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https://www.readbyqxmd.com/read/28643674/microbiological-and-serological-control-of-escherichia-coli-o157-h7-in-kindergarten-staff-in-buenos-aires-city-and-suburban-areas
#1
Romina J Fernández-Brando, María Marta Amaral, Andrés E Ciocchini, Leticia V Bentancor, Jorge A Trelles, Marcelo Da Rocha, Martín Landriel, Mariana Ugarte, Gabriel Briones, Cristina Ibarra, Marina S Palermo
Shiga toxin (Stx)-producing Escherichia coli (STEC) infections are implicated in the development of the life-threatening hemolytic-uremic syndrome (HUS). Despite the magnitude of the social and economic problems caused by HUS, no licensed vaccine or effective therapy is currently available for human use. Prevention of STEC infections continues being the most important measure to reduce HUS incidence. This is especially true for Argentina where HUS incidence among children is extremely high and shows an endemic pattern...
2017: Medicina
https://www.readbyqxmd.com/read/28636835/use-of-bacteriophages-to-control-escherichia-coli-o157-h7-in-domestic-ruminants-meat-products-and-fruits-and-vegetables
#2
Lili Wang, Kunli Qu, Xiaoyu Li, Zhenhui Cao, Xitao Wang, Zhen Li, Yaxiong Song, Yongping Xu
Escherichia coli O157:H7 is an important foodborne pathogen that causes severe bloody diarrhea, hemorrhagic colitis, and hemolytic uremic syndrome. Ruminant manure is a primary source of E. coli O157:H7 contaminating the environment and food sources. Therefore, effective interventions targeted at reducing the prevalence of fecal excretion of E. coli O157:H7 by cattle and sheep and the elimination of E. coli O157:H7 contamination of meat products as well as fruits and vegetables are required. Bacteriophages offer the prospect of sustainable alternative approaches against bacterial pathogens with the flexibility of being applied therapeutically or for biological control purposes...
June 21, 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28636319/green-catanionic-gemini-surfactant-lichenysin-mixture-improved-surface-antimicrobial-and-physiological-properties
#3
Albert Ruiz, Aurora Pinazo, Lourdes Pérez, Angeles Manresa, Ana M M Marqués
Catanionic surfactant mixtures form a wide variety of organized assemblies and aggregates with improved physicochemical and biological properties. The green catanionic mixture C3(CA)2:lichenysin (molar ratio 8:2) showed antimicrobial synergies against Yersinia enterocolitica, Bacillus subtilis, Escherichia coli O157:H7 and Candida albicans. Flow cytometry and viability studies indicated that this catanionic mixture increases the probability of Y. enterocolitica (38.2%) and B. subtilis (17.1%) cells entering a viable but nonculturable state...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28635589/regulation-of-escherichia-coli-pathogenesis-by-alternative-sigma-factor-n
#4
James T Riordan, Avishek Mitra
σ(N) (also σ(54)) is an alternative sigma factor subunit of the RNA polymerase complex that regulates the expression of genes from many different ontological groups. It is broadly conserved in the Eubacteria with major roles in nitrogen metabolism, membrane biogenesis, and motility. σ(N) is encoded as the first gene of a five-gene operon including rpoN (σ(N)), ptsN, hpf, rapZ, and npr that has been genetically retained among species of Escherichia, Shigella, and Salmonella. In an increasing number of bacteria, σ(N) has been implicated in the control of genes essential to pathogenic behavior, including those involved in adherence, secretion, immune subversion, biofilm formation, toxin production, and resistance to both antimicrobials and biological stressors...
June 2017: EcoSal Plus
https://www.readbyqxmd.com/read/28630857/effectiveness-of-a-commercial-lactic-acid-bacteria-intervention-applied-to-inhibit-shiga-toxin-producing-escherichia-coli-on-refrigerated-vacuum-aged-beef
#5
Katie R Kirsch, Tamra N Tolen, Jessica C Hudson, Alejandro Castillo, Davey Griffin, T Matthew Taylor
Because of their antagonistic activity towards pathogenic and spoilage bacteria, some members of the lactic acid bacteria (LAB) have been evaluated for use as food biopreservatives. The objectives of this study were to assess the antimicrobial utility of a commercial LAB intervention against O157 and non-O157 Shiga-toxigenic E. coli (STEC) on intact beef strip loins during refrigerated vacuum aging and determine intervention efficacy as a function of mode of intervention application. Prerigor strip loins were inoculated with a cocktail (8...
