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https://www.readbyqxmd.com/read/28335414/inhibition-of-listeria-monocytogenes-on-ready-to-eat-meats-using-bacteriocin-mixtures-based-on-mode-of-action
#1
Paul Priyesh Vijayakumar, Peter M Muriana
Bacteriocin-producing (Bac⁺) lactic acid bacteria (LAB) comprising selected strains of Lactobacillus curvatus, Lactococcus lactis, Pediococcus acidilactici, and Enterococcus faecium and thailandicus were examined for inhibition of Listeria monocytogenes during hotdog challenge studies. The Bac⁺ strains, or their cell-free supernatants (CFS), were grouped according to mode-of-action (MOA) as determined from prior studies. Making a mixture of as many MOAs as possible is a practical way to obtain a potent natural antimicrobial mixture to address L...
March 14, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28335205/photosensitizer-embedded-polyacrylonitrile-nanofibers-as-antimicrobial-non-woven-textile
#2
Sarah L Stanley, Frank Scholle, Jiadeng Zhu, Yao Lu, Xiangwu Zhang, Xingci Situ, Reza A Ghiladi
Toward the objective of developing platform technologies for anti-infective materials based upon photodynamic inactivation, we employed electrospinning to prepare a non-woven textile comprised of polyacrylonitrile nanofibers embedded with a porphyrin-based cationic photosensitizer; termed PAN-Por((+)). Photosensitizer loading was determined to be 34.8 nmol/mg material; with thermostability to 300 °C. Antibacterial efficacy was evaluated against four bacteria belonging to the ESKAPE family of pathogens (Staphylococcus aureus; vancomycin-resistant Enterococcus faecium; Acinetobacter baumannii; and Klebsiella pneumonia), as well as Escherichia coli...
April 20, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28333351/ecological-impact-of-ciprofloxacin-on-commensal-enterococci-in-healthy-volunteers
#3
Victoire de Lastours, Elena Maugy, Vincent Mathy, Françoise Chau, Benjamin Rossi, François Guérin, Vincent Cattoir, Bruno Fantin
Background: The ecological impact of ciprofloxacin on commensal enterococci is unknown. Methods: Forty-eight healthy volunteers received ciprofloxacin from day (D) 0 to D14; stools were collected on D7, D14 and D42. Fluoroquinolone-susceptible and -resistant enterococci (FQ-SE and FQ-RE) were detected and quantified by culture, and identified by MALDI-TOF MS. The relative abundance of FQ-RE over FQ-SE was determined. The genetic basis of fluoroquinolone resistance was deciphered by partial sequencing of gyrA and parC genes...
March 4, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28329222/effect-of-daptomycin-dose-on-the-outcome-of-vancomycin-resistant-daptomycin-susceptible-enterococcus-faecium-bacteremia
#4
Yu-Chung Chuang, Hsin-Yi Lin, Pao-Yu Chen, Chi-Ying Lin, Jann-Tay Wang, Yee-Chun Chen, Shan-Chwen Chang
Background.: Treatment options for vancomycin-resistant enterococci (VRE) bloodstream infection (BSI) are limited. Daptomycin, although not currently approved for this indication, is frequently used for the treatment of VRE-BSI. Its optimal dose still needs to be determined. Methods.: We conducted a prospective, observational, cohort study during 2010-2015. We included patients who received a daptomycin dose of ≥6 mg/kg for the treatment of VRE-BSI caused by daptomycin-susceptible VRE...
January 25, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28327357/the-ternary-complex-structure-of-d-mandelate-dehydrogenase-with-nadh-and-anilino-oxo-acetate
#5
Nayuta Furukawa, Akimasa Miyanaga, Masahiro Nakajima, Hayao Taguchi
Enterococcus faecium NAD-dependent d-mandelate dehydrogenase (D-ManDH) belongs to a ketopantoate reductase (KPR)-related D-2-hydroxyacid dehydrogenase family, and exhibits broad substrate specificity toward bulky hydrophobic 2-ketoacids, preferring C3-branched substrates. The ternary complex structure of D-ManDH with NADH and anilino(oxo)acetate (AOA) revealed that the substrate binding induces a shear motion of the N-terminal domain along the C-terminal domain, following the hinge motion induced by the NADH binding, and allows the bound NADH molecule to form favorable interactions with a 2-ketoacid substrate...
