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https://www.readbyqxmd.com/read/28099062/rectal-carriage-of-extended-spectrum-beta-lactamase-and-carbapenemase-producing-gram-negative-bacilli-in-intensive-care-units-in-tunisia
#1
Samia Hammami, Chaima Dahdeh, Kelthoum Mamlouk, Sana Ferjeni, Elaa Maamar, Zeineb Hamzaoui, Mabrouka Saidani, Salma Ghedira, Mohamed Houissa, Amin Slim, Ilhem Boutiba-Ben Boubaker
This study was conducted to evaluate the rate of fecal carriage of Gram-negative bacilli (GNB) resistant to third-generation cephalosporins (third GC) in patients hospitalized in the intensive care unit (ICU) of Charles Nicolle Hospital of Tunis and to identify the enzymatic mechanisms involved. From February to April 2014, rectal swabs were collected from all patients (n = 38) at admission and once weekly thereafter to identify acquisition. They were cultured on desoxycholate-lactose-agar plates supplemented with cefotaxime (2 mg/L)...
January 18, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28095794/development-of-an-algorithm-for-phenotypic-screening-of-carbapenemase-producing-enterobacteriaceae-in-the-routine-laboratory
#2
Jérôme Robert, Alix Pantel, Audrey Merens, Elodie Meiller, Jean-Philippe Lavigne, Marie-Hélène Nicolas-Chanoine
BACKGROUND: Carbapenemase-producing Enterobacteriaceae (CPE) are difficult to identify among carbapenem non-susceptible Enterobacteriaceae (NSE). We designed phenotypic strategies giving priority to high sensitivity for screening putative CPE before further testing. METHODS: Presence of carbapenemase-encoding genes in ertapenem NSE (MIC > 0.5 mg/l) consecutively isolated in 80 French laboratories between November 2011 and April 2012 was determined by the Check-MDR-CT103 array method...
January 17, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28080212/heterogeneity-of-carbapenem-resistance-mechanisms-among-gram-negative-pathogens-in-lebanon-results-of-the-first-cross-sectional-countrywide-study
#3
Dalal Hammoudi Halat, Carole Ayoub Moubareck, Dolla Karam Sarkis
Carbapenem-resistant Gram-negative pathogens have progressively disseminated to different countries worldwide, presenting a serious public health concern. The aims of this study were to determine the prevalence of carbapenem resistance in Gram-negative bacteria in Lebanon, to elucidate molecular mechanisms, and to identify genetic relatedness of incriminated strains. Carbapenem nonsusceptible Enterobacteriaceae, Acinetobacter baumannii, and Pseudomonas were collected from 11 Lebanese hospitals in 2012. Antimicrobial susceptibility was assessed with phenotypic tests, genes encoding carbapenemases were screened via PCR-sequencing, and genetic relatedness was examined by PGFE and ERIC-PCR...
January 12, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28067350/enzyme-responsive-reporter-molecules-for-selective-localization-and-fluorescence-imaging-of-pathogenic-biofilms
#4
Junxin Aw, Frances Widjaja, Yichen Ding, Jing Mu, Yang Liang, Bengang Xing
Pathogenic bacteria and their biofilm formation are responsible for a broad spectrum of microbial infections. A novel enzyme-responsive reporter molecule (ERM-1), which can specifically recognize AmpC β-lactamase (Bla) in drug resistant bacteria, has been developed to enable the selective localization of biofilms.
January 9, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28061869/clinical-and-microbiologic-characteristics-of-cefotaxime-non-susceptible-enterobacteriaceae-bacteremia-a-case-control-study
#5
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
#6
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/28056081/comparative-exposure-assessment-of-esbl-producing-escherichia-coli-through-meat-consumption
#7
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/28039276/the-pharmacodynamics-of-avibactam-in-combination-with-ceftaroline-or-ceftazidime-against-%C3%AE-lactamase-producing-enterobacteriaceae-studied-in-an-in-vitro-model-of-infection
#8
Alasdair MacGowan, Sharon Tomaselli, Alan Noel, Karen Bowker
OBJECTIVES: Pharmacodynamics of β-lactamase inhibitors are an area of intense interest as new β-lactam/β-lactamase inhibitor combinations enter clinical development and clinical practice. Avibactam, a non-β-lactam β-lactamase inhibitor, has been combined with ceftaroline or ceftazidime but these two combinations have not been directly compared. METHODS: Using an in vitro pharmacokinetic model we simulated human drug concentration-time courses associated with ceftaroline 600 mg every 8 h and ceftazidime 2000 mg every 8 h...
