keyword
MENU ▼
Read by QxMD icon Read
search

Salmonella pathogenicity

keyword
https://www.readbyqxmd.com/read/29156625/gene-based-pathogen-detection-can-we-use-qpcr-to-predict-the-outcome-of-diagnostic-metagenomics
#1
Sandra Christine Andersen, Mette Sofie Rousing Fachmann, Kristoffer Kiil, Eva Møller Nielsen, Jeffrey Hoorfar
In microbial food safety, molecular methods such as quantitative PCR (qPCR) and next-generation sequencing (NGS) of bacterial isolates can potentially be replaced by diagnostic shotgun metagenomics. However, the methods for pre-analytical sample preparation are often optimized for qPCR, and do not necessarily perform equally well for qPCR and sequencing. The present study investigates, through screening of methods, whether qPCR can be used as an indicator for the optimization of sample preparation for NGS-based shotgun metagenomics with a diagnostic focus...
November 20, 2017: Genes
https://www.readbyqxmd.com/read/29155570/chemistry-antimicrobial-mechanisms-and-antibiotic-activities-of-cinnamaldehyde-against-pathogenic-bacteria-in-animal-feeds-and-human-foods
#2
Mendel Friedman
Cinnamaldehyde is a major constituent of cinnamon essential oils produced by aromatic cinnamon plants. This compound has been reported to exhibit antimicrobial properties in vitro in laboratory media and in animal feeds and human foods contaminated with disease-causing bacteria including Bacillus cereus, Campylobacter jejuni, Clostridium perfringens, Escherichia coli, Listeria monocytogenes, and Salmonella enterica. This integrated review surveys and interprets our current knowledge of the chemistry, analysis, safety, mechanism of action, and antibiotic activities of cinnamaldehyde in food animal (cattle, lambs, calves, pigs, poultry) diets and in widely consumed liquid (apple, carrot, tomato, and watermelon juices, milk) and solid foods...
November 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29154717/characterization-of-escherichia-coli-and-salmonella-from-victoria-australia-dairy-farm-environments
#3
Catherine M McAuley, Kate E McMillan, Sean C Moore, Narelle Fegan, Edward M Fox
Safe dairy food production starts at the farm level, with the presence of pathogens on farms potentially impacting the downstream food supply. Studies often commence with looking for pathogens in fecal material of farm animals, predominantly cows; however, pathogens may arise from other on-farm sources. In Australia, few studies have looked at the broader farm environment, particularly in relation to Escherichia coli and Salmonella. The present study characterized the genetic similarity of these pathogens from bovine, ovine, and caprine dairy farm environments and related this to the stx1, stx2, eae, or ehx virulence markers in E...
November 20, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29150501/glna-truncation-in-salmonella-enterica-results-in-a-small-colony-variant-phenotype-attenuated-host-cell-entry-and-reduced-expression-of-flagellin-and-spi-1-associated-effector-genes
#4
Philipp Aurass, Juliane Düvel, Susanne Karste, Ulrich Nübel, Wolfgang Rabsch, Antje Flieger
Many pathogenic bacteria use sophisticated survival strategies to overcome harsh environmental conditions. One is the formation of slow-growing subpopulations termed small colony variants (SCVs). Here we characterize an SCV, which spontaneously emerged from an axenic Salmonella enterica serovar Typhimurium water culture. We found that the SCV harbors a frameshift mutation in the glutamine synthetase gene glnA leading to a ∼90% truncation of the corresponding protein. Glutamine synthetase, a central enzyme in nitrogen assimilation, converts glutamate and ammonia to glutamine...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29149629/development-and-application-of-rti-pcr-method-for-common-food-pathogen-presence-and-quantity-in-beef-sheep-and-chicken-meat
#5
Ismail Akyol
Two different RTi-PCR protocol were designed and quantifications were validated by using various amounts of DNA. Multiplex AG(R)1 and AG(R)2 RTi-PCR amplification reactions quantified successfully for Clostridium perfringens, Enterococcus faecalis, Staphylococcus aureus, Escherichia coli O157:H7 and Salmonella enterica. Using the validated multiplex RTi-PCR reactions, the presence and quantification of pathogens were investigated in 40 beef, 41 sheep and 30 chicken meat samples. Results showed that the existence of C...
November 14, 2017: Meat Science
https://www.readbyqxmd.com/read/29149266/association-between-prior-antibiotic-therapy-and-subsequent-risk-of-community-acquired-infections-a-systematic-review
#6
Umer Malik, David Armstrong, Mark Ashworth, Alex Dregan, Veline L'Esperance, Lucy McDonnell, Mariam Molokhia, Patrick White
Background: Antibiotic use can have negative unintended consequences including disruption of the human microbiota, which is thought to protect against pathogen overgrowth. We conducted a systematic review to assess whether there is an association between exposure to antibiotics and subsequent risk of community-acquired infections. Methods: We searched MEDLINE, EMBASE and Web of Science for studies published before 30 June 2017, examining the association between antibiotic use and subsequent community-acquired infection...