March 18, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28326840/a-new-benzophenone-glycoside-from-the-leaves-of-mitracarpus-villosus
#6
Kenneth G Ngwoke, Njideka Orame, Shuai Liu, Festus B C Okoye, Georgios Daletos, Peter Proksch
A new benzophenone glycoside, mitraphenone A (1), together with three known compounds (2-4) were isolated from the leaves of the traditionally used medicinal plant Mitracarpus villosus (Rubiaceae) collected in Nigeria. A combination of one- and two-dimensional NMR spectroscopic and mass spectrometric measurements were carried out to identify the structure of 1. All isolated compounds (1-4) were screened for their antibacterial activity against several Gram-positive and Gram-negative bacteria. Compound 1 exhibited moderate activity against Enterococcus faecium (strains ATCC 35667 and ATCC 700221) and Staphylococcus aureus ATCC 25923 with MIC values ranging from 25 to 50 μM...
March 22, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28316844/aspergillus-pericarditis-with-tamponade-in-a-renal-transplant-patient
#7
Sylvia Biso, Rapeepat Lekkham, Antoinette Climaco
Aspergillus pericarditis is a rare and life-threatening infection in immunosuppressed patients. It has nonspecific clinical manifestations that often mimic other disease entities especially in patients who have extensive comorbidities. Diagnosis is oftentimes delayed and rarely done antemortem. A high degree of suspicion in immunocompromised patients is necessary for evaluation and timely diagnosis. This is a case of Aspergillus pericarditis with cardiac tamponade in a renal transplant patient with liver cirrhosis...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28316009/safety-assessment-of-commensal-enterococci-from-dogs
#8
Ivana Kubašová, Viola Strompfová, Andrea Lauková
Enterococci form a complex, diverse, and very important group of bacteria from the technological and food safety aspect, or from the health-improving aspect as probiotics. Generally, enterococci are considered to be of low pathogenic potential, which is associated mostly with clinical strains. In these strains, production of virulence factors as well as resistance to many antimicrobial drugs could complicate treatment of nosocomial infections. Because there is a lack of information on incidence of these attributes in animal commensal enterococci, we screened 160 strains originating from feces of clinically healthy dogs in Eastern Slovakia (n = 105)...
March 18, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28303818/biofilm-formation-capability-of-enterococcal-strains-causing-urinary-tract-infection-vis-a-vis-colonisation-and-correlation-with-enterococcal-surface-protein-gene
#9
Shubha Garg, Balvinder Mohan, Neelam Taneja
BACKGROUND: Data regarding differences in biofilm formation among urinary isolates of enterococci causing nosocomial infection versus asymptomatic colonisation is lacking. Conflicting data are available for the role of enterococcal surface protein (esp) gene in the development of enterococcal biofilms. MATERIALS AND METHODS: A total of 50 (25 each of asymptomatic bacteriuria and urinary tract infection (UTI) isolates were collected from admitted patients who had nosocomial acquisition of enterococci in urine culture (≥105 cfu/ml)...
January 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28297747/enterococcus-faecium-fc-k-derived-from-kimchi-is-a-probiotc-lactic-acid-bacteria-that-shows-anti-allergic-activity
#10
Man-Kwang Rho, Young-Eun Kim, Hyun-In Rho, Tae-Rahk Kim, Yoon-Bum Kim, Won-Kyung Sung, Taw-Woo Kim, Dae-Ok Kim, Hee Kang
A rise in the occurrence of allergic diseases is attributed to the dysregulated balance of type 1/type 2 immunity, where type 2 T helper (Th2) cells predominate over type 1 T helper (Th1) cells, leading to an abnormally increased production of IgE in response to unharmful antigens. Kimchi, a traditional Korean fermented food, is a rich source of beneficial lactic acid bacteria. In this study, we investigated the ability of Enterococcus faecium FC-K derived from kimchi to induce type I immunity in the presence of Th2 polarizing conditions in vitro and in vivo...