December 30, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28034519/treatment-outcomes-in-infections-caused-by-spice-serratia-pseudomonas-indole-positive-proteus-citrobacter-and-enterobacter-organisms-carbapenem-versus-noncarbapenem-regimens
#9
Stanley Moy, Roopali Sharma
PURPOSE: Techniques used to identify AmpC β-lactamases in SPICE (Serratia, Pseudomonas, indole-positive Proteus, Citrobacter, and Enterobacter) organisms are not yet optimized for the clinical laboratory and are not routinely used. Clinicians are often left with an uncertainty on the choice of antibiotic when a SPICE organism is isolated. The purpose of this study was to evaluate the outcomes of carbapenem versus noncarbapenem regimens in treating bacteremia or urinary tract infection from a SPICE organism in clinical practice...
December 26, 2016: Clinical Therapeutics
https://www.readbyqxmd.com/read/28018582/carriage-of-esbl-ampc-producing-or-ciprofloxacin-non-susceptible-escherichia-coli-and-klebsiella-spp-in-healthy-people-in-norway
#10
Charlotte R Ulstad, Margrete Solheim, Sophie Berg, Morten Lindbæk, Ulf R Dahle, Astrid L Wester
BACKGROUND: Asymptomatic carriage has been recognised as an important risk factor for infection caused by antibiotic resistant bacteria. A 14% global prevalence of Extended-Spectrum Beta-lactamase (ESBL) carriage was recently reported, but large intra-and interregional variations were observed. We investigated the faecal carriage rates of ESBL-, AmpC-producing and ciprofloxacin non-susceptible Escherichia coli and Klebsiella spp. in healthy Norwegians. METHODS: Rectal samples were obtained from 284 volunteers, together with demographic data and information on recent travel history...
2016: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28012421/distribution-of-tetracycline-resistance-genes-and-ampc-%C3%AE-lactamase-genes-in-representative-non-urban-sewage-plants-and-correlations-with-treatment-processes-and-heavy-metals
#11
Yan-Bin Xu, Mao-Yu Hou, Ya-Fei Li, Lu Huang, Jing-Jing Ruan, Li Zheng, Qing-Xia Qiao, Qing-Ping Du
The mixed development of livestock breeding and industry in non-urban zones is a very general phenomenon in China. Distribution of antibiotic resistance genes (ARGs) in non-urban sewage treatment systems has not been paid enough attentions. In this study, eleven tetracycline resistance genes (tetA, tetB, tetC, tetE, tetG, tetL, tetM, tetO, tetQ, tetS and tetX), four AmpC β-lactamase genes (EBC, MOX, FOX and CIT) and four heavy metals (Cu, Zn, Cd and Pb) were detected and analyzed in four non-urban sewage plants with different sewage sources and different treatment processes in Guangzhou...
December 9, 2016: Chemosphere
https://www.readbyqxmd.com/read/28007519/genetic-characterisation-of-carbapenem-resistant-gram-negative-bacteria-isolated-from-the-university-hospital-mohamed-boudiaf-in-ouargla-southern-algeria
#12
Mounira Yagoubat, Aminata Ould El-Hadj-Khelil, Ali Malki, Sofiane Bakour, Abdelaziz Touati, Jean-Marc Rolain
OBJECTIVES: The aim of this study was to investigate the molecular epidemiology and the genetic support of carbapenem-resistant Enterobacteriaceae and Acinetobacter spp. isolates collected in the University Hospital of Ouargla, southern Algeria. METHODS: A total of 99 Gram-negative bacteria (GNB) were collected from stool samples of colonised patients and from inanimate surfaces in the hospital environment between December 2014 and August 2015. Selected Enterobacteriaceae and Acinetobacter spp...
