resistant Gram-negative bacilli. However, with the increased use of polymyxins in recent years, reports of resistance have also been increasing. We aimed to describe the mechanisms and occurrence of polymyxin resistance in Gram-negative organisms and propose strategies to overcome resistance. RECENT FINDINGS: The most common mechanism of acquired resistance to the polymyxins is via modification of the bacterial outer membrane lipopolysaccharide...
September 11, 2017: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/28894024/the-synergistic-antimicrobial-effects-of-novel-bombinin-and-bombinin-h-peptides-from-the-skin-secretion-of%C3%A2-bombina-orientalis
#13
Jie Xiang, Mei Zhou, Yuxin Wu, Tianbao Chen, Chris Shaw, Lei Wang
Bombinin and bombinin H are two antimicrobial peptide (AMP) families initially discovered from the skin secretion of Bombina that share the same biosynthetic precursor-encoding cDNAs, but have different structures and physicochemical properties. Insight into their possible existing relationship lead us to perform the combination investigations into their anti-infectious activities. In this work, we report the molecular cloning and functional characterisation of two novel AMPs belonging to bombinin and bombinin H families from secretions of Bombina orientalis Their mature peptides (BHL-bombinin and bombinin HL), coded by single open-reading frame (ORF), were chemically synthesised along with an analogue peptide that replaced L-leucine with D-leucine from the 2nd position of the N-terminus (bombinin HD)...
September 11, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28892887/active-surveillance-of-health-care-associated-infections-in-neurosurgical-patients
#14
Reshu Agarwal, Sarita Mohapatra, Girija Prasad Rath, Arti Kapil
INTRODUCTION: Health Care Associated Infections (HCAI) are frequent complications in neurosurgery. There is limited data available on the incidence and burden of HCAI in neurosurgical patients of Southeast Asian region. AIM: To identify various HCAIs, associated aetiological agents and their antimicrobial susceptibility pattern among the patients admitted in the neurosurgery unit. MATERIALS AND METHODS: An observational prospective study was carried out for three months duration on all neurosurgical patients admitted to a tertiary-care center...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28892282/diabetic-foot-infection-antibiotic-therapy-and-good-practice-recommendations
#15
Nicholas D Barwell, Marion C Devers, Brian Kennon, Helen E Hopkinson, Claire McDougall, Matthew J Young, Hannah M A Robertson, Duncan Stang, Stephanie J Dancer, Andrew Seaton, Graham P Leese
BACKGROUND: Healthcare events related to diabetic foot disease carry a burden of morbidity, mortality and economic cost. Prompt identification of clinical infection with appropriate tissue sampling limits use of broad spectrum empirical antibiotics and improves antibiotic stewardship. Staphylococcus aureus remains the commonest infecting organism and high-dose flucloxacillin remains the empirical antibiotic of choice for antibiotic naïve patients. Barriers to microbe-specific treatment include: adequate tissue sampling, delays in culture results, drug allergies and the emergence of multidrug-resistant organisms which can complicate the choice of targeted antibiotics...
September 11, 2017: International Journal of Clinical Practice
https://www.readbyqxmd.com/read/28885936/vancomycin-vs-vancomycin-piperacillin-tazobactam-associated-acute-kidney-injury-in-noncritically-ill-patients-at-a-tertiary-care-military-treatment-facility
#16
Caleb W Anderson, Kathy S Cazares, Michael B Lustik, Shivam M Patel, Troy M Denunzio
BACKGROUND: Broad-spectrum antibiotics are often used as initial empiric therapy in patients at risk for infections by multidrug-resistant organisms. Emerging literature and anecdotal reports within Tripler Army Medical Center indicate an increased incidence of vancomycin-associated acute kidney injury when used in combination with piperacillin-tazobactam. This is a retrospective, single-center study comparing the incidence of acute kidney injury in noncritically ill patients receiving either vancomycin or vancomycin in combination with piperacillin-tazobactam in a 206-bed tertiary care military training facility...
September 2017: Military Medicine
https://www.readbyqxmd.com/read/28885921/acquisition-of-multidrug-resistant-gram-negative-organisms-during-travel
#17
Clinton K Murray, Dana M Blyth
The rate of multidrug resistance has continued to increase worldwide, presenting clinicians with further challenges related to patient care. In this article, we review information related to the acquisition of multidrug-resistant (MDR) Gram-negative organisms among travelers, including deployed personnel, as well as the potential impact on wound microbiology and travelers' diarrhea. Travel to Asia, experiencing travelers' diarrhea, and use of antibiotics, whereas abroad have been associated with an increased risk of acquiring MDR Enterobacteriaceae colonization...
September 2017: Military Medicine
https://www.readbyqxmd.com/read/28883707/donor-derived-infections-among-chinese-donation-after-cardiac-death-liver-recipients
#18
Qi-Fa Ye, Wei Zhou, Qi-Quan Wan
AIM: To investigate blood cultures of deceased donors and report the confirmed transmission of bacterial infection from donors to liver recipients. METHODS: We retrospectively studied the results of blood cultures among our donation after cardiac death (DCD) donors and calculated the donor-derived bacterial infection rates among liver recipients. Study participants underwent liver transplantation between January 1, 2010 and February 1, 2017. The study involved a total of 67 recipients of liver grafts from 67 DCD donors...
August 21, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28882019/usefulness-of-hospital-at-home-in-nosocomial-infections-advantages-and-limitations
#19
REVIEW
V J González Ramallo, M Mirón Rubio, O Estrada Cuxart, M E García Leoni
Hospital at Home units allows ambulatory treatment and monitoring of complex and serious infections. Nosocomial infections produce an extension of the stay in hospital often specifying long intravenous treatments without any effective oral alternatives. Daily dosing of antimicrobial are easier to administer at home. The use of portable programmable pump infusion and elastomeric devices allow efficient and safe infu-sions for most antimicrobials at home. Some antibiotics against multidrug-resistant organisms of recent introduction have a suitable profile for outpatient intravenous treatment...
September 2017: Revista Española de Quimioterapia: Publicación Oficial de la Sociedad Española de Quimioterapia
https://www.readbyqxmd.com/read/28880970/optimization-of-western-blotting-analysis-for-the-isolation-and-detection-of-membrane-xenobiotic-transporter-abcg2
#20
Małgorzata Szczygieł, Marcin Markiewicz, Milena Szafraniec, Roxana Zuziak, Krystyna Urbańska, Leszek Fiedor
All organisms are exposed to numerous stress factors, which include harmful xenobiotics. The diversity of these compounds is enormous, thus in the course of evolution diverse biological defense mechanisms at various levels of organization have developed. One of them engages an evolutionarily conserved family of transporters from the ABC superfamily, found in most species - from bacteria to humans. An important example of such a transporter is the breast cancer resistance protein (BCRP/ABCG2), a typical integral membrane protein...
2017: Acta Biochimica Polonica
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