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https://www.readbyqxmd.com/read/28087584/emergence-of-klebsiella-variicola-positive-for-ndm-9-a-variant-of-new-delhi-metallo-%C3%AE-lactamase-in-an-urban-river-in-south-korea
#1
Doris Y W Di, Jeonghwan Jang, Tatsuya Unno, Hor-Gil Hur
OBJECTIVES: To examine the presence of pathogenic bacteria carrying New Delhi metallo-β-lactamase in the environment and to characterize the genome structures of these strains. METHODS: Phenotypic screening of antimicrobial susceptibility and WGS were conducted on three Klebsiella variicola strains possessing NDM-9 isolated from an urban river. RESULTS: Three carbapenem-resistant K. variicola isolated from Gwangju tributary were found to possess blaNDM-9 genes...
January 12, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28081324/treatment-efficacy-and-superinfection-rates-in-complicated-urinarytract-infections-treated-with-ertapenem-or-piperacillin-tazobactam
#2
Murat Dizbay, Hasan Selçuk Özger, Ömer Karaşahin, Emine Fusun Karaşahin
BACKGROUND/AIM: In this retrospective study, the efficacy of ertapenem and piperacillin tazobactam was compared in the treatment of complicated urinary tract infections (cUTIs). Treatment responses were also evaluated for both antibiotics. MATERIALS AND METHODS: A total of 230 patients were enrolled in the study. Of these, 170 received ertapenem and 60 received piperacillin-tazobactam. RESULTS: In both groups, urine cultures after 48 h were negative for the initial uropathogen...
December 20, 2016: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/28078492/first-report-of-bla-ctx-m-15-type-esbl-producing-klebsiella-pneumoniae-in-wild-migratory-birds-in-pakistan
#3
Shahbaz Raza, Mashkoor Mohsin, Waqas Ahmed Madni, Fatima Sarwar, Muhammad Saqib, Bilal Aslam
We investigated wild migratory birds faecal swabs for extended-spectrum β-lactamases-producing Klebsiella pneumoniae (ESBL-K. pneumoniae) from wetland habitats in Pakistan. ESBL-K. pneumoniae were analysed for MDR phenotype, ESBL genotype and genetic diversity. A total of 13 (8.6%) ESBL-K. pneumoniae were recovered. Of these, 8 (61%) isolates were MDR. DNA sequencing confirmed bla CTX-M-15 as the dominant ESBL genotype. BOX-PCR fingerprints showed most of the isolates are unrelated. This study is the first to report the wildlife contamination of CTX-M-15-producing K...
January 11, 2017: EcoHealth
https://www.readbyqxmd.com/read/28077674/population-structure-of-japanese-extraintestinal-pathogenic-escherichia-coli-and-its-relationship-with-antimicrobial-resistance
#4
Yasufumi Matsumura, Taro Noguchi, Michio Tanaka, Toru Kanahashi, Masaki Yamamoto, Miki Nagao, Shunji Takakura, Satoshi Ichiyama
OBJECTIVES: To define the population structure of extraintestinal pathogenic Escherichia coli (ExPEC) in Japan and its relationship with antimicrobial resistance and the major resistance mechanisms for fluoroquinolones and β-lactams, we designed a multicentre prospective study. METHODS: A total of 329 ExPEC isolates were collected at 10 Japanese acute-care hospitals during December 2014. We defined the clonal groups of ExPEC by fumC and fimH sequencing (CH typing)...
January 10, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28076388/risk-factors-for-multi-drug-resistant-pathogens-and-failure-of-empiric-first-line-therapy-in-acute-cholangitis
#5
Philipp A Reuken, Dorian Torres, Michael Baier, Bettina Löffler, Christoph Lübbert, Norman Lippmann, Andreas Stallmach, Tony Bruns
BACKGROUND: Acute cholangitis (AC) requires the immediate initiation of antibiotic therapy in addition to treatment for biliary obstruction. Against a background of an increasing prevalence of multi-drug resistant (MDR) bacteria, the risk factors for the failure of empiric therapy must be defined. METHODS: Using a pathogen-based approach, 1764 isolates from positive bile duct cultures were retrospectively analyzed to characterize the respective pathogen spectra in two German tertiary centers...
