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https://www.readbyqxmd.com/read/28807908/activity-of-the-%C3%AE-lactamase-inhibitor-ln-1-255-against-carbapenem-hydrolyzing-class-d-%C3%AE-lactamases-from-acinetobacter-baumannii
#1
Juan Carlos Vázquez-Ucha, María Maneiro, Marta Martínez-Guitián, John Buynak, Christopher R Bethel, Robert A Bonomo, Germán Bou, Margarita Poza, Concepción González-Bello, Alejandro Beceiro
The number of infections caused by Gram-negative pathogens carrying carbapenemases is increasing, and the group of carbapenem-hydrolyzing class D β-lactamases (CHDLs) is especially problematic. Several clinically important CHDLs have been identified in A. baumannii, including OXA-23, OXA-24/40, OXA-58, OXA-143, OXA-235, and the chromosomally encoded OXA-51. The selection and dissemination of carbapenem-resistant A. baumannii strains constitutes a serious global threat. Carbapenems have been successfully utilized as last resort antibiotics for the treatment of multi-drug-resistant A...
August 14, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28803725/schistosomiasis-drugs-used-and-treatment-strategies
#2
REVIEW
Lidiany da Paixão Siqueira, Danilo Augusto Ferreira Fontesa, Cindy Siqueira Britto Aguilera, Taysa Renata Ribeiro Timoteo, Matheus Alves Angelos, Laysa Creusa Paes Barreto Barros Silva, Camila Gomes de Melo, Larissa Araújo Rolim, Rosali Maria Ferreira da Silva, Pedro José Rolim Neto
Neglected tropical diseases (NTDs) affect millions of people in different geographic regions, especially the poorest and most vulnerable. Currently NTDs are prevalent in 149 countries, seventeen of these neglected tropical parasitic diseases are classified as endemic. One of the most important of these diseases is schistosomiasis, also known as bilharzia, a disease caused by the genus Schistosoma. It presents several species, such as S. haematobium, S. japonicum and S. mansoni, the latter being responsible for parasitosis in Brazil...
August 10, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28782646/%C3%AE-lacta-%C3%A2-test-performance-for-detection-of-extended-spectrum-%C3%AE-lactamase-producing-gram-negative-bacilli-directly-on-bronchial-aspirates-samples-a-validation-study
#3
Salah Gallah, Yahia Benzarara, Jacques Tankovic, Paul-Louis Woerther, Hayat Bensekri, Jean-Luc Mainardi, Guillaume Arlet, Sophie Vimont, Marc Garnier
OBJECTIVES: Incidence of Extended Spectrum β-Lactamase-producing Gram Negative Bacilli (ESBL-P-GNB)-related infections is worryingly increasing worldwide. ESBL-P-GNB detection directly on bronchial aspirate samples (BAS) performed for suspected pneumonia may help save empirical carbapenems. Our objectives were to optimize β-LACTA(®) test (BLT) realization and evaluate BLT performance for ESBL-P-GNB detection directly on BAS. METHODS: 1) BLT technical optimization using BAS of different matrix types spiked with increasing concentrations of CTX-M-15-producing Klebsiella pneumoniae; 2) in vitro validation of BLT diagnostic performance on 17 ESBL enzymes, belonging to CTX-M, SHV, TEM, OXA, GES, VEB, and PER groups; 3) clinical validation of BLT performance on 126 BAS prospectively collected from 7 Intensive Care Units...
August 3, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28780361/untreated-urban-waste-contaminates-indian-river-sediments-with-resistance-genes-to-last-resort-antibiotics
#4
Nachiket P Marathe, Chandan Pal, Swapnil S Gaikwad, Viktor Jonsson, Erik Kristiansson, D G Joakim Larsson
Efficient sewage treatment is critical for limiting environmental transmission of antibiotic-resistant bacteria. In many low and middle income countries, however, large proportions of sewage are still released untreated into receiving water bodies. In-depth knowledge of how such discharges of untreated urban waste influences the environmental resistome is largely lacking. Here, we highlight the impact of uncontrolled discharge of partially treated and/or untreated wastewater on the structure of bacterial communities and resistome of sediments collected from Mutha river flowing through Pune city in India...
July 25, 2017: Water Research
https://www.readbyqxmd.com/read/28777084/the-role-of-conserved-surface-hydrophobic-residues-in-the-carbapenemase-activity-of-the-class-d-%C3%AE-lactamases
#5
Marta Toth, Clyde A Smith, Nuno T Antunes, Nichole K Stewart, Lauren Maltz, Sergei B Vakulenko
Carbapenem-hydrolyzing class D β-lactamases (CHDLs) produce resistance to the last-resort carbapenem antibiotics and render these drugs ineffective for the treatment of life-threatening infections. Here, it is shown that among the clinically important CHDLs, OXA-143 produces the highest levels of resistance to carbapenems and has the highest catalytic efficiency against these substrates. Structural data demonstrate that acylated carbapenems entirely fill the active site of CHDLs, leaving no space for water molecules, including the deacylating water...
