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https://www.readbyqxmd.com/read/28521000/the-ecology-of-extended-spectrum-%C3%AE-lactamases-esbls-in-the-developed-world
#1
Yohei Doi, Alina Iovleva, Robert A Bonomo
Background: Since the initial appearance in the 1980s, Enterobacteriaceae producing extended-spectrum β-lactamase (ESBL) have increased in prevalence and emerged as a major antimicrobial-resistant pathogen. The source of these antimicrobial-resistant bacteria in the developed world is an area of active investigation. Methods: A standard internet search was conducted with a focus on the epidemiology and potential sources of ESBL-producing Enterobacteriaceae in the developed world...
April 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28504818/characterization-of-escherichia-coli-clinical-isolates-causing-urinary-tract-infections-in-the-community-of-chilpancingo-mexico
#2
Jesús A Hernández-Vergara, Verónica I Martínez-Santos, Romina B Radilla-Vázquez, Jesús Silva-Sánchez, Amalia Vences-Velásquez, Natividad Castro-Alarcón
Escherichia coli is the main cause of urinary tract infections (UTI) in ambulatory patients, especially strains belonging to the B2 phylogenetic group and ST131 clonal group. Antibiotic treatment is usually administered empirically; however, it is not always effective due to bacterial multidrug resistance and the production of extended spectrum β-lactamases (ESBLs). The aim of this study was to characterize E. coli clinical isolates from patients with UTI in a community of the State of Guerrero, Mexico. From January to August 2014, 134 clinical isolates of E...
December 2016: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28489862/novel-genes-associated-with-enhanced-motility-of-escherichia-coli-st131
#3
Asha Kakkanat, Minh-Duy Phan, Alvin W Lo, Scott A Beatson, Mark A Schembri
Uropathogenic Escherichia coli (UPEC) is the cause of ~75% of all urinary tract infections (UTIs) and is increasingly associated with multidrug resistance. This includes UPEC strains from the recently emerged and globally disseminated sequence type 131 (ST131), which is now the dominant fluoroquinolone-resistant UPEC clone worldwide. Most ST131 strains are motile and produce H4-type flagella. Here, we applied a combination of saturated Tn5 mutagenesis and transposon directed insertion site sequencing (TraDIS) as a high throughput genetic screen and identified 30 genes associated with enhanced motility of the reference ST131 strain EC958...
2017: PloS One
https://www.readbyqxmd.com/read/28479289/nationwide-surveillance-of-clinical-carbapenem-resistant-enterobacteriaceae-cre-strains-in-china
#4
Rong Zhang, Lizhang Liu, Hongwei Zhou, Edward Waichi Chan, Jiaping Li, Ying Fang, Yi Li, Kang Liao, Sheng Chen
The increasing incidence of carbapenem-resistant Enterobacteriaceae (CRE) - mediated hospital infections in China prompted a need to investigate the genetic basis of emergence of such strains. A nationwide survey was conducted in China covering a total of 1105 CRE strains collected from 25 geographical locales with results showing that acquisition of two carbapenemase genes, blaKPC-2 and blaNDM, was responsible for phenotypic resistance in 90% of the CRE strains tested (58% and 32% respectively), among which several major strain types, such as ST11 of K...
April 26, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28473817/comprehensive-diagnosis-of-bacterial-infection-associated-with-acute-cholecystitis-using-metagenomic-approach
#5
Manabu Kujiraoka, Makoto Kuroda, Koji Asai, Tsuyoshi Sekizuka, Kengo Kato, Manabu Watanabe, Hiroshi Matsukiyo, Tomoaki Saito, Tomotaka Ishii, Natsuya Katada, Yoshihisa Saida, Shinya Kusachi
Acute cholecystitis (AC), which is strongly associated with retrograde bacterial infection, is an inflammatory disease that can be fatal if inappropriately treated. Currently, bacterial culture testing, which is basically recommended to detect the etiological agent, is a time-consuming (4-6 days), non-comprehensive approach. To rapidly detect a potential pathogen and predict its antimicrobial susceptibility, we undertook a metagenomic approach to characterize the bacterial infection associated with AC. Six patients (P1-P6) who underwent cholecystectomy for AC were enrolled in this study...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28467251/a-first-insight-into-escherichia-coli-st131-high-risk-clone-among-extended-spectrum-beta-lactamase-producing-urine-isolates-in-istanbul-with-the-use-of-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-and-real-time-pcr
#6
Elif Aktaş, Barış Otlu, Duygu Erdemir, Hatice Ekici, Emin Bulut
OBJECTIVES: We aim to investigate, as a first insight, the presence and rates of high-risk Escherichia coli ST131 clone in Istanbul and evaluate antimicrobial resistance and CTX-M-15 production of ST131 and non-ST131 isolates. The use of MALDI-TOF MS (matrix-assisted laser desorption/ionization time-of-flight mass-spectrometry) to detect E. coli ST131 clone is also evaluated. MATERIALS AND METHODS: A total of 203 extended-spectrum beta-lactamase (ESBL)-producing urinary isolates from a training hospital in Istanbul were investigated...
