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Campylobacter jejuni

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https://www.readbyqxmd.com/read/29140745/passage-of-campylobacter-jejuni-and-campylobacter-coli-subtypes-through-0-45-and-0-65-micrometer-pore-size-nitrocellulose-filters
#1
Mark E Berrang, Richard J Meinersmann, Nelson A Cox
Campylobacter can be difficult to recover from complex samples due to overgrowth by background bacteria. A 0.45- or 0.65-μm-pore-size filter overlaid on agar plates can be used as a means to separate Campylobacter from confounding non-Campylobacter cells, facilitating detection on solid plating media. It is unclear what percentage of cells in a Campylobacter suspension passes through a filter and results in visible colonies. The objective of this study was to compare the number of Campylobacter cells detected by the filter method with those detected by direct plating and determine if the filter method can be used to estimate cellular density of an unknown Campylobacter in suspension...
November 15, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29133896/the-food-borne-pathogen-campylobacter-jejuni-responds-to-the-bile-salt-deoxycholate-with-countermeasures-to-reactive-oxygen-species
#2
Nicholas M Negretti, Christopher R Gourley, Geremy Clair, Joshua N Adkins, Michael E Konkel
Bile plays an important role in digestion, absorption of fats, and the excretion of waste products, while concurrently providing a critical barrier against colonization by harmful bacteria. Previous studies have demonstrated that gut pathogens react to bile by adapting their protein synthesis. The ability of pathogens to respond to bile is remarkably complex and still incompletely understood. Here we show that Campylobacter jejuni, a leading bacterial cause of human diarrheal illness worldwide, responds to deoxycholate, a component of bile, by altering global gene transcription in a manner consistent with a strategy to mitigate exposure to reactive oxygen stress...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133155/a-prospective-study-of-travellers-diarrhoea-analysis-of-pathogen-findings-by-destination-in-various-sub-tropical-regions
#3
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/29130018/virulence-and-antimicrobial-resistance-in-campylobacter-spp-from-a-peruvian-pediatric-cohort
#4
Angela Lluque, Maribel Riveros, Ana Prada, Theresa J Ochoa, Joaquim Ruiz
The presence of virulence factors (VFs) and mechanisms of quinolones and macrolide resistance was analyzed in Campylobacter spp. from a pediatric cohort study in Lima. In 149 isolates (39 Campylobacter jejuni and 24 Campylobacter coli from diarrheic cases; 57 C. jejuni and 29 C. coli from controls), the presence of the cdtABC and cadF genes and iam marker was established. Nalidixic acid, ciprofloxacin, erythromycin, and azithromycin susceptibilities were established in 115 isolates and tetracycline-susceptibility was established in 100 isolates...
2017: Scientifica
https://www.readbyqxmd.com/read/29128919/genome-wide-prediction-of-potential-vaccine-candidates-for-campylobacter-jejuni-using-reverse-vaccinology
#5
Richa Jain, Sarita Singh, Santosh Kumar Verma, Ankit Jain
Campylobacteriosis is a deadly disease which has developed resistance to most of the available chemotherapeutic agents. Although various studies provide evidence of acquired immunity following exposure to Campylobacter jejuni, no effective vaccine has been developed, still. Hence, there is an urgent need to identify potential vaccine candidates for Campylobacter species. In the proposed study, Campylobacter jejuni subsp. jejuni serotype O:2 (strain NCTC 11168) was taken and computational approach was employed to screen C...
November 11, 2017: Interdisciplinary Sciences, Computational Life Sciences
https://www.readbyqxmd.com/read/29121442/enteric-infections-in-young-children-are-associated-with-environmental-enteropathy-and-impaired-growth
#6
Christine Marie George, Vanessa Burrowes, Jamie Perin, Lauren Oldja, Shwapon Biswas, David Sack, Shahnawaz Ahmed, Rashidul Haque, Nurul Amin Bhuiyan, Tahmina Parvin, Sazzadul Islam Bhuyian, Mahmuda Akter, Shan Li, Gayathri Natarajan, Mohammad Shahnaij, Abu G Faruque, O Colin Stine
OBJECTIVE: To investigate the relationship between fecal contamination in child play spaces, enteric infections, environmental enteropathy (EE), and impaired growth among young children. METHODS: Prospective cohort study of 203 children 6-30 months of age in rural Bangladesh. Stool samples were analyzed by quantitative PCR for Shigella, Enterotoxigenic Escherichia coli (ETEC), Campylobacter jejuni, Giardia spp, and Cryptosporidium spp. Four fecal markers of intestinal inflammation were also measured: alpha-1-antitrypsin, myeloperoxidase, neopterin, and calprotectin...
