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https://www.readbyqxmd.com/read/28333332/wck-5222-cefepime-zidebactam-antimicrobial-activity-tested-against-gram-negative-organisms-producing-clinically-relevant-%C3%AE-lactamases
#1
Helio S Sader, Paul R Rhomberg, Robert K Flamm, Ronald N Jones, Mariana Castanheira
Background: Zidebactam is a β-lactam enhancer antibiotic with a dual mechanism of action involving binding to Gram-negative PBP2 and β-lactamase inhibition. Cefepime combined with zidebactam (WCK 5222) is under clinical development for treatment of Gram-negative infections. Objectives: To evaluate the in vitro activities of cefepime and zidebactam separately and combined at 1:1 and 2:1 ratios when tested against Gram-negative organisms producing the most clinically relevant β-lactamase types...
March 18, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28333330/genomic-landscape-of-extended-spectrum-%C3%AE-lactamase-resistance-in-escherichia-coli-from-an-urban-african-setting
#2
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...
March 5, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28333319/wck-4234-a-novel-diazabicyclooctane-potentiating-carbapenems-against-enterobacteriaceae-pseudomonas-and-acinetobacter-with-class-a-c-and-d-%C3%AE-lactamases
#3
Shazad Mushtaq, Anna Vickers, Neil Woodford, David M Livermore
Background: Several diazabicyclooctanes (DBOs) are under development as inhibitors of class A and C β-lactamases. Inhibition of OXA (class D) carbapenemases is variable, with those of Acinetobacter spp. remaining notably resistant. We describe a novel DBO, WCK 4234 (Wockhardt), with distinctive activity against OXA carbapenemases. Methods: MICs of imipenem and meropenem were determined by CLSI agar dilution with WCK 4234 added at 4 or 8 mg/L. Test organisms were clinical Enterobacteriaceae, Acinetobacter baumannii and Pseudomonas aeruginosa with carbapenemases or carbapenem resistance via porin loss plus AmpC or ESBL activity...
February 16, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28333298/occurrence-and-molecular-characteristics-of-esbl-ampc-producing-escherichia-coli-in-faecal-samples-from-horses-in-an-equine-clinic
#4
Ilias Apostolakos, Eelco Franz, Angela H A M van Hoek, Alice Florijn, Christiaan Veenman, Marianne M Sloet-van Oldruitenborgh-Oosterbaan, Cindy Dierikx, Engeline van Duijkeren
Objectives: To investigate the occurrence and characteristics of ESBL/AmpC-producing Escherichia coli in faecal samples from horses at one equine clinic in the Netherlands. Methods: A total of 91 horses, including residents and patients, were sampled. ESBL/AmpC-producing E. coli were identified by a combination disc diffusion test. Phylogenetic groups and MLST were determined. ESBL/AmpC genes were analysed using PCR and sequencing. Plasmids were characterized by transformation and PCR-based replicon typing...
March 13, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28331866/clinical-response-and-outcome-in-patients-with-multidrug-resistant-gram-negative-infections
#5
Masoume Malekolkottab, Lida Shojaei, Hossein Khalili, Mahsa Doomanlou
OBJECTIVE: In this study, frequency and antimicrobial sensitivity pattern of multidrug resistant (MDR) microorganisms were evaluated in a referral teaching hospital in Iran. METHODS: Patients with MDR Gram-negative pathogens were followed during the course of hospitalization. Demographic data, baseline diseases, type of biological sample, isolated microorganism, type of infection, antibiotic regimen before the availability of the culture result and change in the antibiotic regimen following receiving the antibiogram results, response to the treatment regimen, and duration of hospitalization and patient's outcome were considered variables for each recruited patient...
January 2017: Journal of Research in Pharmacy Practice
https://www.readbyqxmd.com/read/28329737/relative-strengths-and-regulation-of-different-promoter-associated-sequences-for-various-blashv-genes-and-their-relationships-to-%C3%AE-lactam-resistance
#6
Yao Zhai, Zhao Zhang, Zhanwei Wang, Yusheng Chen, Qi Wang, Yuan Lv, Jingping Yang, Tong Zhao, Yatao Guo, Zhancheng Gao
AIMS: This work investigated the relative strengths of different blaSHV promoter-associated sequences and their regulation function in blaSHV expression and β-lactam resistance. METHODS: Recombinant plasmids with the promoter-associated sequences (P-W, P-S, P-IS, and P-WPD), tac promoter, and combined fragments of promoter and blaSHV were separately constructed and transformed into Escherichia coli DH5α. The relative strengths of the promoters indicated by the intensities of green fluorescent protein and the mRNA expression levels of blaSHV were compared...