May 3, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28459221/association-between-virulence-profile-and-fluoroquinolone-resistance-in-escherichia-coli-isolated-from-dogs-and-cats-in-china
#7
Xiaoqiang Liu, Haixia Liu, Yinqian Li, Caiju Hao
INTRODUCTION: Escherichia coli is not only a commensal organism in humans and animals, but also a causative agent of diarrhea and extraintestinal infections. Information about the relationship between population structure, virulence gene profiles, and fluoroquinolone resistance of E. coli in dogs and cats in China is limited. METHODOLOGY: A total of 174 pathogenic and commensal E. coli isolates were evaluated in terms of phylogenetic group, virulence gene profile, sequence types (STs), and fluoroquinolone susceptibility...
April 30, 2017: Journal of Infection in Developing Countries
https://www.readbyqxmd.com/read/28450661/prevalence-and-molecular-characterization-of-extended-spectrum-%C3%AE-lactamase-esbl-and-plasmidic-ampc-%C3%AE-lactamase-pampc-producing-escherichia-coli-in-dogs
#8
Özkan Aslantas, Ebru Sebnem Yilmaz
This study aimed to determine the prevalence of fecal carriage of extended spectrum β-lactamase (ESBL) and/or plasmidic AmpC β-lactamase (pAmpC) producing Escherichia coli among dogs (n=428) in Turkey. Polymerase chain reaction (PCR) and sequencing were used to characterize genes encoding β-lactamase genes and plasmid mediated quinolone resistance (PMQR). Antimicrobial susceptibility testing and PCRs for virulence genes and phylogenetic groups were also performed. Cefotaxime resistant E. coli isolates were detected in 95 (22...
April 27, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28439032/inactivation-of-transcriptional-regulators-during-within-household-evolution-of-escherichia-coli
#9
Dagmara I Kisiela, Matthew Radey, Sandip Paul, Stephen Porter, Kseniya Polukhina, Veronika Tchesnokova, Sofiya Shevchenko, Diana Chan, Maliha Aziz, Timothy J Johnson, Lance B Price, James R Johnson, Evgeni V Sokurenko
We analyzed the within-household evolution of two household-associated Escherichia coli strains from pandemic clonal group ST131-H30, using isolates recovered from five individuals within two families, each of which had a distinct strain. Family 1's strain was represented by a urine isolate from the index patient (older sister) with recurrent cystitis, and a blood isolate from her younger sister with fatal urosepsis. Family 2's strain was represented by a urine isolate from the index patient (father) with pyelonephritis and renal abscesses, blood and kidney drainage isolates from the daughter with emphysematous pyelonephritis, and urine and fecal isolates from the mother with cystitis...
April 24, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28437226/first-report-of-prevalence-of-ctx-m-15-producing-escherichia-coli-o25b-st131-from-iran
#10
Mohammad Hasan Namaei, Masoud Yousefi, Masoud Ziaee, Alireza Salehabadi, Malaknaz Ghannadkafi, Elham Amini, Parvin Askari
The emergence of Escherichia coli sequence type 131 (ST131) as a multidrug-resistant and virulent pathogen represents a major challenge to public health globally. Recently, the O25b/ST131 E. coli producing CTX-M-15 with high virulence potential has been reported worldwide, but has received little attention in Iran. This study is the first in Iran to specifically determine the spread of the O25b/ST131 clone producing CTX-M-15 among E. coli isolates belonging to the B2 phylogenetic group. ST131 clone in phylogenetic group B2 was detected based on PCR detection of ST131-specific single-nucleotide polymorphisms in mdh and gyrB...
