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https://www.readbyqxmd.com/read/28330283/multiplex-pcr-for-simultaneous-identification-of-e-coli-o157-h7-salmonella-spp-and-l-monocytogenes-in-food
#1
Thuy Trang Nguyen, Vo Van Giau, Tuong Kha Vo
The rapid detection of pathogens in food is becoming increasingly critical for ensuring the safety of consumers, since the majority of food-borne illnesses and deaths are caused by pathogenic bacteria. Hence, rapid, sensitive, inexpensive and convenient approaches to detect food-borne pathogenic bacteria is essential in controlling food safety. In this study, a multiplex PCR assay for the rapid and simultaneous detection of Escherichia coli O157:H7, Salmonella spp. and Listeria monocytogenes was established...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330075/a-novel-multiplex-pcr-method-for-the-detection-of-virulence-associated-genes-of-escherichia-coli-o157-h7-in-food
#2
Vo Van Giau, Thuy Trang Nguyen, Thi Kim Oanh Nguyen, Thi Thuy Hang Le, Tien Dung Nguyen
Shiga toxin-producing Escherichia coli O157:H7 (E. coli O157:H7) strains are foodborne infectious agents that cause a number of life-threatening diseases, including hemorrhagic colitis (HC) and hemolytic uremic syndrome (HUS). Shiga toxin 1 (stx1), shiga toxin 2 (stx2), or a combination of both are responsible for most clinical symptoms of these diseases. Hence, various diagnostic methods have been developed so far to detect shiga toxins such as cell culture, ELISA, Rapid Latex Agglutination (RPLA) and hybridization, but due to high costs and labor time in addition to low sensitivity, they have not received much attention...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28321227/co-expression-with-the-type-3-secretion-chaperone-cest-from-enterohemorrhagic-e-coli-increases-accumulation-of-recombinant-tir-in-plant-chloroplasts
#3
Jacqueline MacDonald, Sean Miletic, Typhanie Gaildry, Adam Chin-Fatt, Rima Menassa
Type 3 secretion systems (T3SSs) are utilized by pathogenic Escherichia coli to infect their hosts and many proteins from these systems are affected by chaperones specific to T3SS-containing bacteria. Toward developing a recombinant vaccine against enterohaemorrhagic E. coli (EHEC), we expressed recombinant T3SS and related proteins from predominant EHEC serotypes in Nicotiana chloroplasts. Nicotiana benthamiana were transiently transformed to express chloroplast-targeted Tir, NleA, and EspD from the EHEC serotype O157:H7; a fusion of EspA proteins from serotypes O157:H7 and O26:H11; and a fusion of epitopes of Tir (Tir-ep) from serotypes O157:H7, O26:H11, O45:H2, and O111:H8...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28320988/characterization-of-shiga-toxin-producing-escherichia-coli-from-feces-of-sika-deer-cervus-nippon-in-japan-using-pcr-binary-typing-analysis-to-evaluate-their-potential-human-pathogenicity
#4
Hidenori Kabeya, Shingo Sato, Shinya Oda, Megumi Kawamura, Mariko Nagasaka, Masanari Kuranaga, Eiji Yokoyama, Shinichiro Hirai, Atsushi Iguchi, Tomoe Ishihara, Toshiro Kuroki, Tomoko Morita-Ishihara, Sunao Iyoda, Jun Terajima, Makoto Ohnishi, Soichi Maruyama
This study examined the potential pathogenicity of Shiga toxin-producing Escherichia coli (STEC) in feces of sika deer by PCR binary typing (P-BIT), using 24 selected STEC genes. A total of 31 STEC strains derived from sika deer in 6 prefectures of Japan were O-serotyped and found to be O93 (n=12), O146 (n=5), O176 (n=3), O130 (n=3), O5 (n=2), O7 (n=1), O96 (n=1), O116 (n=1), O141 (n=1), O157 (n=1) and O-untypable (n=1). Of the 31 STEC strains, 13 carried both stx1 and stx2, 5 carried only stx1, and 13 carried one or two variants of stx2...
March 18, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28316862/prevalence-and-antimicrobial-susceptibility-pattern-of-e-coli-o157-h7-isolated-from-traditionally-marketed-raw-cow-milk-in-and-around-asosa-town-western-ethiopia
#5
Nigatu Disassa, Berhanu Sibhat, Shimelis Mengistu, Yimer Muktar, Dinaol Belina
A cross-sectional study was conducted from October 2014 to July 2015 to determine the prevalence and populations of E. coli as well as the prevalence and antimicrobial susceptibility of E. coli O157:H7 isolated from raw milk. Biochemical and serological tests methods were used to confirm E. coli and E. coli O157:H7 and isolates were subjected to antimicrobial susceptibility test using the agar disc diffusion method. Out of 380 raw milk samples examined, 129 (33.9%) and 11 (2.9%) were contaminated with E. coli and E...