2017: PloS One
https://www.readbyqxmd.com/read/28074126/the-emergence-of-carbapenem-resistant-klebsiella-pneumoniae-in-malaysia-correlation-between-microbiological-trends-with-host-characteristics-and-clinical-factors
#6
Ye-Mun Low, Polly Soo-Xi Yap, Kartini Abdul Jabar, Sasheela Ponnampalavanar, Rina Karunakaran, Rukumani Velayuthan, Chun-Wie Chong, Sazaly Abu Bakar, Mohd Yasim Md Yusof, Cindy Shuan-Ju Teh
BACKGROUND: Carbapenem resistant Enterobacteriaceae is a growing concern worldwide including Malaysia. The emergence of this pathogen is worrying because carbapenem is one of the 'last-line' antibiotics. The main objective of this study was to determine the prevalence of genetic mechanisms and clinical risk factors of carbapenem resistant Klebsiella pneumoniae (K. pneumoniae) in Malaysia. METHODS: In this study, seventeen carbapenem resistant K. pneumoniae strains isolated from a tertiary teaching hospital in 2013 were studied...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28073961/genetic-characterization-of-mcr-1-bearing-plasmids-to-depict-molecular-mechanisms-underlying-dissemination-of-the-colistin-resistance-determinant
#7
Ruichao Li, Miaomiao Xie, Jinfei Zhang, Zhiqiang Yang, Lizhang Liu, Xiaobo Liu, Zhiwei Zheng, Edward Wai-Chi Chan, Sheng Chen
OBJECTIVES: To analyse and compare mcr-1-bearing plasmids from animal Escherichia coli isolates, and to investigate potential mechanisms underlying dissemination of mcr-1. METHODS: Ninety-seven ESBL-producing E. coli strains isolated from pig farms in China were screened for the mcr-1 gene. Fifteen mcr-1-positive strains were subjected to molecular characterization and bioinformatic analysis of the mcr-1-bearing plasmids that they harboured. RESULTS: Three major types of mcr-1-bearing plasmids were recovered: IncX4 (∼33 kb), IncI2 (∼60 kb) and IncHI2 (∼216-280 kb), among which the IncX4 and IncI2 plasmids were found to harbour the mcr-1 gene only, whereas multiple resistance elements including blaCTX-M, blaCMY, blaTEM, fosA, qnrS, floR and oqxAB were detected, in various combinations, alongside mcr-1 in the IncHI2 plasmids...
September 28, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28072891/molecular-epidemiology-and-resistome-analysis-of-multidrug-resistant-st11-klebsiella-pneumoniae-strain-containing-multiple-copies-of-extended-spectrum-%C3%AE-lactamase-genes-using-whole-genome-sequencing
#8
Roshan DSouza, Naina Adren Pinto, Insik Hwang, Hwang Younjee, YoungLag Cho, Hyunsoo Kim, Dongeun Yong, Jongrak Choi, Kyungwon Lee, Yunsop Chong
The aim of this work was to investigate the mechanism responsible for multidrug resistance in ST11 Klebsiella pneumoniae YMC 2013/7/B3993 containing multiple copies of ESBL genes using multiple parallel sequencing technology. In-depth analysis of the strain revealed multiple copies of ESBL genes, 2 copies of blaSHV-12 and 1 copy of blaCTX-M-15. Furthermore, 1 copy of blaOXA-9 and 3 copies of blaTEM-1 were found. The insertion of Tn1331 was detected, which consisted of blaOXA-9, blaTEM-1, aac(6')-lb-cr, and aadA1 genes...
January 10, 2017: New Microbiologica
https://www.readbyqxmd.com/read/28071193/screening-of-esbl-producing-enterobacteriacae-concomitant-with-low-degree-of-transmission-in-intensive-care-and-bone-marrow-transplant-units
#9
Giuseppe Valenza, Monika Schulze, Petra Friedrich, Wulf Schneider-Brachert, Thomas Holzmann, Silke Nickel, Verena Lehner-Reindl, Christiane Höller
BACKGROUND: Extended-spectrum β-lactamase-producing Enterobacteriaceae (ESBL-E) are spreading worldwide in both hospital and community settings. In this study, the molecular epidemiology and the transmission modalities of ESBL-E in intensive care- and bone marrow transplant were investigated. METHODS: All patients included in this study were screened for presence of ESBL-E on admission and weekly. Relevant β-lactamase genes were identified by PCR and sequencing...
January 10, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28069649/antimicrobial-activity-of-ceftazidime-avibactam-when-tested-against-gram-negative-bacteria-isolated-from-patients-hospitalized-with-pneumonia-in-united-states-medical-centers-2011-2015
#10
Helio S Sader, Mariana Castanheira, Robert K Flamm
Bacterial isolates were collected from patients hospitalized with pneumonia (PHP), including ventilator-associated (VAP), from 76 USA medical centers in 2011-2015. The Gram-negative organisms (n=11,185; including 1,097 from VAP) were tested for susceptibility against ceftazidime-avibactam and comparators by broth microdilution method. β-lactamase-encoding genes were screened using a microarray based assay on selected isolates. Pseudomonas aeruginosa and Klebsiella spp. were the most common Gram-negatives isolated from PHP and VAP...