August 1, 2017: Acta Crystallographica. Section D, Structural Biology
https://www.readbyqxmd.com/read/28758635/cluster-distinguishing-genotypic-and-phenotypic-diversity-of-carbapenem-resistant-gram-negative-bacteria-in-solid-organ-transplantation-patients-a-comparative-study
#6
Theodoros Karampatakis, Anastasia Geladari, Lida Politi, Charalampos Antachopoulos, Elias Iosifidis, Olga Tsiatsiou, Aggeliki Karyoti, Vasileios Papanikolaou, Athanassios Tsakris, Emmanuel Roilides
PURPOSE: Solid-organ transplant recipients may display high rates of colonization and/or infection by multidrug-resistant bacteria. We analysed and compared the phenotypic and genotypic diversity of carbapenem-resistant (CR) strains of Klebsiella pneumoniae, Pseudomonas aeruginosa and Acinetobacter baumannii isolated from patients in the Solid Organ Transplantation department of our hospital. METHODOLOGY: Between March 2012 and August 2013, 56 CR strains from various biological fluids underwent antimicrobial susceptibility testing with VITEK 2, molecular analysis by PCR amplification and genotypic analysis with pulsed-field gel electrophoresis (PFGE)...
July 31, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28743652/molecular-epidemiology-of-carbapenem-resistant-klebsiella-pneumonia-at-a-turkish-center-is-the-increase-of-resistance-a-threat-for-europe
#7
Aslıhan Candevir Ulu, Tülin Güven Gökmen, Filiz Kibar, Behice Kurtaran, Cansu Önlen, Ferit Kuşçu, Ayşe Seza İnal, Süheyla Kömür, Akgün Yaman, Hasan Salih Zeki Aksu, Yeşim Taşova
INTRODUCTION: In recent years carbapenem resistant Klebsiella pneumoniae has became an important threat to hospitalized patients. Our aim in this study was to identify the genetic mechanisms of carbapenem resistance in our center. MATERIALS AND METHODS: In this study, a total of 98K. pneumoniae isolated from patients who registered at Cukurova University Balcali Hospital and determined phenotypically carbapenem resistant were screened for genotypic presence of carbapenemase enzymes with the multiplex-PCR in the period of 2013-2014...
July 22, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28712369/a-hospital-based-matched-case-control-study-to-identify-risk-factors-for-clinical-infection-with-oxa-48-producing-klebsiella-pneumoniae-in-rectal-carriers
#8
A Madueño, J Gonzalez Garcia, A Aguirre-Jaime, M Lecuona
Asymptomatic colonisation of the gastrointestinal tract by carbapenemase-producing Enterobacteriaceae is an important reservoir for transmission, which may precede infection. This retrospective observational case-control study was designed to identify risk factors for developing clinical infection with OXA-48-producing Klebsiella pneumoniae in rectal carriers during hospitalisation. Case patients (n = 76) had carbapenemase-producing K. pneumoniae (CPKP) infection and positive rectal culture for CPKP. Control patients (n = 174) were those with rectal colonisation with CPKP but without CPKP infection...
September 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28708476/a-long-term-study-of-the-diversity-of-oxa-48-like-carbapenemase-producing-bacterial-strains-in-infected-patients-and-carriers
#9
Paul-Louis Woerther, Taha Jardak, Inès Ben Hassine, Sébastien Forget, Elisabeth Chachaty, Guillaume Arlet, Dominique Decré
PURPOSE: Since their emergence at the beginning of the century, OXA-48 carbapenemases have spread in the community and in hospitals. To assess the diversity of OXA-48-producing bacterial strains and plasmids in the hospital setting, we studied the strains isolated from patients in three hospitals in the Paris area. MATERIALS AND METHODS: All possible OXA-48-like strains were included in the study. OXA-48-like and extended-spectrum beta-lactamase-encoding genes were identified, and fingerprinting analysis was performed for all Escherichia coli and Klebsiella pneumoniae strains...