December 19, 2016: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/27999441/in-vitro-and-in-vivo-activities-of-the-diazabicyclooctane-op0595-against-ampc-derepressed-pseudomonas-aeruginosa
#13
Akihiro Morinaka, Yuko Tsutsumi, Keiko Yamada, Yoshihiro Takayama, Shiro Sakakibara, Toshihiko Takata, Takao Abe, Takeshi Furuuchi, Seiichi Inamura, Yoshiaki Sakamaki, Nakako Tsujii, Takashi Ida
Pseudomonas aeruginosa is a common cause for healthcare-associated infections, which have been historically treated by antipseudomonal β-lactam agents in the clinical setting. However, P. aeruginosa has evolved to overcome these β-lactam agents via multiple endogenous resistance mechanisms, including derepression of the chromosomal cephalosporinase (AmpC). In this article, we investigated the effective concentration of OP0595 for combination with piperacillin, cefepime or meropenem in in vitro susceptibility tests, and the antibacterial activity of cefepime in combination with OP0595 in both in vitro time-kill studies and in vivo murine thigh infection model study with AmpC-derepressed P...
December 21, 2016: Journal of Antibiotics
https://www.readbyqxmd.com/read/27999057/structural-and-mechanistic-insights-into-the-inhibition-of-class-c-%C3%AE-lactamases-through-the-adenylylation-of-the-nucleophilic-serine
#14
Min-Kyu Kim, Young Jun An, Jung-Hyun Na, Jae-Hee Seol, Ju Yeon Ryu, Jin-Won Lee, Lin-Woo Kang, Kyung Min Chung, Jung-Hyun Lee, Jeong Hee Moon, Jong Seok Lee, Sun-Shin Cha
OBJECTIVES: Investigation into the adenylylation of the nucleophilic serine in AmpC BER and CMY-10 extended-spectrum class C β-lactamases. METHODS: The formation and the stability of the adenylate adduct were examined by X-ray crystallography and MS. Inhibition assays for kinetic parameters were performed by monitoring the hydrolytic activity of AmpC BER and CMY-10 using nitrocefin as a reporter substrate. The effect of adenosine 5'-(P-acetyl)monophosphate (acAMP) on the MIC of ceftazidime was tested with four Gram-negative clinical isolates...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27999022/synergistic-activity-of-fosfomycin-%C3%AE-lactams-and-peptidoglycan-recycling-inhibition-against-pseudomonas-aeruginosa
#15
Myriam Hamou-Segarra, Laura Zamorano, Grishma Vadlamani, Mitchell Chu, Irina Sanchez-Diener, Carlos Juan, Jesús Blazquez, Mitchell Hattie, Keith A Stubbs, Brian L Mark, Antonio Oliver
OBJECTIVES: To evaluate the interconnection between peptidoglycan (PG) recycling, fosfomycin susceptibility and synergy between fosfomycin and β-lactams in Pseudomonas aeruginosa METHODS: Fosfomycin MICs were determined by broth microdilution and Etest for a panel of 47 PAO1 mutants defective in several components of PG recycling and/or AmpC induction pathways. PAO1 fosfomycin MICs were also determined in the presence of a 5 mM concentration of the NagZ inhibitor PUGNAc. Population analysis of fosfomycin susceptibility and characterization of the resistant mutants that emerged was also performed for selected strains...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27988924/successful-eradication-therapy-for-helicobacter-pylori-positive-atrophic-gastritis-at-the-sixth-attempt-a-case-report
#16
Ryuzo Deguchi, Koichi Shiraishi, Yoshitaka Arase, Makiko Dekiden, Hideo Shimada, Hiroshi Miyakita, Takashi Ogimi, Kazunori Myojin, Tetsuya Mine
A 74-year-old woman undergoing outpatient follow-up for reflux esophagitis and atrophic gastritis tested positive for Helicobacter pylori and underwent primary eradication therapy with lansoprazole (LPZ) 30 mg, amoxicillin (AMPC) 750 mg, and clarithromycin (CAM) 200 mg twice daily for 1 week in August 2012. A urea breath test (UBT) after this treatment revealed that eradication had failed. Secondary eradication therapy was carried out with esomeprazole (EPZ) 20 mg, AMPC 750 mg, and metronidazole (MNZ) 250 mg twice daily for 1 week, but this also failed...