November 14, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29147098/purification-and-anti-pathogenic-properties-of-immunoglobulin-concentrates-from-porcine-blood
#7
Tae-Hwan Jung, Jae-Hwan Choi, Kyung-Chul Koh, Woo-Min Jeon, Kyoung-Sik Han
During slaughtering, animal blood is typically discarded, resulting in water pollution. However, this discarded blood has valuable components, such as immunoglobulin (Ig). Although several studies have been conducted to develop methods for effective recycling of slaughterhouse blood, they have not been commercially utilized in Korea. Here, we extracted an Ig-rich fraction from porcine blood that was then subjected to various in vitro tests, including pathogen growth inhibition, antigenic cross-reactivity, and anti-toxin activity...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29146500/motility-biofilm-formation-apoptotic-effect-and-virulence-gene-expression-of-atypical-salmonella-typhimurium-outside-and-inside-caco-2-cells
#8
Ibtissem Chakroun, Abdelkarim Mahdhi, Patricia Morcillo, Hector Cordero, Alberto Cuesta, Amina Bakhrouf, Kacem Mahdouani, M Ángeles Esteban
Disease outbreaks related to waterborne pathogen contamination throughout the world as well as challenges that lie ahead for addressing persistent infection are of renewed interest. In this research, we studied the effects of prolonged exposure of Salmonella enterica serovar Typhimurium to the cues encountered in the extracellular environment particularly in seawater microcosm on bacterial virulence and subsequent infection in Caco-2 cells. Our data show a significant difference in biofilm formation, swimming and swarming motilities between normal and stressed cells of S...
November 13, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29146261/a-comprehensive-review-of-non-enterica-subspecies-of-salmonella-enterica
#9
REVIEW
Alexandre Lamas, José Manuel Miranda, Patricia Regal, Beatriz Vázquez, Carlos Manuel Franco, Alberto Cepeda
Salmonella is a major foodborne pathogen with a complex nomenclature. This genus is composed of two species, S. enterica and S. bongori. S. enterica is divided into six subspecies. S. enterica subspecies enterica is composed of more than 1500 serotypes with some of great importance, such as S. Typhimurium and S. Enteritidis. S. enterica subsp. enterica is responsible of more than 99% of human salmonellosis and therefore it is widely studied. However, the non-enterica subspecies of S. enterica have been little studied...
January 2018: Microbiological Research
https://www.readbyqxmd.com/read/29144463/a-single-cell-survey-of-the-small-intestinal-epithelium
#10
Adam L Haber, Moshe Biton, Noga Rogel, Rebecca H Herbst, Karthik Shekhar, Christopher Smillie, Grace Burgin, Toni M Delorey, Michael R Howitt, Yarden Katz, Itay Tirosh, Semir Beyaz, Danielle Dionne, Mei Zhang, Raktima Raychowdhury, Wendy S Garrett, Orit Rozenblatt-Rosen, Hai Ning Shi, Omer Yilmaz, Ramnik J Xavier, Aviv Regev
Intestinal epithelial cells absorb nutrients, respond to microbes, function as a barrier and help to coordinate immune responses. Here we report profiling of 53,193 individual epithelial cells from the small intestine and organoids of mice, which enabled the identification and characterization of previously unknown subtypes of intestinal epithelial cell and their gene signatures. We found unexpected diversity in hormone-secreting enteroendocrine cells and constructed the taxonomy of newly identified subtypes, and distinguished between two subtypes of tuft cell, one of which expresses the epithelial cytokine Tslp and the pan-immune marker CD45, which was not previously associated with non-haematopoietic cells...
November 16, 2017: Nature
https://www.readbyqxmd.com/read/29142277/genetic-metabolomic-and-transcriptomic-analyses-of-the-de-novo-l-cysteine-biosynthetic-pathway-in-the-enteric-protozoan-parasite-entamoeba-histolytica
#11
Ghulam Jeelani, Dan Sato, Tomoyoshi Soga, Tomoyoshi Nozaki
The de novo L-cysteine biosynthetic pathway is critical for the growth, antioxidative stress defenses, and pathogenesis of bacterial and protozoan pathogens, such as Salmonella typhimurium and Entamoeba histolytica. This pathway involves two key enzymes, serine acetyltransferase (SAT) and cysteine synthase (CS), which are absent in mammals and therefore represent rational drug targets. The human parasite E. histolytica possesses three SAT and CS isozymes; however, the specific roles of individual isoforms and significance of such apparent redundancy remains unclear...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141129/recent-trends-in-salmonella-outbreaks-and-emerging-technology-for-biocontrol-of-salmonella-using-phages-in-foods-a-review
#12
REVIEW
Jun-Hyun Oh, Mi-Kyung Park
Salmonella is one of the principal causes of foodborne outbreaks. As traditional control methods have shown efficacy against emerging Salmonella serotypes or antimicrobial-resistant Salmonella, new approaches have been attempted. The use of lytic phages for the biocontrol of Salmonella in food industry has become an attractive method owing to the many advantages offered by the use of phages as biocontrol agents. Phages are natural alternatives to traditional antimicrobial agents; they have proven effective in the control of bacterial pathogens in food industry, which has led to the development of different phage products...