March 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28288575/lactobacillus-derived-extracellular-vesicles-enhance-host-immune-responses-against-vancomycin-resistant-enterococci
#11
Ming Li, Kiho Lee, Min Hsu, Gerard Nau, Eleftherios Mylonakis, Bharat Ramratnam
BACKGROUND: Probiotic bacteria are known to modulate host immune responses against various pathogens. Recently, extracellular vesicles (EVs) have emerged as potentially important mediators of host-pathogen interactions. In this study, we explored the role of L. plantarum derived EVs in modulating host responses to vancomycin-resistant Enterococcus faecium (VRE) using both Caenorhabditis elegans and human cells. RESULTS: Our previous work has shown that probiotic conditioning C...
March 14, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28285496/maldi-tof-mass-spectrometry-as-a-useful-tool-for-identification-of-enterococcus-spp-from-wild-birds-and-differentiation-of-closely-related-species
#12
Dagmara Stępień-Pyśniak, Tomasz Hauschild, Paweł Różański, Agnieszka Marek
The aim of this study was to explore the accuracy and feasibility of Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) in identifying bacteria from environmental sources, as compared to rpoA gene sequencing, and to evaluate the occurrence of bacteria of the genus Enterococcus in wild birds. In addition, a phyloproteomic analysis of certain Enterococcus species with spectral relationships was performed. The enterococci were isolated from 25 species of wild birds in central Europe (Poland)...
March 13, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28284617/detection-of-novel-oxazolidinone-and-phenicol-resistance-gene-optra-in-enterococcal-isolates-from-food-animals-and-animal-carcasses
#13
Migma Dorji Tamang, Dong Chan Moon, Su-Ran Kim, Hee Young Kang, Kichan Lee, Hyang-Mi Nam, Geum-Chan Jang, Hee-Soo Lee, Suk-Chan Jung, Suk-Kyung Lim
Altogether 7720 Enterococcus faecalis and 3939 E. faecium isolated from food animals and animal carcasses during 2003-2014 in Korea were investigated to determine if linezolid-resistant (LR) enterococci (≥8μg/ml) are present. Overall, 12 E. faecalis and 27 E. faecium recovered from chickens (n=32), pigs (n=6), and cattle (n=1) were resistant to linezolid and were further characterized using molecular methods Most LR isolates were also resistant to chloramphenicol (97.44%) and florfenicol (92.31%). Molecular analysis showed no mutations in the 23S ribosomal RNA and in the ribosomal protein L3...
March 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28280791/microbiological-and-biochemical-aspects-of-inland-pecorino-abruzzese-cheese
#14
Valeria Centi, Federica Matteucci, Aldo Lepidi, Maddalena Del Gallo, Claudia Ercole
Little is known on physicochemical and biochemical characteristics of "Pecorino" Abruzzese cheese in L'Aquila province, an artisanal cheese produced from ewe raw full-cream milk. Three batches of inland "Pecorino" Abruzzese cheese were examined for microbiological, compositional, biochemical and sensory characteristics at the aim of isolating and storing in a bacterial collection, indigenous strain to preserve the microbial biodiversity present in this cheese, to a possible definition of a PDO. Cheese samples from three dairies, at different stages of production were collected and 148 colonies were characterized...
February 2017: Heliyon
https://www.readbyqxmd.com/read/28276797/old-enemies-in-new-disguises-emergence-of-enterococcus-faecium-as-a-significant-clinical-problem-at-an-adult-haematology-ward
#15
Sari Hämäläinen, Jaana Pentikäinen, Jori Reijula, Ella Mauranen, Irma Koivula, Laura Lindholm, Auni Juutilainen, Tapio Nousiainen, Marja Pyörälä, Jaana Vuopio, Esa Jantunen
No abstract text is available yet for this article.