November 9, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/29119393/in-vitro-culturing-and-storage-of-campylobacter-genus-bacteria
#7
N R Efimochkina, V V Stetsenko, I B Bykova, A S Polyanina, A S Aleshkina, S A Sheveleva
Experimental model for in vitro evaluation of Campylobacter genus bacteria growth kinetics, inhibition, or inactivation is proposed. The model allows quantitative evaluation of the sensitivity to various types of stress exposure and promotes detection of the regularities of their transformation into uncultivable forms. The model implies the use of 96-well plates for parallel culturing of several subpopulations of the test strain in media with various parameters. The proposed algorithm includes evaluation of the proportion of viable CFU to total level of planktonic and uncultivable cells in the population, which is estimated by the content of genomic DNA in the samples by quantitative PCR (or real-time PCR) with ciaB, cdtB, or 16S rRNA primers...
November 9, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29113919/lighting-up-my-life-a-lov-based-fluorescent-reporter-for-campylobacter-jejuni
#8
Bassam A Elgamoudi, Julian M Ketley
In this study, a LOV-based fluorescent reporter (light, oxygen, or voltage-sensing domains of phototropin), termed iLOV, was adapted for Campylobacter jejuni and used to investigate promoter activity via monitoring fluorescence intensity and to study the localisation of two chemotaxis proteins. The pC46 complementation vector contains coding sequence from cj0046, a C. jejuni NCTC11168 pseudo-gene and is used to integrate cloned genes onto the C. jejuni chromosome. The pC46 vector was used to construct plasmids containing iLOV, driven by three different C...
November 4, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/29106325/diarrheagenic-escherichia-coli-and-shigella-with-high-rate-of-extended-spectrum-beta-lactamase-production-two-predominant-etiological-agents-of-acute-diarrhea-in-shiraz-iran
#9
Maneli Aminshahidi, Amir Arastehfar, Gholamreza Pouladfar, Esmayil Arman, Fereshteh Fani
This study was conducted to find the etiology of acute diarrhea in Iranian children and determine the antimicrobial resistance patterns. The pathogenic bacteria were recovered from 110/269 (40.9%) diarrheal fecal samples with the following profiles: the most predominant pathogen was diarrheagenic Escherichia coli (DEC) (43.6%), comprising enteroaggregative E. coli (23.6%), enteropathogenic E. coli (10.9%), enteroinvasive E. coli (5.5%), and enterotoxigenic E. coli (3.6%); Shigella spp. (37.3%), Salmonella spp...
November 6, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/29099940/long-term-colonisation-by-campylobacter-jejuni-within-a-human-host-evolution-antimicrobial-resistance-and-adaptation
#10
Samuel J Bloomfield, Anne C Midwinter, Patrick J Biggs, Nigel P French, Jonathan C Marshall, David T S Hayman, Philip E Carter, Craig Thornley, Rudyard Yap, Jackie Benschop
Background: Campylobacteriosis is inflammation of the gastrointestinal tract as a result of Campylobacter infection. Most campylobacteriosis cases are acute and self-limiting, with Campylobacter excretion ceasing a few weeks after symptoms cease. We identified a patient who had tested faecally-positive for Campylobacter jejuni (ST45), intermittently for ten years. Methods: Sixteen Campylobacter isolates were collected from the patient from 2006-2016. The isolates' genomes were sequenced to determine their relatedness, and their antimicrobial susceptibility patterns and motility were measured to determine the effects of antibiotic therapy and long-term excretion on the Campylobacter...