2017: International journal of food science
https://www.readbyqxmd.com/read/28630239/an-unusual-case-of-escherichia-coli-o157-h7-infection-with-pseudomembranous-colitis-like-lesions-associated-with-haemolytic-uraemic-syndrome-and-neurological-sequelae
#6
James Kennedy, Lauren Simmonds, Robert Orme, Warren Doherty
A 75-year-old man was admitted with abdominal pain and fresh rectal bleeding. Significantly, he had no risk factors for Clostridium difficile infection. An abdominal CT demonstrated colonic thickening, and flexible sigmoidoscopy identified pseudomembranous colitis-like lesions. After initial treatment as C. difficile colitis, a stool sample revealed Escherichia coli O157:H7 infection. Antibiotic therapy was stopped due to the risk of lysis-mediated toxin release, but unfortunately, the patient continued to deteriorate...
June 18, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28630074/the-enterohaemorrhagic-escherichia-coli-effector-espw-triggers-actin-remodeling-in-a-rac1-dependent-manner
#7
Pamela Sandu, Valerie F Crepin, Hauke Drechsler, Andrew D McAinsh, Gad Frankel, Cedric N Berger
Enterohaemorrhagic Escherichia coli (EHEC) is a diarrheagenic pathogen that colonizes the gut mucosa and induces attaching-and-effacing lesions. EHEC employs a type III secretion system (T3SS) to translocate 50 effector proteins that hijack and manipulate host cell signalling pathways, which allow bacterial colonization, subversion of immune responses and disease progression. The aim of this study was to characterize the T3SS effector EspW. We found espW in the sequenced O157:H7 and non-O157 EHEC strains as well as in Shigella boydii Furthermore, a truncated version of EspW, containing the first 206 residues is present in EPEC strains belonging to serotype O55:H7...
June 19, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28628486/inactivation-of-bacterial-biofilms-by-visible-light-activated-unmodified-zno-nanorods
#8
Kristina Aponiene, Tomas Serevičius, Zivile Luksiene, Saulius Jursenas
Various zinc oxide (ZnO) nanostructures are widely used for photocatalytic antibacterial applications. Since ZnO possess a wide bandgap, it is believed that only UV light may efficiently assist bacterial inactivation and diverse crystal lattice modifications should be applied in order to narrow the bandgap for efficient visible light absorption. In this work we show that even unmodified ZnO nanorods grown by aqueous chemical growth technique were found to possess intrinsic defects which can be activated by visible light ( = 405 nm) and successfully applied for total inactivation of various highly resistant bacterial biofilms rather than more sensitive planktonic bacteria...
June 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28628436/contaminated-stream-water-as-source-for-escherichia-coli-o157-illness-in-children
#9
William S Probert, Glen M Miller, Katya E Ledin
In May 2016, an outbreak of Shiga toxin-producing Escherichia coli O157 infections occurred among children who had played in a stream flowing through a park. Analysis of E. coli isolates from the patients, stream water, and deer and coyote scat showed that feces from deer were the most likely source of contamination.
July 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28626552/a-new-microfluidic-approach-for-the-one-step-capture-amplification-and-label-free-quantification-of-bacteria-from-raw-samples
#10
Iago Pereiro, Amel Bendali, Sanae Tabnaoui, Lucile Alexandre, Jana Srbova, Zuzana Bilkova, Shane Deegan, Lokesh Joshi, Jean-Louis Viovy, Laurent Malaquin, Bruno Dupuy, Stéphanie Descroix
A microfluidic method to specifically capture and detect infectious bacteria based on immunorecognition and proliferative power is presented. It involves a microscale fluidized bed in which magnetic and drag forces are balanced to retain antibody-functionalized superparamagnetic beads in a chamber during sample perfusion. Captured cells are then cultivated in situ by infusing nutritionally-rich medium. The system was validated by the direct one-step detection of Salmonella Typhimurium in undiluted unskimmed milk, without pre-treatment...