March 23, 2017: Journal of Molecular Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28328967/phenotypic-and-molecular-characterization-of-antimicrobial-resistance-in-enterobacter-spp-isolates-from-companion-animals-in-japan
#7
Kazuki Harada, Takae Shimizu, Yujiro Mukai, Ken Kuwajima, Tomomi Sato, Akari Kajino, Masaru Usui, Yutaka Tamura, Yui Kimura, Tadashi Miyamoto, Yuzo Tsuyuki, Asami Ohki, Yasushi Kataoka
The emergence of antimicrobial resistance among Enterobacter spp., including resistance to extended-spectrum cephalosporins (ESC), is of great concern in both human and veterinary medicine. In this study, we investigated the prevalence of antimicrobial resistance among 60 isolates of Enterobacter spp., including E. cloacae (n = 44), E. aerogenes (n = 10), and E. asburiae (n = 6), from clinical specimens of dogs and cats from 15 prefectures in Japan. Furthermore, we characterized the resistance mechanisms harbored by these isolates, including extended-spectrum β-lactamases (ESBLs) and plasmid-mediated quinolone resistance (PMQR); and assessed the genetic relatedness of ESC-resistant Enterobacter spp...
2017: PloS One
https://www.readbyqxmd.com/read/28323856/risk-factors-for-esbl-producing-escherichia-coli-on-pig-farms-a-longitudinal-study-in-the-context-of-reduced-use-of-antimicrobials
#8
Wietske Dohmen, Alejandro Dorado-García, Marc J M Bonten, Jaap A Wagenaar, Dik Mevius, Dick J J Heederik
The presence of extended-spectrum beta-lactamase-producing Escherichia coli (ESBL-E. coli) in food animals is a public health concern. This study aimed to determine prevalence of ESBL-E. coli on pig farms and to assess the effect of reducing veterinary antimicrobial use (AMU) and farm management practices on ESBL-E. coli occurrence on pig farms. During 2011-2013, 36 Dutch conventional pig farms participated in a longitudinal study (4 sampling times in 18 months). Rectal swabs were taken from 60 pigs per farm and pooled per 6 pigs within the same age category...
2017: PloS One
https://www.readbyqxmd.com/read/28321350/shigellosis-caused-by-ctx-m-type-esbl-producing-shigella-flexneri-in-two-siblings-of-rural-nepal-first-case-report-from-the-country
#9
Narayan Prasad Parajuli, Govardhan Joshi, Bashu Dev Pardhe, Jyotsna Shakya, Anjeela Bhetwal, Shreena Shakya, Roshan Pandit, Sumesh Shreekhanda Shrestha, Puspa Raj Khanal
Shigellosis is an acute infectious disease characterized as severe bloody diarrhea (dysentery) and is accountable for a significant burden of morbidity and mortality especially in children under the age of 5 years. Antimicrobial therapy is required in the cases of severe dysentery associated with Shigella. However, emergence of multidrug resistant (MDR) strains of Shigella spp. over the last two decades has restricted the use of common therapeutic antimicrobials. In MDR strains, the third-generation cephalosporins have been used for the treatment, but, unfortunately, emerging reports of enzyme mediated β-lactam resistance among Shigella isolates from various parts of the world have greatly compromised the therapy of pediatric dysentery...
2017: Case Reports in Infectious Diseases
https://www.readbyqxmd.com/read/28320725/occurrence-of-acquired-16s-methyltransferase-mediated-aminoglycoside-resistance-in-clinical-isolates-of-enterobacteriaceae-within-a-tertiary-referral-hospital-of-northeast-india
#10
Jayalaxmi Wangkheimayum, Deepjyoti Paul, Debadatta Dhar, Rajlakshmi Nepram, Shiela Chetri, Deepshikha Bhowmik, Atanu Chakravarty, Amitabha Bhattacharjee
Objectives: Methylation of ribosomal target leads to a high level of resistance towards the entire clinically relevant aminoglycoside antibiotics, so early detection of these resistant determinants will help to reduce the treatment failure as well as will lessen the dissemination rate. Here, we characterize different 16s methyltransferase responsible for aminoglycoside resistance and their epidemiological background in clinical isolates of enterobacteriaceae in a tertiary referral hospital of India.Methods: All aminoglycoside resistant isolates were screened for different 16s methyltransferase by PCR assay and incompatibility typing of the conjugable plasmid harboring resistant genes was determined by PCR based replicon typing...