2017: Veterinary Medicine International
https://www.readbyqxmd.com/read/28316592/influence-of-stress-factors-related-to-cheese-making-process-and-to-stec-detection-procedure-on-the-induction-of-stx-phages-from-stec-o26-h11
#6
Ludivine Bonanno, Benjamin Delubac, Valérie Michel, Frédéric Auvray
Shiga toxin-producing Escherichia coli (STEC) are responsible for human infections, ranging from mild watery diarrhea to hemorrhagic colitis (CH) that may be complicated by hemolytic uremic syndrome (HUS). The main STEC virulence factor is Shiga toxin encoded by the stx gene, located in the genome of a bacteriophage integrated into the bacterial chromosome. The serotype O26:H11 is the second HUS-causing serotype worldwide (after O157:H7), and the first found in dairy products such as raw-milk cheeses. A small number of HUS cases identified each year in France are caused by serotype O26:H11...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28319798/cold-plasma-activated-hydrogen-peroxide-aerosol-inactivates-escherichia-coli-o157-h7-salmonella-typhimurium-and-listeria-innocua-and-maintains-quality-of-grape-tomato-spinach-and-cantaloupe
#7
Yunbin Jiang, Kimberly Sokorai, Georgios Pyrgiotakis, Philip Demokritou, Xihong Li, Sudarsan Mukhopadhyay, Tony Jin, Xuetong Fan
The purpose of this study was to investigate the efficacy of aerosolized hydrogen peroxide in inactivating bacteria and maintaining quality of grape tomatoes, baby spinach leaves and cantaloupes. Stem scars and smooth surfaces of tomatoes, spinach leaves, and cantaloupe rinds, inoculated with Escherichia coli O157:H7, Salmonella Typhimurium and Listeria innocua, were treated for 45s followed by additional 30min dwell time with hydrogen peroxide (7.8%) aerosols activated by atmospheric cold plasma. Non-inoculated samples were used to study the effects on quality and native microflora populations...
March 10, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28319218/spontaneous-and-specific-binding-of-enterohemorrhagic-escherichia-coli-to-overoxidized-polypyrrole-coated-microspheres
#8
Xueling Shan, Takuya Yamauchi, Yojiro Yamamoto, Saroh Niyomdecha, Kengo Ishiki, Dung Q Le, Hiroshi Shiigi, Tsutomu Nagaoka
Specific identification of enterohemorrhagic Escherichia coli was achieved using microspheres coated with overoxidized polypyrrole. The microspheres are well dispersed in aqueous media, and they specifically, spontaneously, and efficiently bind E. coli O157:H7 through surface area effects. In addition, we found that light-scattering by a single microsphere depended linearly on the number of bound cells.
March 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28304328/bactericidal-effect-of-pterostilbene-alone-and-in-combination-with-gentamicin-against-human-pathogenic-bacteria
#9
Wee Xian Lee, Dayang Fredalina Basri, Ahmad Rohi Ghazali
The antibacterial activity of pterostilbene in combination with gentamicin against six strains of Gram-positive and Gram-negative bacteria were investigated. The minimum inhibitory concentration and minimum bactericidal concentration of pterostilbene were determined using microdilution technique whereas the synergistic antibacterial activities of pterostilbene in combination with gentamicin were assessed using checkerboard assay and time-kill kinetic study. Results of the present study showed that the combination effects of pterostilbene with gentamicin were synergistic (FIC index < 0...
March 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28304216/characterizing-the-multidrug-resistance-of-non-o157-shiga-toxin-producing-escherichia-coli-isolates-from-cattle-farms-and-abattoirs
#10
Carrie-Ann Kennedy, Séamus Fanning, Maria Karczmarczyk, Brian Byrne, Áine Monaghan, Declan Bolton, Torres Sweeney
Non-O157 Shiga toxin-producing Escherichia coli (STECs) are not as well characterized as O157 STEC cases, despite their similar prevalence in many countries. Hence, the objective of this study was to investigate the phenotypic and genotypic basis of multidrug resistance (MDR) in non-O157 STEC farm- and abattoir-sourced isolates and assess the potential dissemination of these MDR profiles in vitro. Susceptibility testing to 20 antimicrobials was performed on 146 non-O157 STECs isolated from farm and abattoir environments...