February 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28621585/inactivation-of-nonpathogenic-escherichia-coli-escherichia-coli-o157-h7-salmonella-enterica-typhimurium-and-listeria-monocytogenes-in-ice-using-a-uvc-light-emitting-diode
#11
Suguru Murashita, Shuso Kawamura, Shigenobu Koseki
Ice, widely used in the food industry, is a potential cause of food poisoning resulting from microbial contamination. Direct microbial inactivation of ice is necessary because microorganisms may have been present in the source water used to make it and/or may have been introduced due to poor hygiene during production or handling of the ice. Nonthermal and nondestructive microbial inactivation technologies are needed to control microorganisms in ice. We evaluated the applicability of a UVC light-emitting diode (UVC-LED) for microbial inactivation in ice...
June 16, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28617525/characterization-of-high-exopolysaccharide-producing-lactobacillus-strains-isolated-from-mustard-pickles-for-potential-probiotic-applications
#12
Jing-Yao Huang, Cheng-Yen Kao, We-Sin Liu, Tony J Fang
The aim of this study was to characterize high exopolysaccharide (EPS)-producing lactic acid bacteria (LAB) isolated from mustard pickles in Taiwan for potential probiotic applications. Among 39 collected LAB strains, four most productive EPS-producing strains were selected for further analysis. Comparative analyses of 16S rDNA genes rpoA and pheS sequences demonstrated that these strains were members of Lactobacillus plantarum-group (LPG). NCD 2, NLD 4, SLC 13, and NLD 16 showed survival rates of 95.83% ± 0...
June 2017: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28614372/intestinal-organoids-model-human-responses-to-infection-by-commensal-and-shiga-toxin-producing-escherichia-coli
#13
Sayali S Karve, Suman Pradhan, Doyle V Ward, Alison A Weiss
Infection with Shiga toxin (Stx) producing Escherichia coli O157:H7 can cause the potentially fatal complication hemolytic uremic syndrome, and currently only supportive therapy is available. Lack of suitable animal models has hindered study of this disease. Induced human intestinal organoids (iHIOs), generated by in vitro differentiation of pluripotent stem cells, represent differentiated human intestinal tissue. We show that iHIOs with addition of human neutrophils can model E. coli intestinal infection and innate cellular responses...
2017: PloS One
https://www.readbyqxmd.com/read/28610446/impacts-of-pulsed-electric-field-and-heat-treatment-on-quality-and-sensory-properties-and-microbial-inactivation-of-pomegranate-juice
#14
Gulsun A Evrendilek
Synergistic effects of pulsed electric field+mild heat on quality properties of pomegranate juice were modeled using the best-fit multiple (non-) linear regression models with inactivation kinetics parameters of Escherichia coli O157:H7 and Staphylococcus aureus. No significant difference was detected between the control and the treated samples in terms of pH; °Brix; total antioxidant capacity; total monomeric anthocyanin content; total ascorbic acid concentration; and the sensory properties of flavor, taste, aftertaste, and overall acceptance ( p > 0...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/28607988/synthesis-structures-and-biomolecular-interactions-of-new-silver-i-5-5-diethylbarbiturate-complexes-of-monophosphines-targeting-gram-positive-bacteria-and-breast-cancer-cells
#15
Veysel T Yilmaz, Ceyda Icsel, Jenaidullah Batur, Seyma Aydinlik, Murat Cengiz, Orhan Buyukgungor
A series of new silver(i) 5,5-diethylbarbiturate (barb) complexes with the formulas [Ag2(μ-barb)2(PPh3)2] (1), [Ag(barb)(PPh2Cy)] (2), [Ag(barb)(PPhCy2)] (3) and [Ag(barb)(PCy3)] (4) (PPh3 = triphenylphosphine, PPh2Cy = diphenylcyclohexylphosphine, PPhCy2 = dicyclohexylphenylphosphine and PCy3 = tricyclohexylphosphine) were synthesized and fully characterized by elemental analysis, IR, NMR, ESI-MS and X-ray crystallography. All the complexes display a significant affinity towards DNA with a groove binding mode and also strongly bind to BSA via hydrophobic interactions...