March 20, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28320396/occurrence-of-bla-dha-1-mediated-cephalosporin-resistance-in-escherichia-coli-and-their-transcriptional-response-against-cephalosporin-stress-a-report-from-india
#11
Birson Ingti, Deepjyoti Paul, Anand Prakash Maurya, Debajyoti Bora, Debadatta Dhar Chanda, Atanu Chakravarty, Amitabha Bhattacharjee
BACKGROUND: Treatment alternatives for DHA-1 harboring strains are challenging as it confers resistance to broad spectrum cephalosporins and may further limit treatment option when expressed at higher levels. Therefore, this study was designed to know the prevalence of DHA genes and analyse the transcription level of DHA-1 against different β-lactam stress. METHODS: Screening of AmpC β-lactamase phenotypically by modified three dimensional extract method followed by Antimicrobial Susceptibility and MIC determination...
March 21, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28320357/outcome-of-neurological-early-rehabilitation-patients-carrying-multi-drug-resistant-bacteria-results-from-a-german-multi-center-study
#12
J D Rollnik, M Bertram, C Bucka, M Hartwich, M Jöbges, G Ketter, B Leineweber, M Mertl-Rötzer, D A Nowak, T Platz, K Scheidtmann, R Thomas, F von Rosen, C W Wallesch, H Woldag, P Peschel, J Mehrholz, M Pohl
BACKGROUND: Colonization or infection with multi-drug resistant (MDR) bacteria is considered detrimental to the outcome of neurological and neurosurgical early rehabilitation patients. METHODS: In a German multi-center study, 754 neurological early rehabilitation patients were enrolled and and reviewed in respect to MDR status, length of stay (LOS) and the following outcome variables: Barthel Index (BI), Early Rehabilitation Index (ERI), Glasgow Outcome Score Extended (GOSE), Coma Remission Scale (CRS), Functional Ambulation Categories (FAC)...
March 20, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28318579/antimicrobial-susceptibility-and-characterization-of-extended-spectrum-%C3%AE-lactamases-in-escherichia-coli-isolated-from-bovine-mastitic-milk-in-south-korea-from-2012-to-2015
#13
Dong-Seob Tark, Dong Chan Moon, Hee Young Kang, Su-Ran Kim, Hyang-Mi Nam, Hee-Soo Lee, Suk-Chan Jung, Suk-Kyung Lim
In this study, we aimed to assess trends in antimicrobial resistance and to investigate the characteristics of extended-spectrum β-lactamase (ESBL)-producing isolates from bovine mastitic milk from 2012 to 2015. A total of 374 Escherichia coli isolates were analyzed (154 in 2012, 113 in 2013, 76 in 2014, and 31 in 2015). No consistent trends in antimicrobial resistance of E. coli isolates occurred during the 4-yr period. The most frequently observed resistance was tetracycline (23.3%), followed by streptomycin (17...
March 16, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28315144/monitoring-antimicrobial-resistance-amr-using-cusum-control-charts
#14
L Righi, R Amarsy, M-Q Picat, M Thuillier, E Cambau, L Raskine, S Chevret, R Flicoteaux
We evaluated the use of the Cumulative Summation (CUSUM) control chart methodology for detection of an excessive increase in antimicrobial-resistant (AMR) bacteria acquisition. We used administrative, clinical and bacteriological data from all 157,570 patients hospitalized for at least 48 h from January 1, 2010 to December 31, 2015 in a 654-bed university teaching hospital in Paris, France. Monthly computed CUSUM were evaluated for the detection of out-of-control situations, defined as incidence rates of acquired AMR bacterial colonization exceeding acceptable thresholds at the hospital and ward levels (based on six selected wards) for AMR bacteria overall and Extended-spectrum beta-lactamases Enterobacteriaceae (ESBL-E) and Methicillin-resistant Staphylococcus aureus (MRSA), specifically...
March 17, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28314728/competitive-exclusion-reduces-transmission-and-excretion-of-extended-spectrum-%C3%AE-lactamase-producing-escherichia-coli-in-broilers
#15
Daniela Ceccarelli, Alieda van Essen-Zandbergen, Bregtje Smid, Kees T Veldman, Gert Jan Boender, Egil A J Fischer, Dik J Mevius, Jeanet A van der Goot
Extended-spectrum β-lactamases (ESBLs) and plasmid mediated AmpC β-lactamases (pAmpC) are enzymes able to hydrolyze a large variety of β-lactam antibiotics, including 3(rd) generation cephalosporins and monobactams. Broilers and broiler meat products can be highly contaminated with ESBL and pAmpC-producing Escherichia coli, also known as extended-spectrum cephalosporins (ESC)-resistant E. coli, and can be a source for human infections. As few data are available on interventions to reduce ESC-resistant E...