March 17, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28302788/high-quality-genome-sequence-of-an-escherichia-coli-o157-strain-carrying-an-mcr-1-resistance-gene-isolated-from-a-patient-in-the-united-states
#11
Rebecca L Lindsey, Dhwani Batra, Lori Rowe, Vladimir N Loparev, Devon Stripling, Lisley Garcia-Toledo, Kristen Knipe, Phalasy Juieng, Mili Sheth, Haley Martin, Alison Laufer Halpin
Enterobacteriaceae carrying plasmid-mediated colistin resistance have been found around the world. We report here the high-quality whole-genome sequence of an Escherichia coli O157:H48 isolate (2016C-3936C1) from Connecticut that carried the mcr-1 resistance gene on an IncX4-type plasmid.
March 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28296951/in-silico-design-expression-and-purification-of-novel-chimeric-escherichia-coli-o157-h7-ompa-fused-to-ltb-protein-in-escherichia-coli
#12
Aytak Novinrooz, Taghi Zahraei Salehi, Roya Firouzi, Sina Arabshahi, Abdollah Derakhshandeh
E. coli O157:H7, one of the major EHEC serotypes, is capable of developing bloody diarrhea, hemorrhagic colitis (HC), and fatal hemolytic uremic syndrome (HUS) and is accompanied by high annual economic loss worldwide. Due to the increased risk of HC and HUS development following antibiotic therapy, the prevention of infections caused by this pathogen is considered to be one of the most effective ways of avoiding the consequences of this infection. The main aim of the present study was to design, express, and purify a novel chimeric protein to develope human vaccine candidate against E...
2017: PloS One
https://www.readbyqxmd.com/read/28294683/evaluation-of-rectoanal-mucosal-swab-sampling-for-molecular-detection-of-enterohemorrhagic-escherichia-coli-in-beef-cattle
#13
Getahun E Agga, Terrance M Arthur, Susanne Hinkley, Joseph M Bosilevac
Cattle are a primary reservoir of enterohemorrhagic Escherichia coli (EHEC), and contaminated beef products are a source of human infections. The U.S. Department of Agriculture Food Safety and Inspection Service declared seven EHEC serogroups (O26, O45, O103, O111, O121, O145, and O157) as adulterants in raw ground beef. Sampling a large number of animals for EHEC surveillance or evaluations of EHEC-focused preharvest interventions requires a convenient and robust sampling method. We evaluated the diagnostic performance of rectoanal mucosal swab (RAMS) for the detection of the top seven EHEC serogroups...
March 15, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28294553/nitric-oxide-enhanced-shiga-toxin-production-was-regulated-by-fur-and-reca-in-enterohemorrhagic-escherichia-coli-o157
#14
Kimitoshi Ichimura, Takeshi Shimizu, Akio Matsumoto, Shinichiro Hirai, Eiji Yokoyama, Hiroki Takeuchi, Kinnosuke Yahiro, Masatoshi Noda
Enterohemorrhagic Escherichia coli (EHEC) produces Shiga toxin 1 (Stx1) and Shiga toxin 2 (Stx2). Nitric oxide (NO), which acts as an antimicrobial defense molecule, was found to enhance the production of Stx1 and Stx2 in EHEC under anaerobic conditions. Although EHEC O157 has two types of anaerobic NO reductase genes, an intact norV and a deleted norV, in the deleted norV-type EHEC, a high concentration of NO (12-29 μmol/L, maximum steady-state concentration) is required for enhanced Stx1 production and a low concentration of NO (~12 μmol/L, maximum steady-state concentration) is sufficient for enhanced Stx2 production under anaerobic conditions...
March 15, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28292660/prevalence-antimicrobial-resistance-and-multiple-locus-variable-number-tandem-repeat-analysis-profiles-of-diarrheagenic-escherichia-coli-isolated-from-different-retail-foods
#15
Lili Wang, Hiromi Nakamura, Eriko Kage-Nakadai, Yukiko Hara-Kudo, Yoshikazu Nishikawa
Diarrheagenic E. coli (DEC) isolates were recovered from local retail markets and the Osaka Municipal Central Wholesale Market in Japan. Retail food samples were collected for analysis in Osaka Japan from 2005 to 2008 and consisted of 32 beef, 28 pork, 20 poultry, 136 fish, 66 fruits and vegetables and 51 ready-to-eat (RTE) food samples. A total of 82 DEC strains were recovered from 64 (19%) food samples with the highest prevalence in poultry (100%, 20/20), followed by pork (54%, 15/28), beef (28%, 9/32), fruits and vegetables (12%, 8/66), fish (6...