December 20, 2016: Tokai Journal of Experimental and Clinical Medicine
https://www.readbyqxmd.com/read/27973988/characterisation-of-extended-spectrum-%C3%AE-lactamase-and-ampc-%C3%AE-lactamase-producing-enterobacteriaceae-isolated-from-companion-animals-in-new-zealand
#17
A Karkaba, A Grinberg, J Benschop, E Pleydell
AIMS: To assess the occurrence of, and characterise, extended-spectrum-β-lactamase (ESBL) and AmpC-β-lactamase (AmpC)-producing Enterobacteriaceae isolated by veterinary diagnostic laboratories from infection sites in companion animals in New Zealand. METHODS: Selected Enterobacteriaceae isolates were submitted by seven New Zealand veterinary diagnostic laboratories. They were isolated from infection sites in companion animals between June 2012 and June 2013, and were resistant to amoxicillin-clavulanic acid, fluoroquinolones, or any combination of two or more antimicrobials...
December 14, 2016: New Zealand Veterinary Journal
https://www.readbyqxmd.com/read/27964935/molecular-and-in-silico-analysis-of-a-new-plasmid-mediated-ampc-%C3%AE-lactamase-cmh-2-in-clinical-isolates-of-klebsiella-pneumoniae
#18
Birson Ingti, Monjur Ahmed Laskar, Sudip Choudhury, Anand Prakash Maurya, Deepjyoti Paul, Anupam Das Talukdar, Manabendra Dutta Choudhury, Debadatta Dhar, Atanu Chakravarty, Amitabha Bhattacharjee
Two Klebsiella strains isolated from urine samples were positive for blaAmpC by PCR and showed sequence similarity with CMH-1 (98.6%) after sequencing. It also shares 82% similarity with ACT-1, 85% with MIR-1 and 81% with the chromosomal AmpC gene of Enterobacter cloacae. This gene was associated with the plasmid of IncK type. It has an open reading frame of 381 amino acid with four amino acid substitutions at position D144A, C189R, Q192E, and A195T as compared to CMH-1. When expressed in E.coli DH5α and E...
December 10, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27959942/structure-function-analysis-of-the-transmembrane-protein-ampg-from-pseudomonas-aeruginosa
#19
Peizhen Li, Jun Ying, Guangjian Yang, Aifang Li, Jian Wang, Junwan Lu, Junrong Wang, Teng Xu, Huiguang Yi, Kewei Li, Shouguang Jin, Qiyu Bao, Kaibo Zhang
AmpG is a transmembrane protein with permease activity that transports meuropeptide from the periplasm to the cytoplasm, which is essential for the induction of the ampC encoding β-lactamase. To obtain new insights into the relationship between AmpG structure and function, comparative genomics analysis, secondary and tertiary structure modeling, site-directed mutational analyses and genetic complementation experiments were performed in this study. AmpGs from different genera of bacteria (Escherichia coli, Vibrio cholerae and Acinetobacter baumannii) could complement AmpG function in Pseudomonas aeruginosa...
2016: PloS One
https://www.readbyqxmd.com/read/27942365/isolation-antimicrobial-susceptibility-profile-and-detection-of-sul1-blatem-and-blashv-in-amoxicillin-clavulanate-resistant-bacteria-isolated-from-retail-sausages-in-kampar-malaysia
#20
Lih-Shin Tew, Li-Yen She, Choy-Hoong Chew
BACKGROUND: Due to the overuse of antibiotics in livestock as a growth-promoting agent, the emergence of multi-antibiotic resistant bacteria is becoming a concern. OBJECTIVES: In this study, we aimed to detect the presence and discover the molecular determinants of foodborne bacteria in retail sausages resistant towards the antibacterial agent amoxicillin-clavulanate. METHODS: Two grams of sausages were chopped into small pieces and transferred into sterile Luria-Bertani (LB) enrichment broths overnight before they were plated on MacConkey agar petri dishes...
October 2016: Jundishapur Journal of Microbiology
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