November 15, 2017: Journal of Microbiology and Biotechnology
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
#13
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/29139345/herbicide-ingredients-change-salmonella-enterica-sv-typhimurium-and-escherichia-coli-antibiotic-responses
#14
Brigitta Kurenbach, Paddy S Gibson, Amy M Hill, Adam S Bitzer, Mark W Silby, William Godsoe, Jack A Heinemann
Herbicides are frequently released into both rural and urban environments. Commercial herbicide formulations induce adaptive changes in the way bacteria respond to antibiotics. Salmonella enterica sv. Typhimurium and Escherichia coli were exposed to common co-formulants of formulations, and S. enterica sv. Typhimurium was exposed to active ingredients dicamba, 2,4-D and glyphosate to determine what ingredients of the commercial formulations caused this effect. Co-formulants Tween80 and carboxymethyl cellulose induced changes in response, but the pattern of the responses differed from the active ingredients, and effect sizes were smaller...
November 17, 2017: Microbiology
https://www.readbyqxmd.com/read/29138086/eugenol-derivatives-prospectively-inhibit-l-asparaginase-a-heady-target-protein-of%C3%A2-salmonella-typhimurium
#15
Archana Vimal, Anubhuti Jha, Awanish Kumar
Salmonella typhimurium is the causative agent of severe human infections and mortality throughout the world. Pacing advent of new resistance mechanisms in this microorganism exists, rendering treatment of infectious disease difficult. Ciprofloxacin is no longer considered the first choice of antimicrobial agent due to the emergence of resistance. Therefore, the need for scenario is to find out novel drug target and its potential inhibitor to fight against this pathogen. The present study was undertaken to find out a novel drug target and its inhibitor for improving the current therapeutic methods for treating Salmonella infections...
November 11, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29138083/adaptations-in-the-physiological-heterogeneity-and-viability-of-shigella-dysenteriae-shigella-flexneri-and-salmonella-typhimurium-after-exposure-to-simulated-gastric-acid-fluid
#16
Atheesha Singh, Tobias George Barnard
Stomach acidity is an important barrier of the human body to protect itself from microbial pathogens entering the small intestine and causing infection. This study examined the survival adaptations of non-acid adapted diarrheal Shigella and Salmonella strains in an environment mimicking the human stomach. The bacterial responses to the challenge of acidic simulated gastric fluid were studied using flow cytometry physiological heterogeneity, membrane integrity and survival (culturability) respectively. Flow cytometry showed that bacterial cells, when exposed to gastric fluid, transformed distinctly, into physiologically heterogeneous sub-populations: intact, stressed and damaged cells, when stained with propidium iodide and thiazole orange...
November 11, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29134588/encapsulation-strategies-of-bacteriophage-felix-o1-for-oral-therapeutic-application
#17
Golam S Islam, Qi Wang, Parviz M Sabour
Due to emerging antibiotic-resistant strains among the pathogens, a variety of strategies, including therapeutic application of bacteriophages, have been suggested as a possible alternative to antibiotics in food animal production. As pathogen-specific biocontrol agents, bacteriophages are being studied intensively. Primarily their applications in the food industry and animal production have been recognized in the USA and Europe, for pathogens including Salmonella, Campylobacter, Escherichia coli, and Listeria...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29133155/a-prospective-study-of-travellers-diarrhoea-analysis-of-pathogen-findings-by-destination-in-various-sub-tropical-regions
#18
Tinja Lääveri, Katri Vilkman, Sari H Pakkanen, Juha Kirveskari, Anu Kantele
OBJECTIVES: Eighty million travellers visiting (sub)tropical regions contract travellers' diarrhoea (TD) each year, yet prospective data comparing the prevalence of TD pathogens in various geographical regions are scarce. Our recent study employing modern molecular methods found enteropathogenic (EPEC) and enteroaggregative (EAEC) Escherichia coli to be the most frequent pathogens, followed by enterotoxigenic E. coli (ETEC) and Campylobacter. We revisited our data to compare the findings by geographical region...
November 10, 2017: Clinical Microbiology and Infection
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
#19
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/29130383/identification-of-a-novel-gene-in-rod9-island-of-salmonella-enteritidis-involved-in-the-alteration-of-virulence-associated-genes-expression
#20
Susmita Das, Shilpa Ray, Daniel Ryan, Bikash Sahu, Mrutyunjay Suar
Salmonella enterica subsp. I serovar Enteritidis (S. Enteritidis), one of the causative agents for non-typhoidal gastrointestinal diseases in humans is an intracellular bacterium and mechanism for its invasion into host cells is critical to cause infection. The virulence of the pathogen is explained by the expression of genes located on its pathogenicity islands, mostly encoded under SPI-1 and SPI-2. However, S. Typhimurium SL1344, despite sharing ∼98% of its genome with S. Enteritidis P125109, lacks few regions of differences (ROD) that are hypothesized to impart virulence potential to S...
November 13, 2017: Virulence
keyword
keyword
94541
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"