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E. Coli O157

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https://www.readbyqxmd.com/read/29140746/inactivation-kinetics-of-pathogens-during-thermal-processing-in-acidified-broth-and-tomato-pur%C3%A3-e-ph-4-5
#1
Evann L Dufort, Jonathan Sogin, Mark R Etzel, Barbara H Ingham
Thermal inactivation kinetics for single strains of Shiga toxin-producing Escherichia coli (STEC), Listeria monocytogenes, and Salmonella enterica were measured in acidified tryptic soy broth (TSB; pH 4.5) heated at 54°C. Inactivation curves also were measured for single-pathogen five-strain cocktails of E. coli O157:H7, L. monocytogenes, and S. enterica heated in tomato purée (pH 4.5) at 52, 54, 56, and 58°C. Inactivation curves were fit using log-linear and nonlinear (Weibull) models. The Weibull model yields the time for a 5-log reduction (t*) and a curve shape parameter (β)...
November 15, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29137796/construction-of-proton-exchange-membranes-under-ultrasonic-irradiation-based-on-novel-fluorine-functionalizing-sulfonated-polybenzimidazole-cellulose-silica-bionanocomposite
#2
Sheida Esmaielzadeh, Hashem Ahmadizadegan
Novel sulfonated polybenzimidazole (s-PBI)/cellulose/silica bionanocomposite membranes were prepared from fluorine-containing s-PBI copolymer with a cellulose/silica precursor and a bonding agent. The introduction of the bonding agent results in the reinforcing interfacial interaction between s-PBI chains and the cellulose/silica nanoparticles. Commercially available silica nanoparticles were modified with biodegradable nanocellolose through ultrasonic irradiation technique. Transmission electron microscopy (TEM) analyses showed that the cellulose/silica composites were well dispersed in the s-PBI matrix on a nanometer scale...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29132042/long-range-interactions-keep-bacterial-cells-from-liquid-solid-interfaces-evidence-of-a-bacteria-exclusion-zone-near-nafion-surfaces-and-possible-implications-for-bacterial-attachment
#3
Yifan Cheng, Carmen I Moraru
Hydrophilic surfaces of both abiotic and biological origin have been shown to bear particle-exclusion zones as large as hundreds of micrometers at liquid-solid interfaces. Here we present the first systematic investigation and evidence for bacteria-free exclusion zones for several bacterial strains, including pathogens associated with hospital infections and/or foodborne outbreaks: Staphylococcus aureus, Escherichia coli O157:H7, and Listeria monocytogenes. Tests were carried out both in a phosphate buffer, as well as triptic soy broth (TSB) of high ionic strength...
November 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29130764/efficacy-of-a-blend-of-sulfuric-acid-and-sodium-sulfate-against-shiga-toxin-producing-escherichia-coli-salmonella-and-nonpathogenic-escherichia-coli-biotype-i-on-inoculated-prerigor-beef-surface-tissue
#4
Britteny R Scott-Bullard, Ifigenia Geornaras, Robert J Delmore, Dale R Woerner, James O Reagan, J Bred Morgan, Keith E Belk
A study was conducted to investigate the efficacy of a sulfuric acid-sodium sulfate blend (SSS) against Escherichia coli O157:H7, non-O157 Shiga toxin-producing E. coli (STEC), Salmonella, and nonpathogenic E. coli biotype I on prerigor beef surface tissue. The suitability of using the nonpathogenic E. coli as a surrogate for in-plant validation studies was also determined by comparing the data obtained for the nonpathogenic inoculum with those for the pathogenic inocula. Prerigor beef tissue samples (10 by 10 cm) were inoculated (ca...
December 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29123549/isolation-and-physiomorphological-characterization-of-escherichia-coli-o157-h7-infecting-bacteriophages-recovered-from-beef-cattle-operations
#5
Pushpinder Kaur Litt, Divya Jaroni
Bacteriophages, recovered from beef cattle environment and specifically targeting Escherichia coli O157:H7, were examined for their physiological and morphological characteristics. Degree of bacterial lysis and host range of isolated bacteriophages was determined against 55 isolates of E. coli O157:H7. Morphology of phages was examined under transmission electron microscope. Phage growth parameters, particularly rate of adsorption, rise period, latent period, and burst size were also determined. The stability of isolated phages was tested at acidic and alkaline pH, at high temperatures, and in cold storage...
