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Toyotaka Sato, Yuuki Suzuki, Tsukasa Shiraishi, Hiroyuki Honda, Masaaki Shinagawa, Soh Yamamoto, Noriko Ogasawara, Hiroki Takahashi, Satoshi Takahashi, Yutaka Tamura, Shin-Ichi Yokota
Tigecycline (TGC) is a last-line drug for multidrug-resistant Enterobacteriaceae. We investigated the mechanism(s) underlying TGC non-susceptibility (TGC-resistance/intermediate) in Escherichia coli clinical isolates. The MIC of TGC was determined for 277 fluoroquinolone-susceptible isolates (ciprofloxacin [CIP] MIC: <0.125 mg/L, and 194 fluoroquinolone-resistant isolates (CIP MIC: >2 mg/L). The MIC50 and MIC90 for TGC in fluoroquinolone-resistant isolates were 2-fold higher than those in fluoroquinolone-susceptible isolates (MIC50: 0...
November 14, 2016: Antimicrobial Agents and Chemotherapy
Belinda Vangchhia, Sam Abraham, Jan M Bell, Peter Collignon, Justine S Gibson, Paul R Ingram, James R Johnson, Karina Kennedy, Darren J Trott, John D Turnidge, David M Gordon
Unlike Escherichia coli strains belonging to phylogroup B2, the clinical significance of strains belonging to phylogroup F is not well understood. Here we report on a collection of phylogroup F strains recovered in Australia from faeces and extra-intestinal sites from humans, companion animals and native animals, as well as from poultry meat and water samples. The distribution of sequence types was clearly non-random with respect to isolate source. The antimicrobial resistance and virulence trait profiles also varied with the sequence type of the isolate...
November 2016: Microbiology
Ágnes Sonnevend, Akela Ghazawi, Manaf Alqahtani, Atef Shibl, Wafa Jamal, Rayhan Hashmey, Tibor Pal
OBJECTIVES: Searching for the presence of the mcr-1 gene in colistin resistant Enterobacteriaceae in countries of the Arabian Peninsula. METHODS: Seventy-five independent, colistin resistant Enterobacteriaceae strains isolated from clinical cases in Bahrain, Kuwait, Oman, Saudi Arabia and the United Arab Emirates were tested by PCR for the mcr-1 gene. mcr-1 positive strains were genotyped, and their antibiotic susceptibility was established. The mcr-1 containing plasmids were mobilized into Escherichia coli K-12 and their sequence was determined...
September 2016: International Journal of Infectious Diseases: IJID
Run-Shi Yang, Youjun Feng, Xiao-Yue Lv, Jia-Hong Duan, Jing Chen, Liang-Xing Fang, Jing Xia, Xiao-Ping Liao, Jian Sun, Ya-Hong Liu
Two E. coli clones (ST648 and ST156) that coproduce NDM-5 and MCR-1 were detected from a single fowl in China. The blaNDM-5 gene was found on the two indistinguishable IncX3 plasmids from the two different E. coli isolates, whereas the mcr-1 gene was located on IncHI2 and IncI2 plasmid respectively, suggesting that blaNDM-5 andmcr-1 have spread in avian intestinal flora. Also, the two strains harbor blaTEM-1, blaCTX-M-55, fosA3 and aac(6')-Ib The multi-resistant E. coli (esp. the epidemic clone ST648) might raise a potential threat to human health via food-chain transmission...
August 22, 2016: Antimicrobial Agents and Chemotherapy
Laura Fernandes Gonçalves, Paulo de Oliveira Martins-Júnior, Ana Beatriz Fabrício de Melo, Rafaella Christina Rocha Moreira da Silva, Vicente de Paulo Martins, André Pitondo-Silva, Tatiana Amabile de Campos
The aim of this work was to analyse extended-spectrum β-lactamase (ESBL)-producing Escherichia coli strains isolated from outpatients with signs of cystitis in Hospital Universitário de Brasília (Brasília, Brazil) during the period July 2013 to April 2014. E. coli isolated from urine culture were identified and their antibiotic susceptibility profile was determined by VITEK 2. ESBL-producing strains identified were submitted to PCR for Clermont phylotyping, CTX-M group typing and virulence determinant detection, and clonal relationships were determined by enterobacterial repetitive intergenic consensus (ERIC)-PCR...