June 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28607374/amplifying-the-signal-of-localized-surface-plasmon-resonance-sensing-for-the-sensitive-detection-of-escherichia-coli-o157-h7
#16
Liping Song, Lei Zhang, Youju Huang, Liming Chen, Ganggang Zhang, Zheyu Shen, Jiawei Zhang, Zhidong Xiao, Tao Chen
Gold nanorods (Au NRs) based localized surface plasmon resonance (LSPR) sensors have been widely employed in various fields including biology, environment and food safety detection, but their size- and shape-dependent sensitivity limits their practical applications in sensing and biological detection. In our present work, we proposed an approach to maximally amplify the signal of Au NRs based LSPR sensing by coating an optimized thickness of mesoporous silica onto Au NRs. The plasmonic peaks of Au NRs@SiO2 with different shell thickness showed finely linear response to the change of surrounding refractive index...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28607018/antibiotic-mediated-modulations-of-outer-membrane-vesicles-in-enterohemorrhagic-escherichia-coli-o104-h4-and-o157-h7
#17
Andreas Bauwens, Lisa Kunsmann, Helge Karch, Alexander Mellmann, Martina Bielaszewska
Ciprofloxacin, meropenem, fosfomycin, and polymyxin B strongly increase production of outer membrane vesicles (OMVs) in Escherichia coli O104:H4 and O157:H7. Ciprofloxacin also upregulates OMV-associated Shiga toxin 2a, the major virulence factor of these pathogens, whereas the other antibiotics increase OMV production without the toxin. Both these effects might worsen the clinical outcome of infections caused by Shiga toxin-producing E. coli Our data support the existing recommendations to avoid antibiotics for treatment of these infections...
June 12, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28602303/poly-l-lysine-brushes-on-magnetic-nanoparticles-for-ultrasensitive-detection-of-escherichia-coli-o157-h7
#18
Jing Wu, Yan Chen, Yu Wang, Hong Yin, Zhitao Zhao, Nan Liu, Mengxia Xie, Yiping Chen
We have developed a magnetic enzyme-linked immunosorbent assay (MELISA) based poly-L-lysine (PLL) mediated brushes on magnetic nanoparticles (MNPs) for detection of Escherichia coli O157:H7 in river water samples. In the MELISA, we couple PLL on the surface of magnetic nanoparticles to prepare the PLL brushes (MPLLBs). PLL with plentiful amine groups provides multi-binding sites to allow the binding of both horse radish peroxidase (HRP) and antibody (Ab) on the surface of the MPLLBs with high capacity. Compared with the conventional particles (the binding capacity of MNPs for HRP and Ab are 19μg/mg and 16μg/mg, respectively), MPLLBs have achieved an improvement of 43-fold and 24-fold in binding capacity for HRP (816μg/mg, protein μg per mg of MPLLBs) and Ab (387μg/mg), respectively...
September 1, 2017: Talanta
https://www.readbyqxmd.com/read/28598391/rapid-waterborne-pathogen-detection-with-mobile-electronics
#19
Tsung-Feng Wu, Yu-Chen Chen, Wei-Chung Wang, Ashwini S Kucknoor, Che-Jen Lin, Yu-Hwa Lo, Chun-Wei Yao, Ian Lian
Pathogen detection in water samples, without complex and time consuming procedures such as fluorescent-labeling or culture-based incubation, is essential to public safety. We propose an immunoagglutination-based protocol together with the microfluidic device to quantify pathogen levels directly from water samples. Utilizing ubiquitous complementary metal-oxide-semiconductor (CMOS) imagers from mobile electronics, a low-cost and one-step reaction detection protocol is developed to enable field detection for waterborne pathogens...
June 9, 2017: Sensors
https://www.readbyqxmd.com/read/28597831/ongoing-haemolytic-uraemic-syndrome-hus-outbreak-caused-by-sorbitol-fermenting-sf-shiga-toxin-producing-escherichia-coli-stec-o157-germany-december-2016-to-may-2017
#20
Sabine Vygen-Bonnet, Bettina Rosner, Hendrik Wilking, Angelika Fruth, Rita Prager, Annelene Kossow, Christina Lang, Sandra Simon, Juliane Seidel, Mirko Faber, Anika Schielke, Kai Michaelis, Alexandra Holzer, Rolf Kamphausen, Daniela Kalhöfer, Sebastian Thole, Alexander Mellmann, Antje Flieger, Klaus Stark
We report an ongoing, protracted and geographically dispersed outbreak of haemolytic uraemic syndrome (HUS) and gastroenteritis in Germany, involving 30 cases since December 2016. The outbreak was caused by the sorbitol-fermenting immotile variant of Shiga toxin-producing (STEC) Escherichia coli O157. Molecular typing revealed close relatedness between isolates from 14 cases. One HUS patient died. Results of a case-control study suggest packaged minced meat as the most likely food vehicle. Food safety investigations are ongoing...
May 25, 2017: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
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