2017: International Journal of Microbiology
https://www.readbyqxmd.com/read/29121863/multiplex-real-time-pcr-assay-for-detection-of-escherichia-coli-o157-h7-and-screening-for-non-o157-shiga-toxin-producing-e-coli
#6
Baoguang Li, Huanli Liu, Weimin Wang
BACKGROUND: Shiga toxin-producing Escherichia coli (STEC), including E. coli O157:H7, are responsible for numerous foodborne outbreaks annually worldwide. E. coli O157:H7, as well as pathogenic non-O157:H7 STECs, can cause life-threating complications, such as bloody diarrhea (hemolytic colitis) and hemolytic-uremic syndrome (HUS). Previously, we developed a real-time PCR assay to detect E. coli O157:H7 in foods by targeting a unique putative fimbriae protein Z3276. To extend the detection spectrum of the assay, we report a multiplex real-time PCR assay to specifically detect E...
November 9, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/29117268/general-response-of-salmonella-enterica-serovar-typhimurium-to-desiccation-a-new-role-for-the-virulence-factors-sopd-and-ssed-in-survival
#7
Alice Maserati, Ryan C Fink, Antonio Lourenco, Matthew L Julius, Francisco Diez-Gonzalez
Salmonella can survive for long periods under extreme desiccation conditions. This stress tolerance poses a risk for food safety, but relatively little is known about the molecular and cellular regulation of this adaptation mechanism. To determine the genetic components involved in Salmonella's cellular response to desiccation, we performed a global transcriptomic analysis comparing S. enterica serovar Typhimurium cells equilibrated to low water activity (aw 0.11) and cells equilibrated to high water activity (aw 1...
2017: PloS One
https://www.readbyqxmd.com/read/29115532/application-of-f0f1%C3%A2-atpase-immuno%C3%A2-biosensors-for-detecting-escherichia%C3%A2-coli-o157-h7
#8
Ling Wei, Bao-Ming Li, Cheng-Bin Wang, Zi-Jia Kang, Jie Sun, Hui-Juan Wu, Yong-Zhi Lun
Escherichia coli (E. coli) O157:H7 is an important food‑borne pathogen with a low infective threshold and high resistance to treatment. There are currently a number of detection methods available, however, the majority are time‑consuming, complex and expensive, thus it is hard for these methods to be applied in routine detection. Therefore, there is urgent requirement to develop more sensitive, rapid and specific detective techniques. In the present study, an immuno‑biosensor based on the interference of load to the F0F1‑ATPase rotation, indicated by the fluorescence fluctuation, was constructed to detect O157:H7...
November 7, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29111613/management-of-shiga-toxin-producing-escherichia-coli-infected-children-a-multi-national-multi-specialty-survey
#9
Stephen B Freedman, Silviu Grisaru, Jianling Xie, Susan Samuel, Andrew Dixon, Amy C Plint, David Schnadower
AIM: Research has highlighted the potential role that hydration status may play in predicting outcomes in Shiga toxin-producing Escherichia coli (STEC)-infected children. Because little is known about the management of STEC-infected children in the pre-haemolytic uremic syndrome phase, we compared paediatric emergency medicine and nephrologist-stated management approaches to STEC-infected children. METHODS: Members of the Pediatric Emergency Research Canada (PERC; n = 228), the Pediatric Emergency Medicine Collaborative Research Committee (PEM CRC; n = 221) and the Canadian Association of Pediatric Nephrologists (CAPN; n = 66) were surveyed...
November 7, 2017: Journal of Paediatrics and Child Health
https://www.readbyqxmd.com/read/29107907/correlation-between-e-%C3%A2-coli-levels-and-the-presence-of-foodborne-pathogens-in-surface-irrigation-water-establishment-of-a-sampling-program
#10
Pilar Truchado, Natalia Hernandez, Maria I Gil, Renata Ivanek, Ana Allende
To establish the association between microbial indicators and the presence of foodborne pathogens in irrigation water, Escherichia coli was enumerated using two quantification methods (plate counts and PMA-qPCR) and presence/absence of pathogenic microorganisms, including five strains from the Shiga toxigenic E. coli (O157:H7, O26, O103, O111 and O145) and Salmonella spp. were evaluated. The results confirmed that surface water can be considered a microbial hazard when used for irrigation. The levels of viable E...