March 7, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28289439/detection-of-extremely-low-concentration-waterborne-pathogen-using-a-multiplexing-self-referencing-sers-microfluidic-biosensor
#16
Chao Wang, Foram Madiyar, Chenxu Yu, Jun Li
BACKGROUND: It is challenging to achieve ultrasensitive and selective detection of waterborne pathogens at extremely low levels (i.e., single cell/mL) using conventional methods. Even with molecular methods such as ELISA or PCR, multi-enrichment steps are needed which are labor and cost intensive. In this study, we incorporated nano-dielectrophoretic microfluidic device with Surface enhanced Raman scattering (SERS) technique to build a novel portable biosensor for easy detection and characterization of Escherichia coli O157:H7 at high sensitivity level (single cell/mL)...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/28289405/a-small-regulatory-rna-contributes-to-the-preferential-colonization-of-escherichia-coli-o157-h7-in-the-large-intestine-in-response-to-a-low-dna-concentration
#17
Runhua Han, Letian Xu, Ting Wang, Bin Liu, Lei Wang
Enterohemorrhagic Escherichia coli (EHEC) serotype O157:H7 (O157) is one of the most notorious human pathogens, causing severe disease in humans worldwide. O157 specifically colonizes the large intestine of mammals after passing through the small intestine, and this process is influenced by differential signals between the two regions. Small regulatory RNAs (sRNAs) are able to sense and respond to environmental changes and regulate diverse physiological processes in pathogenic bacteria. Although some sRNAs of O157 have been extensively investigated, whether these molecules can sense differences between the small and large intestine and influence the preferential colonization in the large intestine by O157 remains unknown...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28286570/strain-specific-probiotic-properties-of-lactic-acid-bacteria-and-their-interference-with-human-intestinal-pathogens-invasion
#18
Raffaella Campana, Saskia van Hemert, Wally Baffone
BACKGROUND: One of the working mechanisms of probiotic bacteria is their ability to compete with pathogens. To define the probiotic properties of seven Lactic Acid Bacteria (LAB) strains, we tested them for survival in simulated gastro-intestinal conditions, antimicrobial activities, co-aggregative abilities, and interferences studies against five human intestinal pathogens (Salmonella enteritidis ATCC 13076, Listeria monocytogenes ATCC 7644, Escherichia coli O157: H7 ATCC 35150, Cronobacter sakazakii ATCC 29544 and Campylobacter jejuni ATCC 33291)...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28285115/teriyaki-sauce-with-carvacrol-or-thymol-effectively-controls-escherichia-coli-o157-h7-listeria-monocytogenes-salmonella-typhimurium-and-indigenous-flora-in-marinated-beef-and-marinade
#19
Hyeree Moon, Nam Hee Kim, Soon Han Kim, Younghoon Kim, Jee Hoon Ryu, Min Suk Rhee
An effective bactericidal cold-marinating method for beef products is described, exploiting the synergism between soy sauce and natural compounds (carvacrol, CV or thymol, TM) to reduce microbiological risks. Beef slices inoculated with Escherichia coli O157:H7, Listeria monocytogenes, and Salmonella Typhimurium (3.1-3.5logCFU/g) were marinated in a teriyaki sauce with or without CV and TM (0.3 and 0.5%). After 1, 3, and 7days at 4°C, indigenous microflora population, color, lipid oxidation, marinade uptake, and pH of marinated beef and leftover marinade samples were examined...
March 6, 2017: Meat Science
https://www.readbyqxmd.com/read/28284606/use-of-signature-tagged-mutagenesis-to-identify-genes-associated-with-colonization-of-sheep-by-e-coli-o157-h7
#20
Nancy A Cornick, Josh Pitzer, Amy F Helgerson, Melissa L Madsen, Kathy T Kurth, Qianjun Xiao, F Chris Minion
Outbreaks of Escherichia coli O157:H7 in the United States due to contaminated foods are a public health issue and a continuing problem. The major reservoir for these organisms is the gastrointestinal tract of ruminants where they are a member of the resident microbiota. Several factors that contribute to the colonization of cattle have been identified, but a systematic screen of genes that might contribute to the colonization and persistence phenotype in mature ruminants has not been reported. Using a sheep model of persistence, signature tagged mutagenesis (STM) was used to screen 1326 mutants for a persistence-negative phenotype of E...
March 2017: Veterinary Microbiology
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