January 9, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28069328/antimicrobial-activity-of-ceftazidime-avibactam-and-comparator-agents-when-tested-against-bacterial-isolates-causing-infection-in-cancer-patients-2013-2014
#11
Helio S Sader, Mariana Castanheira, Ronald N Jones, Robert K Flamm
We evaluated the antimicrobial susceptibility of 623 Gram-negative organisms causing infection in patients with cancer in 52 United States hospitals (2013-2014) as part of the International Network for Optimal Resistance Monitoring (INFORM) program. Isolates were tested for susceptibility by broth microdilution method. β-lactamase encoding genes were evaluated for all Escherichia coli and Klebsiella spp. with an extended-spectrum β-lactamase (ESBL) phenotype by microarray-based assay. ESBL-phenotype was observed among 17...
November 29, 2016: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28062685/development-and-validation-of-the-increment-esbl-predictive-score-for-mortality-in-patients-with-bloodstream-infections-due-to-extended-spectrum-%C3%AE-lactamase-producing-enterobacteriaceae
#12
Zaira Raquel Palacios-Baena, Belén Gutiérrez-Gutiérrez, Marina De Cueto, Pierluigi Viale, Mario Venditti, Alicia Hernández-Torres, Antonio Oliver, Luis Martínez-Martínez, Esther Calbo, Vicente Pintado, Oriol Gasch, Benito Almirante, José Antonio Lepe, Johann Pitout, Murat Akova, Carmen Peña-Miralles, Mitchell J Schwaber, Mario Tumbarello, Evelina Tacconelli, Julia Origüen, Nuria Prim, German Bou, Helen Giamarellou, Joaquín Bermejo, Axel Hamprecht, Federico Pérez, Manuel Almela, Warren Lowman, Po-Ren Hsueh, Carolina Navarro-San Francisco, Julián Torre-Cisneros, Yehuda Carmeli, Robert A Bonomo, David L Paterson, Álvaro Pascual, Jesús Rodríguez-Baño
BACKGROUND: Bloodstream infections (BSIs) due to ESBL-producing Enterobacteriaceae (ESBL-E) are frequent yet outcome prediction rules for clinical use have not been developed. The objective was to define and validate a predictive risk score for 30 day mortality. METHODS: A multinational retrospective cohort study including consecutive episodes of BSI due to ESBL-E was performed; cases were randomly assigned to a derivation cohort (DC) or a validation cohort (VC)...
January 6, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28061869/clinical-and-microbiologic-characteristics-of-cefotaxime-non-susceptible-enterobacteriaceae-bacteremia-a-case-control-study
#13
Taro Noguchi, Yasufumi Matsumura, Masaki Yamamoto, Miki Nagao, Shunji Takakura, Satoshi Ichiyama
BACKGROUND: Cefotaxime plays an important role in the treatment of patients with bacteremia due to Enterobacteriaceae, although cefotaxime resistance is reported to be increasing in association with extended-spectrum β-lactamase (ESBL) and AmpC β-lactamase (AmpC). METHODS: We conducted a case-control study in a Japanese university hospital between 2011 and 2012. We assessed the risk factors and clinical outcomes of bacteremia due to cefotaxime-non-susceptible Enterobacteriaceae (CTXNS-En) and analyzed the resistance mechanisms...
January 7, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28061852/the-occurrence-of-esbl-producing-escherichia-coli-carrying-aminoglycoside-resistance-genes-in-urinary-tract-infections-in-saudi-arabia
#14
Essam J Alyamani, Anamil M Khiyami, Rayan Y Booq, Majed A Majrashi, Fayez S Bahwerth, Elena Rechkina
BACKGROUND: The infection and prevalence of extended-spectrum β-lactamases (ESBLs) is a worldwide problem, and the presence of ESBLs varies between countries. In this study, we investigated the occurrence of plasmid-mediated ESBL/AmpC/carbapenemase/aminoglycoside resistance gene expression in Escherichia coli using phenotypic and genotypic techniques. METHODS: A total of 58 E. coli isolates were collected from hospitals in the city of Makkah and screened for the production of ESBL/AmpC/carbapenemase/aminoglycoside resistance genes...
January 6, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28061803/evaluation-of-mlva-for-epidemiological-typing-and-outbreak-detection-of-esbl-producing-escherichia-coli-in-sweden
#15
Lisa Helldal, Nahid Karami, Christina Welinder-Olsson, Edward R B Moore, Christina Åhren
BACKGROUND: To identify the spread of nosocomial infections and halt outbreak development caused by Escherichia coli that carry multiple antibiotic resistance factors, such as extended-spectrum beta-lactamases (ESBLs) and carbapenemases, is becoming demanding challenges due to the rapid global increase and constant and increasing influx of these bacteria from the community to the hospital setting. Our aim was to assess a reliable and rapid typing protocol for ESBL-E. coli, with the primary focus to screen for possible clonal relatedness between isolates...