October 23, 2017: Water Research
https://www.readbyqxmd.com/read/29107195/application-of-whole-genome-sequence-data-in-analyzing-the-molecular-epidemiology-of-shiga-toxin-producing-escherichia-coli-o157-h7-h
#11
Eiji Yokoyama, Shinichiro Hirai, Taichiro Ishige, Satoshi Murakami
Seventeen clusters of Shiga toxin-producing Escherichia coli O157:H7/- (O157) strains, determined by cluster analysis of pulsed-field gel electrophoresis patterns, were analyzed using whole genome sequence (WGS) data to investigate this pathogen's molecular epidemiology. The 17 clusters included 136 strains containing strains from nine outbreaks, with each outbreak caused by a single source contaminated with the organism, as shown by epidemiological contact surveys. WGS data of these strains were used to identify single nucleotide polymorphisms (SNPs) by two methods: short read data were directly mapped to a reference genome (mapping derived SNPs) and common SNPs between the mapping derived SNPs and SNPs in assembled data of short read data (common SNPs)...
October 17, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29103267/intestinal-parasitic-infections-and-environmental-water-contamination-in-a-rural-village-of-northern-lao-pdr
#12
Alexis Ribas, Chloé Jollivet, Serge Morand, Boupha Thongmalayvong, Silaphet Somphavong, Chern-Chiang Siew, Pei-Jun Ting, Saipin Suputtamongkol, Viengsaene Saensombath, Surapol Sanguankiat, Boon-Huan Tan, Phimpha Paboriboune, Kongsap Akkhavong, Kittipong Chaisiri
A field survey studying intestinal parasites in humans and microbial pathogen contamination at environment was performed in a Laotian rural village to identify potential risks for disease outbreaks. A parasitological investigation was conducted in Ban Lak Sip village, Luang Prabang, Lao PDR involving fecal samples from 305 inhabitants as well as water samples taken from 3 sites of the local stream. Water analysis indicated the presence of several enteric pathogens, i.e., Aeromonas spp., Vibrio spp., E. coli H7, E...
October 2017: Korean Journal of Parasitology
https://www.readbyqxmd.com/read/29091926/lactobacillus-reuteri-suppresses-e-coli-o157-h7-in-bovine-ruminal-fluid-toward-a-pre-slaughter-strategy-to-improve-food-safety
#13
Yolande Bertin, Chloé Habouzit, Lysiane Dunière, Marie Laurier, Alexandra Durand, David Duchez, Audrey Segura, Delphine Thévenot-Sergentet, Federico Baruzzi, Frédérique Chaucheyras-Durand, Evelyne Forano
The bovine gastrointestinal tract (GIT) is the main reservoir for enterohaemorrhagic Escherichia coli (EHEC) responsible for food-borne infections. Therefore, it is crucial to develop strategies, such as EHEC suppression by antagonistic microorganisms, to reduce EHEC survival in the GIT of cattle and to limit shedding and food contamination. Most human-derived Lactobacillus reuteri strains produce hydroxypropionaldehyde (HPA), an antimicrobial compound, during anaerobic reduction of glycerol. The capacity of L...
2017: PloS One
https://www.readbyqxmd.com/read/29080954/microbiological-risk-infection-assessment-using-qmra-in-agriculture-systems-in-c%C3%A3-te-d-ivoire-west-africa
#14
Parfait K Kouamé, Hung Nguyen-Viet, Kouassi Dongo, Christian Zurbrügg, Jean Biémi, Bassirou Bonfoh
Poor wastewater management that results from a lack of appropriate sanitation infrastructure contributes to increasing health risks in urban areas in Côte d'Ivoire. We assessed the health risks associated with the use of wastewater for watering salad destined for human consumption, to help local authorities in developing appropriate risk mitigation measures for Yamoussoukro, the political capital of Côte d'Ivoire. We applied a stochastic approach based on quantitative microbiological risk assessment (QMRA), focusing on wastewater for farming activities and salad consumption at the household level...
October 28, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29080423/prevalence-and-characteristics-of-shiga-toxin-producing-escherichia-coli-in-finishing-pigs-implications-on-public-health
#15
Wonhee Cha, Pina M Fratamico, Leah E Ruth, Andrew S Bowman, Jacqueline M Nolting, Shannon D Manning, Julie A Funk
Shiga toxin-producing Escherichia coli (STEC) are important food-borne pathogens, which can cause serious illnesses, including hemorrhagic colitis and hemolytic uremic syndrome. To study the epidemiology of STEC in finishing pigs and examine the potential risks they pose for human STEC infections, we conducted a longitudinal cohort study in three finishing sites. Six cohorts of pigs (2 cohorts/site, 20 pigs/cohort) were randomly selected, and fecal samples (n=898) were collected every two weeks through their finishing period...