November 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29093317/rapid-and-accurate-diagnosis-based-on-real-time-pcr-cycle-threshold-value-for-the-identification-of-campylobacter-jejuni-asta-gene-positive-escherichia-coli-and-eae-gene-positive-e-coli
#11
Jun Kawase, Hiroshi Asakura, Morito Kurosaki, Hitoshi Oshiro, Yoshiki Etoh, Tetsuya Ikeda, Masanori Watahiki, Mitsuhiro Kameyama, Fumi Hayashi, Yuta Kawakami, Yoshiko Murakami, Yoshie Tsunomori
  We previously developed a multiplex real-time PCR assay (Rapid Foodborne Bacterial Screening 24 ver.5, RFBS24 ver.5) for simultaneous detection of 24 foodborne bacterial targets. Here, to overcome the discrepancy of the RFBS24 ver.5 and bacterial culture method (BC) results, we analyzed 246 human clinical samples from 49 gastroenteritis outbreaks by the RFBS24 ver.5 and evaluated the correlation between cycle threshold value (CT) of RFBS24 ver.5 and the BC results. The results showed that the RFBS24 ver...
October 31, 2017: Japanese Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29091202/pointfinder-a-novel-web-tool-for-wgs-based-detection-of-antimicrobial-resistance-associated-with-chromosomal-point-mutations-in-bacterial-pathogens
#12
Ea Zankari, Rosa Allesøe, Katrine G Joensen, Lina M Cavaco, Ole Lund, Frank M Aarestrup
Background: Antibiotic resistance is a major health problem, as drugs that were once highly effective no longer cure bacterial infections. WGS has previously been shown to be an alternative method for detecting horizontally acquired antimicrobial resistance genes. However, suitable bioinformatics methods that can provide easily interpretable, accurate and fast results for antimicrobial resistance associated with chromosomal point mutations are still lacking. Methods: Phenotypic antimicrobial susceptibility tests were performed on 150 isolates covering three different bacterial species: Salmonella enterica, Escherichia coli and Campylobacter jejuni...
October 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29091080/campylobacter-jejuni-impairs-sodium-transport-and-epithelial-barrier-function-via-cytokine-release-in-human-colon
#13
R Bücker, S M Krug, V Moos, C Bojarski, M R Schweiger, M Kerick, A Fromm, S Janßen, M Fromm, N A Hering, B Siegmund, T Schneider, C Barmeyer, J D Schulzke
This corrects the article DOI: 10.1038/mi.2017.66.
November 1, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/29089931/physicochemical-factors-influence-the-abundance-and-culturability-of-human-enteric-pathogens-and-fecal-indicator-organisms-in-estuarine-water-and-sediment
#14
Francis Hassard, Anthony Andrews, Davey L Jones, Louise Parsons, Vera Jones, Brian A Cox, Peter Daldorph, Howard Brett, James E McDonald, Shelagh K Malham
To assess fecal pollution in coastal waters, current monitoring is reliant on culture-based enumeration of bacterial indicators, which does not account for the presence of viable but non-culturable or sediment-associated micro-organisms, preventing effective quantitative microbial risk assessment (QMRA). Seasonal variability in viable but non-culturable or sediment-associated bacteria challenge the use of fecal indicator organisms (FIOs) for water monitoring. We evaluated seasonal changes in FIOs and human enteric pathogen abundance in water and sediments from the Ribble and Conwy estuaries in the UK...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29089630/the-food-borne-pathogen-campylobacter-jejuni-depends-on-the-addab-dna-repair-system-to-defend-against-bile-in-the-intestinal-environment
#15
Christopher R Gourley, Nicholas M Negretti, Michael E Konkel
Accurate repair of DNA damage is crucial to ensure genome stability and cell survival of all organisms. Bile functions as a defensive barrier against intestinal colonization by pathogenic microbes. Campylobacter jejuni, a leading bacterial cause of foodborne illness, possess strategies to mitigate the toxic components of bile. We recently found that growth of C. jejuni in medium with deoxycholate, a component of bile, caused DNA damage consistent with the exposure to reactive oxygen species. We hypothesized that C...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29080090/flagellin-glycosylation-with-pseudaminic-acid-in-campylobacter-and-helicobacter-prospects-for-development-of-novel-therapeutics
#16
REVIEW
Abu Iftiaf Md Salah Ud-Din, Anna Roujeinikova
Many pathogenic bacteria require flagella-mediated motility to colonise and persist in their hosts. Helicobacter pylori and Campylobacter jejuni are flagellated epsilonproteobacteria associated with several human pathologies, including gastritis, acute diarrhea, gastric carcinoma and neurological disorders. In both species, glycosylation of flagellin with an unusual sugar pseudaminic acid (Pse) plays a crucial role in the biosynthesis of functional flagella, and thereby in bacterial motility and pathogenesis...