February 16, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28419868/ciprofloxacin-resistance-in-uropathogenic-escherichia-coli-isolates-causing-community-acquired-urinary-infections-in-bras%C3%A3-lia-brazil
#11
Rafaella Christina Rocha Moreira da Silva, Paulo de Oliveira Martins Júnior, Laura Fernandes Gonçalves, Vicente de Paulo Martins, Ana Beatriz Fabrício de Melo, André Pitondo-Silva, Tatiana Amabile de Campos
OBJECTIVES: Considering the global concern of ciprofloxacin resistance, the aim of this study was to evaluate the characteristics of ciprofloxacin-resistant (CIP-R) Escherichia coli isolated from patients with community-acquired urinary tract infections (UTIs) in Brasília, Brazil. METHODS: CIP-R E. coli isolated from different outpatients between July 2013 and April 2014 in a tertiary hospital were analysed for antibiotic resistance profile, phylotype, uropathogenic E...
April 15, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28416542/high-resolution-melting-analysis-for-the-rapid-detection-of-sequence-type-131-escherichia-coli
#12
Lucas B Harrison, Nancy D Hanson
IntroductionE. coli belonging to sequence type 131 clonal complex (ST131) have been associated with the global distribution of fluoroquinolone and β-lactam resistance. Whole genome sequencing and multi-locus sequence typing identify sequence type but are expensive when evaluating large numbers of samples. This study was designed to develop a cost-effective screening tool using high resolution melting (HRM) analysis to differentiate ST131 from non-ST-131 E. coli in large sample populations in the absence of sequence analysis...
April 17, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28412380/colonization-by-multidrug-resistant-organisms-in-long-term-care-facilities-in-italy-a-point-prevalence-study
#13
Maria Giufrè, Enrico Ricchizzi, Marisa Accogli, Fabrizio Barbanti, Monica Monaco, Fernanda Pimentel de Araujo, Claudio Farina, Paolo Fazii, Romano Mattei, Mario Sarti, Agostino Barozzi, Rossella Buttazzi, Marina Cosentino, Maria Nardone, Vincenzo Savini, Patrizia Spigaglia, Annalisa Pantosti, Maria Luisa Moro, Marina Cerquetti
OBJECTIVES: This study aimed to determine prevalence and risk factors for colonization by multidrug-resistant organisms (MDROs) in long-term care facility (LTCF) residents in Italy. Genotypes of MDRO isolates were investigated. METHODS: A point-prevalence study was conducted at 12 LTCFs located in 4 Italian cities (2 February-14 March 2015). Rectal swabs, faeces and nasal/auxiliary swabs were cultured for extended-spectrum β-lactamase (ESBL)- and/or carbapenemase-producing Enterobacteriaceae, Clostridium difficile and methicillin-resistant Staphylococcus aureus (MRSA), respectively...
April 12, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28401893/bacteriophages-from-expec-reservoirs-kill-pandemic-multidrug-resistant-strains-of-clonal-group-st131-in-animal-models-of-bacteremia
#14
Sabrina I Green, Jason T Kaelber, Li Ma, Barbara W Trautner, Robert F Ramig, Anthony W Maresso
Multi-drug resistant (MDR) enteric bacteria are of increasing global concern. A clonal group, Escherichia coli sequence type (ST) 131, harbors both MDR and a deadly complement of virulence factors. Patients with an immunocompromised system are at high risk of infections with these E. coli and there is strong epidemiologic evidence that the human intestinal tract, as well as household pets, may be a reservoir. Here, we examine if phages are an effective treatment strategy against this clonal group in murine models of bacteremia that recapitulate clinical infections...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28380311/spread-of-ctx-type-extended-spectrum-%C3%AE-lactamase-producing-escherichia-coli-isolates-of-epidemic-clone-b2-o25-st131-among-dogs-and-cats-in-japan
#15
Kumiko Kawamura, Tae Sugawara, Nao Matsuo, Kengo Hayashi, Chihiro Norizuki, Kiyoko Tamai, Takaaki Kondo, Yoshichika Arakawa
This study was performed to investigate the carriage rates of CTX-M-type extended-spectrum β-lactamase (ESBL)-producing Escherichia coli among ill companion animals in Japan. Among the 178 nonrepetitive E. coli isolates, including 131 from dogs and 47 from cats, collected between September and November 2015, 42 (23.6%) isolates from 29 dogs and 13 cats were identified as ESBL producers. The antimicrobial susceptibility, O serotype, phylogenetic group, β-lactamase genotype, plasmid replicon type, and sequence type (ST) of each isolate were analyzed...