July 14, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28700049/molecular-detection-of-%C3%AE-lactamase-and-integron-genes-in-clinical-strains-of-klebsiella-pneumoniae-by-multiplex-polymerase-chain-reaction
#10
Mansour Sedighi, Masoumeh Halajzadeh, Rashid Ramazanzadeh, Noor Amirmozafari, Mohsen Heidary, Serve Pirouzi
INTRODUCTION: Infections caused by β-lactamase-producing gram-negative bacteria, such as Klebsiella pneumoniae, are increasing globally with high morbidity and mortality. The aim of the current study was to determine antimicrobial susceptibility patterns and the prevalence of antibiotic resistance genes (β-lactamase and integron genes) using multiplex PCR. METHODS: One-hundred K. pneumoniae isolates were collected from different clinical samples. Antibiotic susceptibility testing was performed with thirteen different antibiotics...
May 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28700048/distribution-of-the-bla-oxa-bla-veb-1-and-bla-ges-1-genes-and-resistance-patterns-of-esbl-producing-pseudomonas-aeruginosa-isolated-from-hospitals-in-tehran-and-qazvin-iran
#11
Sahar Amirkamali, Taghi Naserpour-Farivar, Khadijeh Azarhoosh, Amir Peymani
INTRODUCTION: Pseudomonas aeruginosa is one of the most common nosocomial pathogens. The emergence of extended spectrum β-lactamases (ESBLs) has been increasingly reported as a major clinical concern worldwide. The main aim of the present study was to determine the distribution of bla OXA, bla PER-1, bla VEB-1, and bla GES-1 genes among ESBL-producing P. aeruginosa isolated from two distinct provinces in Iran. METHODS: In this study, a total of 75 (27.5%) ESBL-producing isolates were identified from 273 P...
May 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28693493/comparison-of-in-house-and-commercial-real-time-pcr-based-carbapenemase-gene-detection-methods-in-enterobacteriaceae-and-non-fermenting-gram-negative-bacterial-isolates
#12
M Smiljanic, M Kaase, P Ahmad-Nejad, B Ghebremedhin
BACKGROUND: Carbapenemase-producing gram-negative bacteria are increasing globally and have been associated with outbreaks in hospital settings. Thus, the accurate detection of these bacteria in infections is mandatory for administering the adequate therapy and infection control measures. This study aimed to establish and evaluate a multiplex real-time PCR assay for the simultaneous detection of carbapenemase gene variants in gram-negative rods and to compare the performance with a commercial RT-PCR assay (Check-Direct CPE)...
July 10, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28691891/incidence-of-oxa-23-and-oxa-58-carbapenemases-coexpressed-in-clinical-isolates-of-acinetobacter-baumannii-in-tunisia
#13
Najla Mathlouthi, Yomna Ben Lamine, Rania Somai, Sophia Bouhalila-Besbes, Sofiane Bakour, Jean-Marc Rolain, Chedly Chouchani
Acinetobacter baumannii is an important opportunistic and multidrug-resistant pathogen responsible for nosocomial infections in health facilities. The aim of this study was to characterize the molecular mechanisms of carbapenem resistance in A. baumannii isolates isolated from Mohamed Kassab Orthopedic Institute in Tunis, Tunisia. Twenty-five imipenem-resistant A. baumannii clinical isolates collected between 2013 and 2016 were identified using API 20NE and were confirmed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF/MS)...
July 10, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28684582/draft-genome-sequence-of-a-multidrug-resistant-sequence-type-231-outbreak-associated-clone-of-klebsiella-pneumoniae-kp41-2015-producing-oxa-232-carbapenemase
#14
M H F Abdul Momin, A Liakopoulos, D W Wareham
Carbapenem-resistant Klebsiella pneumoniae infection is a rising public health threat due to limited therapeutic options. Here, we report the genome sequence of a multidrug-resistant K. pneumoniae sequence type 231 (ST231) strain associated with an outbreak of infections in an intensive care unit that carries a unique complement of resistance determinants.
July 6, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28674059/in-vivo-emergence-of-resistance-to-novel-cephalosporin-%C3%AE-lactamase-inhibitor-combinations-through-the-duplication-of-the-amino-acid-d149-from-oxa-2-%C3%AE-lactamase-oxa-539-in-st235-pseudomonas-aeruginosa
#15
Pablo A Fraile-Ribot, Xavier Mulet, Gabriel Cabot, Ester Del Barrio-Tofiño, Carlos Juan, José L Pérez, Antonio Oliver
Resistance development to novel cephalosporin-β-lactamase inhibitor combinations during ceftazidime treatment of a surgical infection by Pseudomonas aeruginosa was investigated. Both, initial (97C2) and final (98G1) isolates, belonged to the high-risk clone ST235 and were resistant to carbapenems (oprD-), fluoroquinolones (GyrA-T83I, ParC-S87L) and aminoglycosides (aacA7/aacA8/aadA6). 98G1 additionally showed resistance to ceftazidime, ceftazidime-avibactam and ceftolozane-tazobactam. Sequencing identified blaOXA-2 in 97C2, but 98G1 contained a 3-bp insertion leading to the duplication of the key residue D149 (designated OXA-539)...