October 27, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29078764/an-intrinsically-disordered-linker-controlling-the-formation-and-the-stability-of-the-bacterial-flagellar-hook
#17
Clive S Barker, Irina V Meshcheryakova, Alla S Kostyukova, Peter L Freddolino, Fadel A Samatey
BACKGROUND: In a macro-molecular complex, any minor change may prove detrimental. For a supra-molecular nano-machine like the bacterial flagellum, which consists of several distinct parts with specific characteristics, stability is important. During the rotation of the bacterial flagellar motor, which is located in the membrane, the flagella rotate at speeds between 200 and 2000 rpm, depending on the bacterial species. The hook substructure of the bacterial flagellum acts as a universal joint connecting the motor to the flagellar filament...
October 27, 2017: BMC Biology
https://www.readbyqxmd.com/read/29077972/characterization-and-evaluation-of-lactic-acid-bacteria-candidates-for-intestinal-epithelial-permeability-and-salmonella-typhimurium-colonization-in-neonatal-turkey-poults
#18
Y Yang, J D Latorre, B Khatri, Y M Kown, B W Kong, K D Teague, L E Graham, A D Wolfenden, B D Mahaffey, M Baxter, X Hernandez-Velasco, R Merino-Guzman, B M Hargis, G Tellez
The present study evaluated the microbiological properties of three probiotic candidate strains of lactic acid bacteria (LAB) (128; 131; CE11_2), their effect on intestinal epithelial permeability, and their ability to reduce intestinal colonization of Salmonella Typhimurium (ST) individually or as a batch culture in neonatal turkey poults. Isolates were characterized morphologically and identified using 16S rRNA sequence analyses. Each isolate was evaluated for tolerance and resistance to acidic pH, high osmotic NaCl concentrations, and bile salts in broth medium...
October 25, 2017: Poultry Science
https://www.readbyqxmd.com/read/29076618/glycosylate-and-move-the-glycosyltransferase-maf-is-involved-in-bacterial-flagella-formation
#19
Gerlind Sulzenbacher, Véronique Roig-Zamboni, Régine Lebrun, Yann Guérardel, Dorothée Murat, Pascal Mansuelle, Nao Yamakawa, Xin-Xin Quian, Renaud Vincentelli, Yves Bourne, Long-Fei Wu, François Alberto
The flagella of various Gram-negative bacteria are decorated with diverse glycan structures, amongst them nonulosonic acids related to the sialic acid family. Although nonulosonic sugar biosynthesis pathways have been dissected in various pathogens, the enzymes transferring the sugars onto flagellin are still poorly characterized. The deletion of genes coding for Motility associated factors (Mafs) found in many pathogenic strains systematically gives rise to non-flagellated bacteria lacking specific nonulosonic sugars on the flagellins, therefore relating Maf function to flagellin glycosylation and bacterial motility...
October 27, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/29053280/structural-and-biochemical-investigation-of-pglf-from-campylobacter-jejuni-reveals-a-new-mechanism-for-a-member-of-the-short-chain-dehydrogenase-reductase-superfamily
#20
Alexander S Riegert, James B Thoden, Ian C Schoenhofen, David C Watson, N Martin Young, Peter A Tipton, Hazel M Holden
Within recent years it has become apparent that protein glycosylation is not limited to eukaryotes. Indeed, in Campylobacter jejuni, a Gram-negative bacterium, more than 60 of its proteins are known to be glycosylated. One of the sugars found in such glycosylated proteins is 2,4-diacetamido-2,4,6-trideoxy-α-d-glucopyranose, hereafter referred to as QuiNAc4NAc. The pathway for its biosynthesis, initiating with UDP-GlcNAc, requires three enzymes referred to as PglF, PglE, and PlgD. The focus of this investigation is on PglF, an NAD(+)-dependent sugar 4,6-dehydratase known to belong to the short chain dehydrogenase/reductase (SDR) superfamily...
November 3, 2017: Biochemistry
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