March 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28304213/characterization-of-the-genetic-environment-of-the-blaveb-4-gene-associated-with-a-transposable-region-in-a-proteus-mirabilis-clinical-isolate
#16
Paula Espinal, Elisenda Miró, Laia Ramoneda, Manel Flores, Alba Rivera, Pere Coll, Ferran Navarro
Proteus mirabilis is the second most common cause of urinary tract infections and is also an important cause of nosocomial infections. TEM-type and CTX-M-type extended-spectrum β-lactamases (ESBLs) are the most widely distributed in this bacterial species, but minor ESBLs such as the VEB-type have also been identified. The aim of this study was to analyze the genetic environment of the blaVEB-4 gene found in a P. mirabilis clinical isolate recovered in Spain. P. mirabilis N2231 showed resistance to penicillins, cephalosporins, and aminoglycosides, remaining susceptible to imipenem, cefoxitin, β-lactamases inhibitors, and quinolones...
March 17, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28298454/in-vitro-activity-of-imipenem-against-carbapenemase-positive-enterobacteriaceae-smart-global-surveillance-program-2008-2014
#17
James A Karlowsky, Sibylle H Lob, Krystyna M Kazmierczak, Robert E Badal, Katherine Young, Mary R Motyl, Daniel F Sahm
The Study for Monitoring Antimicrobial Resistance Trends (SMART) global surveillance program collected 103,960 isolates of Enterobacteriaceae from 2008 to 2014. From this isolate collection all ertapenem-non-susceptible isolates (MIC, ≥1 μg/ml; n = 3,428) and 9,371 isolates of Escherichia coli, Klebsiella pneumoniae, Klebsiella oxytoca, and Proteus mirabilis with an ertapenem-susceptible extended-spectrum β-lactamase (ESBL)-positive phenotype were assessed for the presence of common carbapenemase genes using the Check-MDR CT101 microarray (Check-Points, Wageningen, the Netherlands) and published multiplex PCR assays...
March 15, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28288860/epidemiology-of-multidrug-resistant-gram-negative-pathogens-isolated-from-ventilator-associated-pneumonia-in-icu-patients
#18
Richa Gupta, Abida Malik, Meher Rizvi, Moied Ahmed, Anuradha Singh
OBJECTIVES: Antibiotic resistance among Gram-negative pathogens isolated from ventilator-associated pneumonia (VAP) poses a grave threat in intensive care unit (ICU) patients. The aim of this study was to assess the prevalence of pathogens in ICU patients and their drug resistance profile. The prevalence of extended-spectrum β-lactamases (ESBLs), AmpC β-lactamases and metallo-β-lactamases (MBLs) was also assessed. METHODS: Tracheal aspirates were collected aseptically from 87 ICU patients between May 2012 and January 2014...
March 10, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28288577/elevated-prevalence-of-multidrug-resistant-gram-negative-organisms-in-hiv-positive-men
#19
Claudia Reinheimer, Oliver T Keppler, Christoph Stephan, Thomas A Wichelhaus, Imke Friedrichs, Volkhard A J Kempf
BACKGROUND: Routes of transmission of multidrug-resistant gram-negative organisms (MDRGN) are not completely understood. Since sexual transmission of MDRGN might represent a potential mode that has not been noticed so far, this study evaluated transmission of MDRGN in HIV positive men. METHODS: Between November 2014 and March 2016, we retrospectively investigated the MDRGN prevalence in rectal swabs of n = 109 males tested positive for HIV (HP). These findings were compared to the MDRGN prevalence in n = 109 rectal swabs in age-matched males tested negative for HIV (HN) within the same period...
March 13, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28288398/characterization-of-extended-spectrum-%C3%AE-lactamases-esbls-producing-salmonella-in-retail-raw-chicken-carcasses
#20
Jing Qiao, Qiang Zhang, Walid Q Alali, Jiawei Wang, Lingyuan Meng, Yingping Xiao, Hua Yang, Sheng Chen, Shenghui Cui, Baowei Yang
Extended-spectrum β-lactamases (ESBLs)-producing Salmonella is considered a serious concern to public health worldwide. However, limited information is available on ESBLs-producing Salmonella in retail chicken products in China. The objective of this study was to characterize ESBLs-producing Salmonella isolates from retail chickens in China. A total of 890 Salmonella isolates from retail chicken carcasses collected from 4 provinces were firstly screened for ESBLs-production phenotype via the double-disk synergy test method...
February 24, 2017: International Journal of Food Microbiology
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