September 2016: Journal of Global Antimicrobial Resistance
Xiaoqiang Liu, Kamoltip Thungrat, Dawn M Boothe
OBJECTIVE: The aim of this study was to explore the occurrence and molecular characterization of extended-spectrum β-lactamases (ESBL), plasmid-mediated AmpC β-lactamase (pAmpC) and carbapenemases among ESBL-producing multidrug resistant (MDR) Escherichia coli from dogs and cats in the United States. METHODS: Of 2443 E.coli isolated from dogs and cats collected between August 2009 and January 2013, 68 isolates were confirmed as ESBL-producing MDR ones. PCR and sequencing were performed to identify β-lactamases and plasmid-mediated quinolone resistance (PMQR) genes, and shed light on the virulence gene profiles, phylogenetic groups and ST types...
2016: Frontiers in Microbiology
Huimin Zhang, Christopher H Seward, Zuowei Wu, Huiyan Ye, Youjun Feng
Polymyxin acts as an ultimate line of refuge against the severe infections by multidrug-resistant Gram-negative pathogens. This conventional idea is challenged dramatically by the recent discovery of mobile colistin resistance gene (mcr-1) is prevalent in food animals and human beings worldwide. More importantly, the mcr-1 gene was found to be co-localized with other antibiotic resistance genes, raising the possibility that super-bugs with pan-drug resistance are emerging. However, little is reported on the genomes of the mcr-1-positive bacterial host reservoirs...
2016: Science Bulletin
Katharina Schaufler, Torsten Semmler, Derek J Pickard, María de Toro, Fernando de la Cruz, Lothar H Wieler, Christa Ewers, Sebastian Guenther
Pathogenic ESBL-producing E. coli lineages occur frequently worldwide, not only in a human health context but in animals and the environment, also in settings with low antimicrobial pressures. This study investigated the fitness costs of ESBL-plasmids and their influence on chromosomally encoded features associated with virulence, such as those involved in the planktonic and sessile behaviors of ST131 and ST648 E. coli. ESBL-plasmid-carrying wild-type E. coli strains, their corresponding ESBL-plasmid-"cured" variants (PCV), and complementary ESBL-carrying transformants were comparatively analyzed using growth curves, Omnilog® phenotype microarray (PM) assays, macrocolony and biofilm formation, swimming motility, and RNA sequence analysis...
2016: Frontiers in Microbiology
Badrul Hasan, Karl Laurell, Mufti Mahmud Rakib, Erik Ahlstedt, Jorge Hernandez, Mercedes Caceres, Josef D Järhult
Antibiotic-resistant bacteria are a major concern in the healthcare of today, especially the increasing number of gram-negative bacteria producing β-lactamases such as extended-spectrum β-lactamases (ESBLs). However, little is known about the relationship of ESBL producers in humans and domestic and wild birds, especially in a low-income setting. Therefore, we studied the fecal carriage of ESBL-producing Escherichia coli and Klebsiella pneumoniae in healthy humans, poultry, and wild birds in the vicinity of León, Nicaragua...
December 2016: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
Kunihiko Nakane, Kumiko Kawamura, Kensuke Goto, Yoshichika Arakawa
The actual state of intestinal long-term colonization by extended-spectrum β-lactamase (ESBL)-producing Escherichia coli in healthy Japanese people remains unclear. Therefore, a total of 4,314 fecal samples were collected from 2,563 food handlers from January 2010 to December 2011. Approximately 0.1 g of each fecal sample was inoculated onto a MacConkey agar plate containing cefotaxime (1 μg/ml). The bacterial colonies that grew on each plate were checked for ESBL production by the double-disk synergy test, as recommended by the Clinical and Laboratory Standards Institute...
