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https://www.readbyqxmd.com/read/29143727/characterization-of-clinically-isolated-thymidine-dependent-small-colony-variants-of-escherichia-coli-producing-extended-spectrum-%C3%AE-lactamase
#1
Tatsuya Negishi, Takehisa Matsumoto, Kazuki Horiuchi, Eriko Kasuga, Tatsuya Natori, Mina Matsuoka, Naoko Ogiwara, Mitsutoshi Sugano, Takeshi Uehara, Noriyuki Nagano, Takayuki Honda
PURPOSE: Thymidine-dependent small-colony variants (TD-SCVs) are difficult to detect or test for antimicrobial susceptibility. We investigated the characteristics of clonal TD-SCVs of Escherichia coli, both with and without blaCTX-M-3, isolated from a patient. METHODOLOGY: Mutation in the thyA gene was analysed by sequencing, and morphological abnormalities in the colonies and cells of the isolates were examined. Additionally, conjugational transfer experiments were performed to prove the horizontal transferability of plasmids harbouring resistance genes...
November 16, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29138113/prevalence-of-extended-spectrum-beta-lactamase-and-carbapenemase-encoding-genes-in-poultry-feces-from-algeria-and-marseille-france
#2
Chabou Selma, Leulmi Hamza, Davoust Bernard, Aouadi Atef, Jean-Marc Rolain
OBJECTIVE: The aim of this study was to evaluate the prevalence of extended-spectrum beta lactamase (ESBLs) and carbapenemase-encoding genes in poultry from Algeria and Marseille, France. MATERIALS AND METHODS: The samples consisted of feces from broilers from France and Algeria between 2014 and 2015. DNA extraction and quantitative PCR were performed on 833 fecal samples to screen for the presence of ESBLs (TEM, SHV, CTX-M) and carbapenemase-encoding genes (NDM, OXA48, OXA58)...
November 11, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29136156/increase-in-antimicrobial-resistance-and-emergence-of-major-international-high-risk-clonal-lineages-in-dogs-and-cats-with-urinary-tract-infection-16-year-retrospective-study
#3
Cátia Marques, Adriana Belas, Andreia Franco, Catarina Aboim, Luís Telo Gama, Constança Pomba
Objectives: To evaluate temporal trends in antimicrobial resistance, over 16 years, in bacteria isolated from dogs and cats with urinary tract infection (UTI) and the clonal lineages of bacteria harbouring critical antimicrobial resistance mechanisms. Methods: Antimicrobial susceptibility testing was conducted for 948 bacteria isolated from dogs and cats with UTI (1999-2014). Resistance mechanisms were detected by PCR, namely ESBL/AmpC in third-generation cephalosporin (3GC)-resistant Escherichia coli and Proteus mirabilis, mecA in methicillin-resistant staphylococci, and aac(6')-Ieaph(2″)-Ia and aph(2″)-1d in high-level gentamicin-resistant (HLGR) enterococci...
November 9, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29125052/prevalence-of-extended-spectrum-beta-lactamase-and-carbapenemase-producing-bloodstream-isolates-of-klebsiella-pneumoniae-in-a-tertiary-care-hospital
#4
Henrietta Abodakpi, Kai-Tai Chang, Ana María Sánchez Díaz, Rafael Cantón, Todd M Lasco, Katrina Chan, Amelia K Sofjan, Vincent H Tam
To improve prescribing of empiric therapy, the local molecular epidemiology of extended-spectrum beta-lactamases (ESBLs) and Klebsiella pneumoniae carbapenemases (KPCs) in bloodstream isolates of K. pneumoniae were evaluated. Isolates resistant to third generation cephalosporins were screened phenotypically for ESBLs and carbapenemases, and subsequently confirmed by PCR for the presence of ESBL (blaTEM, blaSHV and blaCTX-M) and carbapenemase (blaKPC, blaVIM, blaNDM and blaOXA-48) genes. Hydrolytic activity (functional gene expression) was quantified using a nitrocefin degradation assay and correlated to ceftazidime or meropenem MIC...
November 10, 2017: Journal of Chemotherapy
https://www.readbyqxmd.com/read/29111479/high-level-of-resistance-to-%C3%AE-lactam-and-presence-of-%C3%AE-lactamases-encoding-genes-in-ochrobactrum-sp-and-achromobacter-sp-isolated-from-soil
#5
João Pedro Rueda Furlan, Eliana Guedes Stehling
OBJECTIVES: Bacteria belonging to the genera Ochrobactrum and Achromobacter are bacteria considered opportunistic, causing infections mainly in immunocompromised patients. β-lactamases are the main cause of resistance to β-lactam antibiotics. This study aimed to investigate the antimicrobial resistance profile and the presence of β-lactamases encoding genes in Ochrobactrum sp. and Achromobacter sp. isolated from Brazilian soils. METHODS: Soil samples from the five regions of Brazil were collected for the isolation of bacteria, which were identified molecularly and then, the minimum inhibitory concentration and detection of β-lactamases encoding genes were performed...