April 5, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28369408/wgs-based-surveillance-of-third-generation-cephalosporin-resistant-escherichia-coli-from-bloodstream-infections-in-denmark
#16
Louise Roer, Frank Hansen, Martin Christen Frølund Thomsen, Jenny Dahl Knudsen, Dennis Schrøder Hansen, Mikala Wang, Jurgita Samulioniené, Ulrik Stenz Justesen, Bent L Røder, Helga Schumacher, Claus Østergaard, Leif Percival Andersen, Esad Dzajic, Turid Snekloth Søndergaard, Marc Stegger, Anette M Hammerum, Henrik Hasman
Objectives: To evaluate a genome-based surveillance of all Danish third-generation cephalosporin-resistant Escherichia coli (3GC-R Ec ) from bloodstream infections between 2014 and 2015, focusing on horizontally transferable resistance mechanisms. Methods: A collection of 552 3GC-R Ec isolates were whole-genome sequenced and characterized by using the batch uploader from the Center for Genomic Epidemiology (CGE) and automatically analysed using the CGE tools according to resistance profile, MLST, serotype and fimH subtype...
March 22, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28365752/high-frequency-of-b2-phylogroup-among-non-clonally-related-fecal-escherichia-coli-isolates-from-wild-boars-including-the-lineage-st131
#17
Carla Andrea Alonso, David González-Barrio, Francisco Ruiz-Fons, Laura Ruiz-Ripa, Carmen Torres
Wild boars are worldwide distributed mammals which population is increasing in many regions, like the Iberian Peninsula, leading to an increased exposition to humans. They are considered reservoirs of different zoonotic pathogens and have been postulated as potential vectors of antimicrobial-resistant (AMR) bacteria. This study aimed to determine the prevalence of antimicrobial resistance and phylogenetic distribution of Escherichia coli from wild boar feces. Antimicrobial resistance and integron content was genetically characterized and E...
March 1, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28347271/the-st131-escherichia-coli-h22-subclone-from-human-intestinal-microbiota-comparison-of-genomic-and-phenotypic-traits-with-those-of-the-globally-successful-h30-subclone
#18
Marie-Hélène Nicolas-Chanoine, Marie Petitjean, Azucena Mora, Noémie Mayer, Jean-Philippe Lavigne, Olivier Boulet, Véronique Leflon-Guibout, Jorge Blanco, Didier Hocquet
BACKGROUND: In 2006, we found healthy subjects carrying ST131 Escherichia coli in their intestinal microbiota consisting of two populations: a subdominant population of fluoroquinolone-resistant E. coli belonging to subclone H30 (H30-R or subclade C1), the current worldwide dominant ST131 subclone, and a dominant E. coli population composed of antibiotic-susceptible E. coli belonging to subclone H22 (clade B), the precursor of subclone H30. We sequenced the whole genome of fecal H22 strain S250, compared it to the genomes of ExPEC ST131 H30-Rx strain JJ1886 and commensal ST131 H41 strain SE15, sought the H22-H30 genomic differences in our fecal strains and assessed their phenotypic consequences...
March 27, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28344773/escherichia-coli-st131-a-multidrug-resistant-clone-primed-for-global-domination
#19
REVIEW
Johann D D Pitout, Rebekah DeVinney
A single extra-intestinal pathogenic Escherichia coli (ExPEC) clone, named sequence type (ST) 131, is responsible for millions of global antimicrobial-resistant (AMR) infections annually. Population genetics indicate that ST131 consists of different clades (i.e. A, B, and C); however, clade C is the most dominant globally. A ST131 subclade, named C1-M27, is emerging in Japan and has been responsible for the recent increase in AMR ExPEC in that country. The sequential acquisition of several virulence and AMR genes associated with mobile genetic elements during the 1960s to 1980s primed clade C (and its subclades C1 and C2) for success in the 1990s to 2000s...
2017: F1000Research
https://www.readbyqxmd.com/read/28333330/genomic-landscape-of-extended-spectrum-%C3%AE-lactamase-resistance-in-escherichia-coli-from-an-urban-african-setting
#20
Patrick Musicha, Nicholas A Feasey, Amy K Cain, Teemu Kallonen, Chrispin Chaguza, Chikondi Peno, Margaret Khonga, Sarah Thompson, Katherine J Gray, Alison E Mather, Robert S Heyderman, Dean B Everett, Nicholas R Thomson, Chisomo L Msefula
Objectives: Efforts to treat Escherichia coli infections are increasingly being compromised by the rapid, global spread of antimicrobial resistance (AMR). Whilst AMR in E. coli has been extensively investigated in resource-rich settings, in sub-Saharan Africa molecular patterns of AMR are not well described. In this study, we have begun to explore the population structure and molecular determinants of AMR amongst E. coli isolates from Malawi. Methods: Ninety-four E...
June 1, 2017: Journal of Antimicrobial Chemotherapy
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