March 2016: Applied and Environmental Microbiology
Andrea Müller, Roger Stephan, Magdalena Nüesch-Inderbinen
In this study, extended-spectrum ß-lactamase (ESBL)-producing Escherichia coli isolates recovered from the following sources were characterized with regard to the occurrence and distribution of uropathogenic and enteric pathogenic virulence factors: surface waters (rivers and lakes, n=60), the intestines of freshwater fish (n=33), fresh vegetables (n=26), retail poultry meat (n=13) and the fecal samples of livestock (n=28), healthy humans (n=34) and primary care patients (n=13). Among the 207 isolates, 82% tested positive by PCR for one or more of the virulence factors (VF) that predict uropathogenicity, TraT, fyuA, chuA, PAI, yfcv or vat...
January 15, 2016: Science of the Total Environment
Guofeng Xu, Yue Jiang, Wei An, Hongdong Wang, Xiuying Zhang
Three KPC-2-producing Escherichia coli (E1, E2, and E3) were recovered from water samples of an urban river in the city of Harbin, China. Antimicrobial susceptibility was determined by broth microdilution. Molecular characterization and genetic relatedness of the isolates were determined by polymerase chain reaction (PCR), pulsed-field gel electrophoresis (PFGE), multilocus sequence typing (MLST) and PCR-directed phylotyping. Plasmids were analyzed by conjugation, S1-PFGE, Southern blotting and PCR-based replicon typing (PBRT)...
September 2015: World Journal of Microbiology & Biotechnology
Carla Rodrigues, Elisabete Machado, João Pires, Helena Ramos, Ângela Novais, Luísa Peixe
AIM: To characterize temporal shifts in extended-spectrum β-lactamases (ESBLs) and clones of clinical Escherichia coli isolates. MATERIALS & METHODS: All ESBL-producing E. coli isolates from a Portuguese hospital (n = 112; June 2006-June 2007 and January-December 2010) were characterized by identification of phylogenetic groups, ESBL-types and virulence genes, XbaI-PFGE and MLST. RESULTS: We observed a substantial increase in widespread E...
2015: Future Microbiology
Ina Willemsen, Joost van Esser, Marjolein Kluytmans-van den Bergh, Kai Zhou, John W Rossen, Carlo Verhulst, Kees Verduin, Jan Kluytmans
INTRODUCTION: The laboratory detection of OXA-48-carbapenemase-producing Enterobacteriaceae is difficult, as minimum inhibition concentrations for carbapenems are often below the clinical breakpoint. In 2011, the Dutch national guideline for the detection of highly resistant micro-organisms was issued, which includes recommendations on the use of carbapenem screening breakpoints for the detection of carbapenemase-producing Enterobacteriaceae. MATERIALS AND METHODS: During a validation study of the Check-MDR CT103 microarray (Check-Points, Wageningen, The Netherlands) in 2013, an OXA-48-like carbapenemase gen was identified in two isolates that were previously obtained from a patient with non-Hodgkin lymphoma in 2007...
February 2016: Infection
Alexander M Wailan, David L Paterson, Michael Caffery, David Sowden, Hanna E Sidjabat
We report here the draft genome sequence of uropathogenic Escherichia coli sequence type 648 (ST648) possessing blaNDM-5 from a 55-year-old female in Australia with a history of travel to India. The plasmid-mediated blaNDM-5 was in a genetic context nearly identical to that of the GenBank entry of an IncX3 blaNDM-5 plasmid previously reported from India (Klebsiella pneumoniae MGR-K194).