July 3, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28637339/emergence-of-ceftazidime-avibactam-non-susceptibility-in-an-mdr-klebsiella-pneumoniae-isolate
#16
Anna Both, Henning Büttner, Jiabin Huang, Markus Perbandt, Cristina Belmar Campos, Martin Christner, Florian P Maurer, Stefan Kluge, Christina König, Martin Aepfelbacher, Dominic Wichmann, Holger Rohde
Background: Avibactam is a novel broad-range β-lactamase inhibitor active against Ambler class A (including ESBL and KPC) and some Ambler class C and D (e.g. OXA-48) enzymes. We here report on the emergence of ceftazidime/avibactam resistance in clinical, multiresistant, OXA-48 and CTX-M-14-producing Klebsiella pneumoniae isolate DT12 during ceftazidime/avibactam treatment. Methods and results: Comparative whole-genome sequence analysis identified two SNPs in the CTX-M-14-encoding gene leading to two amino acid changes (P170S and T264I)...
June 16, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28614760/abundance-of-carbapenemase-genes-blakpc-blandm-and-blaoxa-48-in-wastewater-effluents-from-tunisian-hospitals
#17
Emna Nasri, Jessica Subirats, Alexandre Sànchez-Melsió, Hedi Ben Mansour, Carles M Borrego, José Luis Balcázar
Carbapenems are β-lactam antibiotics with a broad spectrum of activity and are usually considered the last resort for the treatment of severe infections caused by multidrug-resistant pathogens. The clinically most significant carbapenemases are KPC, NDM, and OXA-48-like enzymes, whose genes have been increasingly reported worldwide in members of the family Enterobacteriaceae. In this study, we quantified the abundance of these genes in wastewater effluents from different Tunisian hospitals. The blaNDM and blaOXA-48-like genes were detected at similar concentrations in all hospital wastewater effluents...
June 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28604100/molecular-epidemiology-of-carbapenem-resistant-acinetobacter-baumannii-in-greece-an-extended-review-2000-2015
#18
Theodoros Karampatakis, Charalampos Antachopoulos, Athanassios Tsakris, Emmanuel Roilides
Carbapenem-resistant Acinetobacter baumannii (CRAB) is endemic in Greece. CRAB initially emerged in 2000 and since then, carbapenemases still have a crucial role in CRAB appearance, except for a few cases resulting from efflux pump or outer-membrane protein mechanisms. OXA-type carbapenemases present the highest prevalence worldwide and bla OXA-23-like and bla OXA-58-like are the most important genes found; VIM-yielding CRAB have also been detected, while a single CRAB isolate producing NDM has quite recently emerged in Greece...
June 12, 2017: Future Microbiology
https://www.readbyqxmd.com/read/28572036/draft-genome-sequence-of-a-multidrug-resistant-oxa-23-producing-acinetobacter-baumannii-st191-clinical-isolate-from-china
#19
Juan Xu, Wenping Lin, Weixing Xi, Yingyu Yao
Acinetobacter baumannii has emerged worldwide as a dominant pathogen in nosocomial infections. In this study, we report the draft genome sequence of a clinical multidrug-resistant (MDR) A. baumannii ST191 (CC92) strain. Whole-genome sequencing of the isolate was performed using an Illumina HiSeq™ 2500 system, and bioinformatics analysis was also performed. The draft genome length was 4,259,210bp, harbouring 14 gene sequences relevant to antibiotic resistance. Antimicrobial susceptibility testing revealed that the isolate was resistant to all of the tested antibiotics except for tigecycline and colistin...
May 30, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28567057/molecular-study-of-acinetobacter-baumannii-isolates-for-metallo-%C3%AE-lactamases-and-extended-spectrum-%C3%AE-lactamases-genes-in-intensive-care-unit-mansoura-university-hospital-egypt
#20
Nashwa M Alkasaby, Maysaa El Sayed Zaki
Acinetobacter baumannii (A. baumannii) has been known as a causative pathogen of hospital acquired infections. The aim of this study is to examine the presence of A. baumannii among clinical isolates from intensive care unit (ICU) in Mansoura University Hospital (MUH), its antibiotic resistance pattern, and prevalence of antibiotic resistance genes metallo-β-lactamases (MBLs) and extended-spectrum-β-lactamases (ESBLs) among A. baumannii isolates. A. baumannii was identified by colony morphology, API 20E, and confirmed by detecting the bla OXA-51-like carbapenemase gene by PCR...
2017: International Journal of Microbiology
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