October 21, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29079612/hindgut-mucosa-associated-microbiome-interacting-with-host-regulating-escherichia-coli-o157-h7-shedding-in-cattle
#16
Ou Wang, Tim A McAllister, Graham Plastow, Kim Stanford, Brent Selinger, Le Luo Guan
Cattle are the primary carrier of E. coli O157:H7, a foodborne human pathogen, and those shedding > 10(4) CFU/gram of feces of E. coli O157:H7 were defined as super-shedders (SS). This study investigated the recto-anal junction (RAJ) mucosa associated microbiota and its relationship with host gene expression in SS and cattle where E. coli O157:H7 was not detected (NS), aiming to elucidate the mechanisms involved in super-shedding. In total, 14 phyla, 66 families and 101 genera of RAJ mucosa-associated bacteria were identified and Firmicutes (61...
October 27, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29077065/glycomacropeptide-reduces-intestinal-epithelial-cell-barrier-dysfunction-and-adhesion-of-entero-hemorrhagic-and-entero-pathogenic-escherichia-coli-in-vitro
#17
Shane Feeney, Joseph Thomas Ryan, Michelle Kilcoyne, Lokesh Joshi, Rita Hickey
In recent years, the potential of glycosylated food components to positively influence health has received considerable attention. Milk is a rich source of biologically active glycoconjugates which are associated with antimicrobial, immunomodulatory, anti-adhesion, anti-inflammatory and prebiotic properties. Glycomacropeptide (GMP) is the C-terminal portion of kappa-casein that is released from whey during cheese-making by the action of chymosin. Many of the biological properties associated with GMP, such as anti-adhesion, have been linked with the carbohydrate portion of the protein...
October 27, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/29072326/antimicrobial-activity-of-suspensions-and-nanoemulsions-of-citral-in-combination-with-heat-or-pulsed-electric-fields
#18
E Pagán, D Berdejo, L Espina, D García-Gonzalo, R Pagán
The application of essential oils in form of nanoemulsions has been proposed as a method to improve their solubility in aqueous solutions, and hence their antimicrobial activity. The objective of this study was to evaluate the antimicrobial activity of citral, applied directly or in combined treatments with heat or pulsed electric fields (PEF), as a function of the inoculation procedure assayed: (i) a simple, vigorous shaking method by vortex agitation (suspension of citral; s-citral) or (ii) the previous preparation of nanoemulsions by the emulsion phase inversion (EPI) method (nanoemulsion of citral; n-citral)...
October 26, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/29071202/an-electrochemical-aptasensor-using-coaxial-capillary-with-magnetic-nanoparticle-urease-catalysis-and-pcb-electrode-for-rapid-and-sensitive-detection-of-escherichia-coli-o157-h7
#19
Lei Wang, Fengchun Huang, Gaozhe Cai, Lan Yao, Huilin Zhang, Jianhan Lin
The continuous outbreaks of foodborne diseases have drawn public attentions to food safety. Early screening of foodborne pathogens is crucial to prevent and control of foodborne diseases. In this study, a novel electrochemical aptasensor was developed for rapid and sensitive detection of E. coli O157:H7 using the coaxial capillary with immune magnetic nanoparticles (MNPs) for specific separation of the target bacteria, the urease with urea for amplification of the impedance signals, and the PCB gold electrode for measurement of the impedance change...
2017: Nanotheranostics
https://www.readbyqxmd.com/read/29059530/enhanced-antimicrobial-efficacy-of-bimetallic-porous-cuo-microspheres-decorated-with-ag-nanoparticles
#20
Xuemei Chen, Seockmo Ku, Justin A Weibel, Eduardo Ximenes, Xingya Liu, Michael Ladisch, Suresh V Garimella
The antimicrobial action of porous CuO microspheres (μCuO), Ag nanoparticles (nAg), and bimetallic porous CuO microspheres decorated with Ag nanoparticles (μCuO/nAg) was evaluated against surrogate microorganisms representative of pathogens commonly implicated in foodborne and healthcare-associated human infections. This work addressed the Gram-negative bacteria E. coli (Escherichia coli O157:H7-GFP B6-914), Salmonella (Salmonella enterica serovar enteritidis phage-type PT21), and the Gram-positive bacteria Listeria (Listeria innocua), as well as environmental microorganisms derived from local river water...
November 1, 2017: ACS Applied Materials & Interfaces
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