2015: Genome Announcements
Jatan Bahadur Sherchan, Kayoko Hayakawa, Tohru Miyoshi-Akiyama, Norio Ohmagari, Teruo Kirikae, Maki Nagamatsu, Masayoshi Tojo, Hiroshi Ohara, Jeevan B Sherchand, Sarmila Tandukar
Recently, CTX-M-type extended-spectrum-β-lactamase (ESBL)-producing Escherichia coli strains have emerged worldwide. In particular, E. coli with O antigen type 25 (O25) and sequence type 131 (ST131), which is often associated with the CTX-M-15 ESBL, has been increasingly reported globally; however, epidemiology reports on ESBL-producing E. coli in Asia are limited. Patients with clinical isolates of ESBL-producing E. coli in the Tribhuvan University teaching hospital in Kathmandu, Nepal, were included in this study...
2015: Antimicrobial Agents and Chemotherapy
Sheng-Yuan Zhao, Yan-Chun Wang, Shu-Zhen Xiao, Xiao-Fei Jiang, Xiao-Kui Guo, Yu-Xing Ni, Li-Zhong Han
BACKGROUND: Prevention and management of Escherichia coli bloodstream infections (EC-BSIs) have become increasingly complicated by antimicrobial resistance and rapid dissemination. We investigated the antimicrobial epidemiology and phylogenetic background of clinical E. coli isolates from patients with bloodstream infections in Shanghai from 2011 to 2013. METHODS: Escherichia coli isolates causing bloodstream infections were consecutively collected between June 2011 and June 2013...
May 2015: Infectious Diseases
SiYu Guo, David Wakeham, Huub J M Brouwers, Rowland N Cobbold, Sam Abraham, Joanne L Mollinger, James R Johnson, Toni A Chapman, David M Gordon, Vanessa R Barrs, Darren J Trott
Phylogenetic group D extraintestinal pathogenic Escherichia coli (ExPEC), including O15:K52:H1 and clonal group A, have spread globally and become fluoroquinolone-resistant. Here we investigated the role of canine feces as a reservoir of these (and other) human-associated ExPEC and their potential as canine pathogens. We characterized and compared fluoroquinolone-resistant E. coli isolates originally identified as phylogenetic group D from either the feces of hospitalized dogs (n = 67; 14 dogs) or extraintestinal infections (n = 53; 33 dogs)...
April 2015: Microbes and Infection
Yasutaka Mizuno, Tetsuo Yamaguchi, Tetsuya Matsumoto
We report a first identification case of an Escherichia coli ST648 isolate producing a variant New Delhi metallo-β-lactamase (NDM) -7 in Japan, which was recovered from a patient hospitalized in India. Although the first isolate, NDM-1, was identified in Japan in 2010, NDM-producing bacteria have only been isolated from seven patients to date, and no other variant of NDM producing organism has been reported yet. The emergence of NDM variants in Enterobacteriaceae is of great concern, and the use of rigorous screening tests and preventive measures against infection is imperative...
December 2014: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
Renato Pariz Maluta, Catherine Mary Logue, Monique Ribeiro Tiba Casas, Ting Meng, Elisabete Aparecida Lopes Guastalli, Thaís Cabrera Galvão Rojas, Augusto Cezar Montelli, Teruê Sadatsune, Marcelo de Carvalho Ramos, Lisa Kay Nolan, Wanderley Dias da Silveira
Avian pathogenic Escherichia coli (APEC) strains belong to a category that is associated with colibacillosis, a serious illness in the poultry industry worldwide. Additionally, some APEC groups have recently been described as potential zoonotic agents. In this work, we compared APEC strains with extraintestinal pathogenic E. coli (ExPEC) strains isolated from clinical cases of humans with extra-intestinal diseases such as urinary tract infections (UTI) and bacteremia. PCR results showed that genes usually found in the ColV plasmid (tsh, iucA, iss, and hlyF) were associated with APEC strains while fyuA, irp-2, fepC sitDchrom, fimH, crl, csgA, afa, iha, sat, hlyA, hra, cnf1, kpsMTII, clpVSakai and malX were associated with human ExPEC...
2014: PloS One
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