October 31, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29109700/exploring-the-genome-and-phenotype-of-multi-drug-resistant-klebsiella-pneumoniae-of-clinical-origin
#6
João Anes, Daniel Hurley, Marta Martins, Séamus Fanning
Klebsiella pneumoniae is an important nosocomial pathogen with an extraordinary resistant phenotype due to a combination of acquired resistant-elements and efflux mechanisms. In this study a detailed molecular characterization of 11 K. pneumoniae isolates of clinical origin was carried out. Eleven clinical isolates were tested for their susceptibilities, by disk diffusion and broth microdilution and interpreted according to CLSI guidelines. Efflux activity was determined by measuring the extrusion of ethidium bromide and biofilm formation was assessed following static growth in Müeller-Hinton and minimal media M9 broths at two temperatures and time points...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29107607/emergence-and-mechanism-of-carbapenem-resistant-escherichia-coli-in-henan-china-2014
#7
Wen-Juan Liang, Hui-Ying Liu, Guang-Cai Duan, Yong-Xin Zhao, Shuai-Yin Chen, Hai-Yan Yang, Yuan-Lin Xi
The emergence and dissemination of carbapenem-resistant Escherichia coli (E. coli) strains is a main risk for global public health, but little is known of carbapenemase producing E. coli in Henan, China. The study was undertaken to investigate the prevalence and mechanism of carbapenem-resistant E. coli strains in a hospital in Xinxiang, Henan, China, 2014. A total of 5 carbapenemase-producing E. coli strains were screened from 1014 isolates. We found that they were all resistant to meropenem and imipenem. Amikacin showed the best sensitivity, with gentamicin coming up next...
October 26, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/29106538/origin-of-the-plasmid-mediated-fosfomycin-resistance-gene-fosa3
#8
Ryota Ito, Marissa P Pacey, Roberta T Mettus, Nicolas Sluis-Cremer, Yohei Doi
Background: fosA3 is the most commonly reported plasmid-mediated fosfomycin resistance gene among Enterobacteriaceae. Objectives: To identify the origin of fosA3. Methods: The chromosome of Kluyvera georgiana clinical strain YDC799 was fully sequenced with single-molecule real-time sequencing. Comparative genetic analysis was performed for K. georgiana YDC799, K. georgiana type strain ATCC 51603 and representative fosA3-carrying plasmids. fosA genes were cloned in Escherichia coli to confirm function...
November 2, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29103683/complete-genetic-analysis-of-a-salmonella-enterica-serovar-indiana-isolate-accompanying-four-plasmids-carrying-mcr-1-esbl-and-other-resistance-genes-in-china
#9
Juan Wang, Xianglei Li, Juan Li, Daniel Hurley, Xue Bai, Zhongyi Yu, Yu Cao, Ellen Wall, Séamus Fanning, Li Bai
One mcr-1-carrying Salmonella enterica serovar Indiana strain D90, was identified from 1320 Salmonella enterica isolates from poultry slaughterhouse in 2012 in China. The objective of this study was to verify the transferability of the mcr-1 gene and also completely characterize the sequence of the strain at the whole-genome level. Broth matting assays were carried out to detect the transferability and whole-genome sequencing (WGS) of S. enterica serovar Indiana D90 was performed using the PacBio RS II system...
October 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/29102775/blandm-1-producing-multidrug-resistant-escherichia-coli-isolated-from-a-companion-dog-in-china
#10
Lanqing Cui, Lei Lei, Yuan Lv, Rongmin Zhang, Xiaoyu Liu, Mei Li, Fan Zhang, Yang Wang
OBJECTIVES: This sudy aimed to characterize a blaNDM-1-producing Escherichia coli from a companion dog. METHODS: This strain was isolated from a surveillance study of carbapenem-resistant Gram-negative bacteria and the specie was identified by API 20E system and MALDI-TOF MS. MICs of various antimicrobial agents were determined by agar dilution. Multilocus sequence typing (MLST) and various carbapenemase genes including blaNDM, blaIMP, blaVIM, blaSME, blaIMI, blaKPC, blaGES, blaSPM, blaGIM, blaNMC, blaDIM, blaSIM, blaOXA-23, blaOXA-24, blaOXA-48, blaOXA-51 and blaOXA-58 were screened by PCR...