March 3, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28273381/role-of-combination-antimicrobial-therapy-for-vancomycin-resistant-enterococcus-faecium-infections-review-of-the-current-evidence
#16
Juwon Yim, Jordan R Smith, Michael J Rybak
Enterococcus species are the second most common cause of nosocomial infections in the United States and are particularly concerning in critically ill patients with preexisting comorbid conditions. Rising resistance to antimicrobials that were historically used as front-line agents for treatment of enterococcal infections, such as ampicillin, vancomycin, and aminoglycosides, further complicates the treatment of these infections. Of particular concern are Enterococcus faecium strains that are associated with the highest rate of vancomycin resistance...
March 8, 2017: Pharmacotherapy
https://www.readbyqxmd.com/read/28270110/comparative-genomics-of-enterococcus-spp-isolated-from-bovine-feces
#17
Alicia G Beukers, Rahat Zaheer, Noriko Goji, Kingsley K Amoako, Alexandre V Chaves, Michael P Ward, Tim A McAllister
BACKGROUND: Enterococcus is ubiquitous in nature and is a commensal of both the bovine and human gastrointestinal (GI) tract. It is also associated with clinical infections in humans. Subtherapeutic administration of antibiotics to cattle selects for antibiotic resistant enterococci in the bovine GI tract. Antibiotic resistance genes (ARGs) may be present in enterococci following antibiotic use in cattle. If located on mobile genetic elements (MGEs) their dissemination between Enterococcus species and to pathogenic bacteria may be promoted, reducing the efficacy of antibiotics...
March 8, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28267763/molecular-characterization-of-vancomycin-resistant-enterococcus-faecium-isolates-from-bermuda
#18
Patrick Eberechi Akpaka, Shivnarine Kissoon, Clyde Wilson, Padman Jayaratne, Ashley Smith, George R Golding
Molecular characteristics of vancomycin resistant enterococci isolates from Bermuda Island is currently unknown. This study was conducted to investigate phenotypic and genotypic characteristics of VRE isolates from Bermuda Island using the chromogenic agar, E-tests, polymerase chain reaction (PCR), pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST). Eighteen E. faecium isolates were completely analyzed and were all resistant to vancomycin, susceptible to linezolid and quinupristin/dalfopristin, positive for vanA and esp genes...
2017: PloS One
https://www.readbyqxmd.com/read/28265870/correlation-between-antibiotic-consumption-and-resistance-of-bloodstream-bacteria-in-a-university-hospital-in-north-eastern-italy-2008-2014
#19
Marta Mascarello, Omar Simonetti, Anna Knezevich, Ludovica Ilaria Carniel, Jacopo Monticelli, Marina Busetti, Paolo Schincariol, Lucio Torelli, Roberto Luzzati
PURPOSE: The spread of multidrug-resistant bacteria is a worrisome problem worldwide. This study investigated the correlation between antibiotic consumption and antimicrobial resistance trends of the most important bacteria causing bacteremia at the University hospital of Trieste, Italy, from 2008 to 2014. METHODS: Antibiotic consumption (Defined Daily Dose-DDD-per 100 patient/days) and antibiotic resistance (percentage of antibiotic intermediate o resistant isolates) were analyzed independently with linear correlation by year...
March 6, 2017: Infection
https://www.readbyqxmd.com/read/28264856/effect-of-continuous-and-sequential-therapy-among-veterans-receiving-daptomycin-or-linezolid-for-vancomycin-resistant-enterococcus-faecium-bacteremia
#20
Nicholas S Britt, Emily M Potter, Nimish Patel, Molly E Steed
Vancomycin-resistant Enterococcus faecium bloodstream infections (VREF-BSI) cause significant mortality, highlighting the need to optimize treatment. We compared the effectiveness and safety of daptomycin (DAP) and linezolid (LZD) as continuous or sequential therapy for VREF-BSI in a national, retrospective, propensity score (PS) matched cohort study of hospitalized Veterans Affairs patients (2004-2014). We compared clinical outcomes and adverse events among patients treated with continuous LZD, continuous DAP, or sequential LZD followed by DAP (LZD-DAP)...
March 6, 2017: Antimicrobial Agents and Chemotherapy
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