January 6, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28057163/ceftazidime-avibactam-who-says-you-can-t-teach-an-old-drug-new-tricks
#16
Katie E Barber, Jessica K Ortwine, Ronda L Akins
PURPOSE: Gram-negative resistance continues to rise with treatment options becoming more limited. Ceftazidime/avibactam was recently approved in the United States and Europe, which combines an established third-generation cephalosporin with a new, unique, non-β-lactam β-lactamase inhibitor. This review conducts a thorough examination of structure, pharmacology, spectrum of activity, pharmacokinetics/pharmacodynamics, in vitro and clinical efficacy and safety/tolerability of ceftazidime/avibactam, as well as detailed future directions for the agent...
October 2016: Journal of Pharmacy & Pharmaceutical Sciences: a Publication of the Canadian Society for Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28056827/strain-specific-transmission-in-an-outbreak-of-esbl-producing-enterobacteriaceae-in-the-hemato-oncology-care-unit-a-cohort-study
#17
Makiko Uemura, Osamu Imataki, Shumpei Uchida, Haruyuki Nakayama-Imaohji, Yukiko Ohue, Harumi Matsuka, Hatsune Mori, Hiroaki Dobashi, Tomomi Kuwahara, Norimitsu Kadowaki
BACKGROUND: Extended-spectrum β-lactamase (ESBL)-producing bacteria are resistant to several types of antibiotics excluding carbapenems. A transmissibility of ESBL-producing Enterobacteriaceae would be depending on each bacterial property, however, that has not been elucidated in clinical setting. In this study, we attempted to identify the source of an outbreak of ESBL-producing bacteria in a medical oncology and immunology care unit. METHODS: An ESBL-producing Enterobacteriaceae (ESBL-E) outbreak observed between July 2012 and August 2012 in Kagawa University Hospital was surveyed using various molecular microbiology techniques...
January 5, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28056822/the-first-occurrence-of-a-ctx-m-esbl-producing-escherichia-coli-outbreak-mediated-by-mother-to-neonate-transmission-in-an-irish-neonatal-intensive-care-unit
#18
Ciara O'Connor, Roy K Philip, John Kelleher, James Powell, Alan O'Gorman, Barbara Slevin, Neil Woodford, Jane F Turton, Elaine McGrath, Cathriona Finnegan, Lorraine Power, Nuala H O'Connell, Colum P Dunne
BACKGROUND: Escherichia coli (E. coli) comprise part of the normal vaginal microflora. Transfer from mother to neonate can occur during delivery resulting, sometimes, in neonatal bacterial disease. Here, we aim to report the first outbreak of CTX-M ESBL-producing E. coli with evidence of mother-to-neonate transmission in an Irish neonatal intensive care unit (NICU) followed by patient-to-patient transmission. METHODS: Investigation including molecular typing was conducted...
January 5, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28056081/comparative-exposure-assessment-of-esbl-producing-escherichia-coli-through-meat-consumption
#19
Eric G Evers, Annemarie Pielaat, Joost H Smid, Engeline van Duijkeren, Francy B C Vennemann, Lucas M Wijnands, Jurgen E Chardon
The presence of extended-spectrum β-lactamase (ESBL) and plasmidic AmpC (pAmpC) producing Escherichia coli (EEC) in food animals, especially broilers, has become a major public health concern. The aim of the present study was to quantify the EEC exposure of humans in The Netherlands through the consumption of meat from different food animals. Calculations were done with a simplified Quantitative Microbiological Risk Assessment (QMRA) model. The model took the effect of pre-retail processing, storage at the consumers home and preparation in the kitchen (cross-contamination and heating) on EEC numbers on/in the raw meat products into account...
2017: PloS One
https://www.readbyqxmd.com/read/28054236/antibiotic-resistance-patterns-of-escherichia-coli-urinary-isolates-and-comparison-with-antibiotic-consumption-data-over-10%C3%A2-years-2005-2014
#20
P J Stapleton, D J Lundon, R McWade, N Scanlon, M M Hannan, F O'Kelly, M Lynch
INTRODUCTION: Escherichia coli is a common cause of urinary tract infections (UTI). Reviews of antibiotic resistance of this organism can inform choice of empiric treatment of UTI and other infections and strategies for combating antimicrobial resistance. We reviewed laboratory and hospital pharmacy records to assess trends in non-susceptibility rates and the effect of antimicrobial stewardship interventions. METHODS: A retrospective observational study of isolates of E...
January 4, 2017: Irish Journal of Medical Science
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