November 1, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29099753/plant-growth-antibiotic-uptake-and-prevalence-of-antibiotic-resistance-in-an-endophytic-system-of-pakchoi-under-antibiotic-exposure
#11
Hao Zhang, Xunan Li, Qingxiang Yang, Linlin Sun, Xinxin Yang, Mingming Zhou, Rongzhen Deng, Linqian Bi
Antibiotic contamination in agroecosystems may cause serious problems, such as the proliferation of various antibiotic resistant bacteria and the spreading of antibiotic resistance genes (ARGs) in the environment or even to human beings. However, it is unclear whether environmental antibiotics, antibiotic resistant bacteria, and ARGs can directly enter into, or occur in, the endophytic systems of plants exposed to pollutants. In this study, a hydroponic experiment exposing pakchoi (Brassica chinensis L.) to tetracycline, cephalexin, and sulfamethoxazole at 50% minimum inhibitory concentration (MIC) levels and MIC levels, respectively, was conducted to explore plant growth, antibiotic uptake, and the development of antibiotic resistance in endophytic systems...
November 3, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29091201/is26-mediated-formation-of-a-virulence-and-resistance-plasmid-in-salmonella-enteritidis
#12
Marcus Ho-Yin Wong, Edward Wai-Chi Chan, Sheng Chen
Objectives: To characterize a novel virulence-resistance plasmid pSE380T carried by a Salmonella enterica serotype Enteritidis clinical strain SE380. Methods: The plasmid pSE380T was conjugated to Escherichia coli strain J53 and sequenced by PacBio RSII, followed by subsequent annotation and genetic analysis. Results: Sequence analysis of this plasmid revealed that the entire Salmonella Enteritidis-specific virulence plasmid, pSEN, had been incorporated into an IncHI2 MDR plasmid, which comprises the cephalosporin and fosfomycin resistance determinants blaCTX-M-14 and fosA3...
October 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29090981/characterization-of-unexpressed-extended-spectrum-beta-lactamase-genes-in-antibiotic-sensitive-klebsiella-pneumoniae-isolates
#13
Zhao Zhang, Yao Zhai, Yatao Guo, Daixi Li, Zhanwei Wang, Jing Wang, Yusheng Chen, Qi Wang, Zhancheng Gao
OBJECTIVE: The current investigation explores whether extended-spectrum β-lactamase (ESBL) genes exist in clinical non-ESBL-producing Klebsiella pneumoniae isolates. METHODS: A total of 202 clinical isolates with non-ESBL-producing K. pneumoniae were collected from southern and middle of China. Thirteen β-lactamase genes (blaSHV, CTX-M, TEM, OXA-2, OXA-10, VEB, PER, SFO, GES, CSP, TLA, BEL, and IBC) were screened by PCR and their identity confirmed by sequencing of PCR products...
November 1, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/29081769/characterization-of-oqxab-in-escherichia-coli-isolates-from-animals-retail-meat-and-human-patients-in-guangzhou-china
#14
Jing Wang, Chan-Ping Zhi, Xiao-Jie Chen, Ze-Wen Guo, Wu-Ling Liu, Juan Luo, Xin-Yi Huang, Li Zeng, Jia-Wei Huang, Ying-Bi Xia, Meng-Ying Yi, Teng Huang, Zhen-Ling Zeng, Jian-Hua Liu
The purpose of this study was to investigate the prevalence and genetic elements of oqxAB among Escherichia coli isolates from animals, retail meat, and humans (patients with infection or colonization) in Guangzhou, China. A total of 1,354 E. coli isolates were screened for oqxAB by PCR. Fifty oqxAB-positive isolates were further characterized by pulsed-field gel electrophoresis (PFGE), multilocus sequence typing (MLST), S1-PFGE, genetic environment analysis, plasmid replicon typing, and plasmid sequencing...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29080706/performance-of-an-esbl-pcr-assay-for-rapid-and-direct-detection-of-esbl-carriage-from-rectal-swabs-and-enrichment-broth
#15
Wouter van den Bijllaardt, Marco M Janssens, Anton G Buiting, Anouk E Muller, Johan W Mouton, Jaco J Verweij
BACKGROUND: ESBL screening and contact precautions on patients at high risk for ESBL carriage are considered important infection control measures. Since contact precautions are costly and may negatively impact patient care, rapid exclusion of ESBL carriage and therefore earlier discontinuation of contact precautions are desired. AIM: In the present study, the performance of an ESBL PCR targeting blaCTX-M genes was evaluated as a screening assay for ESBL carriage...
October 25, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/29077916/comparison-of-prevalence-phenotype-and-antimicrobial-resistance-of-salmonella-serovars-isolated-from-turkeys-in-taiwan
#16
J-C Yeh, C-L Chen, C-S Chiou, D-Y Lo, J-C Cheng, H-C Kuo
Salmonella spp. is a foodborne pathogen that causes zoonotic disease worldwide. The aim of this study was to investigate the prevalence of antimicrobial resistance of Salmonella isolated from turkey farms in Taiwan. During the past 2 yr, 243 strains of Salmonella were isolated from 2,040 samples (11.9%) from turkey farms, including 32.5% (52/160) from the intestines of 12-day-old turkey poults, 14.2% (119/840) from feces collected from the turkey growing periods, and 6.9% (72/1,040) from finishing periods. S...
October 25, 2017: Poultry Science
https://www.readbyqxmd.com/read/29076938/gut-colonization-with-extended-spectrum-%C3%AE-lactamase-producing-enterobacteriaceae-may-increase-disease-activity-in-biologic-naive-outpatients-with-ulcerative-colitis-an-interim-analysis
#17
Vita Skuja, Aleksejs Derovs, Katrina Pekarska, Dace Rudzite, Elvira Lavrinovica, Linda Piekuse, Inga Kempa, Zane Straume, Jelena Eglite, Aivars Lejnieks, Angelika Krumina, Rami Eliakim
BACKGROUND: Certain Enterobacteriaceae strains have been associated with the development of ulcerative colitis (UC). Extended-spectrum β-lactamase (ESBL)-producing Enterobacteriaceae are the most commonly found multi-drug-resistant (MDR) bacteria colonizing the gut in UC patients and might trigger a more severe disease activity in UC patients. OBJECTIVE: The aim of this study was to evaluate whether disease activity is higher in UC patients with gut colonization with ESBL-producing Enterobacteriaceae...
October 25, 2017: European Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/29075329/occurrence-of-salmonella-enterica-and-escherichia-coli-in-raw-chicken-and-beef-meat-in-northern-egypt-and-dissemination-of-their-antibiotic-resistance-markers
#18
Amira A Moawad, Helmut Hotzel, Omnia Awad, Herbert Tomaso, Heinrich Neubauer, Hafez M Hafez, Hosny El-Adawy
BACKGROUND: The global incidence of foodborne infections and antibiotic resistance is recently increased and considered of public health concern. Currently, scarcely information is available on foodborne infections and ESBL associated with poultry and beef meat in Egypt. METHODS: In total, 180 chicken and beef meat samples as well as internal organs were collected from different districts in northern Egypt. The samples were investigated for the prevalence and antibiotic resistance of Salmonella enterica serovars and Escherichia coli...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/29067005/characterization-of-four-multidrug-resistance-plasmids-captured-from-the-sediments-of-an-urban-coastal-wetland
#19
Ryan T Botts, Brooke A Apffel, C J Walters, Kelly E Davidson, Ryan S Echols, Michael R Geiger, Victoria L Guzman, Victoria S Haase, Michal A Montana, Chip A La Chat, Jenna A Mielke, Kelly L Mullen, Cierra C Virtue, Celeste J Brown, Eva M Top, David E Cummings
Self-transmissible and mobilizable plasmids contribute to the emergence and spread of multidrug-resistant bacteria by enabling the horizontal transfer of acquired antibiotic resistance. The objective of this study was to capture and characterize self-transmissible and mobilizable resistance plasmids from a coastal wetland impacted by urban stormwater runoff and human wastewater during the rainy season. Four plasmids were captured, two self-transmissible and two mobilizable, using both mating and enrichment approaches...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29064348/the-activity-of-fosfomycin-against-extended-spectrum-beta-lactamase-producing-isolates-of-enterobacteriaceae-recovered-from-urinary-tract-infections-a-single-center-study-over-a-period-of-12-years
#20
Parisa Aris, Mohammad Ali Boroumand, Mohammad Rahbar, Masoumeh Douraghi
Despite global efforts to tackle resistance in extended-spectrum beta-lactamase (ESBL)-producing isolates via old antibiotics, there are limited data on the efficacy of fosfomycin-an old oral antibiotic-against Enterobacteriaceae in the Middle East. The purpose of this study was to evaluate the in vitro activity of fosfomycin against urinary ESBL-producing isolates of Enterobacteriaceae. Between 2004 and 2015, 363 isolates of ESBL-producing Enterobacteriaceae were recovered from high-risk patients suffering from cardiac disorders and were subjected to polymerase chain reaction using specific primers for the blaTEM, blaSHV, and blaCTX-M genes...
October 24, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
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