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Campylobacter jejuni

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https://www.readbyqxmd.com/read/28318296/administration-of-lactobacillus-johnsonii-fi9785-to-chickens-affects-colonisation-by-campylobacter-jejuni-and-the-intestinal-microbiota
#1
R Mañes-Lázaro, P M Van Diemen, C Pin, M J Mayer, M P Stevens, A Narbad
1. Campylobacter jejuni is the most common bacterial cause of human foodborne gastroenteritis in the world largely from contaminated poultry meat. New control measures to reduce or eliminate this pathogen from the animal gastrointestinal tract are urgently required, and the use of probiotics as competitive exclusion agents is a promising biocontrol measure to reduce C. jejuni in the food chain. 2. In this study, we assessed the potential of Lactobacillus johnsonii FI9785, which has shown efficacy against Clostridium perfringens, to combat C...
March 20, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28317494/pathogenic-potential-and-genotypic-diversity-of-campylobacter-jejuni-a-neglected-food-borne-pathogen-in-brazil
#2
Miliane Rodrigues Frazão, Marta Inês Cazentini Medeiros, Sheila da Silva Duque, Juliana Pfrimer Falcão
Purpose and methodology.Campylobacter jejuni is a major zoonotic pathogen that causes food-borne gastroenteritis worldwide. However, there are only a few studies available that have molecularly characterized C. jejuni strains isolated in Brazil. The aim of this study was to genotype 111 C. jejuni strains isolated from sick humans (43), monkey faeces (19), chicken faeces (14), chicken meat (33) and sewage (2) between 1996 and 2016 in Brazil using flaA-SVR (short variable region) sequencing and PFGE. Furthermore, the presence of 16 virulence genes was analysed by PCR...
March 20, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28316093/morphology-heterogeneity-within-a-campylobacter-jejuni-helical-population-the-use-of-calcofluor-white-to-generate-rod-shaped-c-jejuni-81-176-clones-and-the-genetic-determinants-responsible-for-differences-in-morphology-within-11168-strains
#3
Emilisa Frirdich, Jacob Biboy, Steven Huynh, Craig T Parker, Waldemar Vollmer, Erin C Gaynor
Campylobacter jejuni helical shape is important for colonization and host interactions with straight mutants having altered biological properties. Passage on calcofluor white (CFW) resulted in C. jejuni 81-176 isolates with morphology changes: either a straight morphology from frameshift mutations and single nucleotide polymorphisms in peptidoglycan hydrolase genes pgp1 or pgp2 or a reduction in curvature due a frameshift mutation in cjj81176_1105, a putative peptidoglycan endopeptidase. Shape defects were restored by complementation...
March 18, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28306506/crystal-structure-of-the-minimal-cas9-from-campylobacter-jejuni-reveals-the-molecular-diversity-in-the-crispr-cas9-systems
#4
Mari Yamada, Yuto Watanabe, Jonathan S Gootenberg, Hisato Hirano, F Ann Ran, Takanori Nakane, Ryuichiro Ishitani, Feng Zhang, Hiroshi Nishimasu, Osamu Nureki
The RNA-guided endonuclease Cas9 generates a double-strand break at DNA target sites complementary to the guide RNA and has been harnessed for the development of a variety of new technologies, such as genome editing. Here, we report the crystal structures of Campylobacter jejuni Cas9 (CjCas9), one of the smallest Cas9 orthologs, in complex with an sgRNA and its target DNA. The structures provided insights into a minimal Cas9 scaffold and revealed the remarkable mechanistic diversity of the CRISPR-Cas9 systems...
March 16, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28303130/new-approaches-on-quantification-of-campylobacter-jejuni-in-poultry-samples-the-use-of-digital-pcr-and-real-time-pcr-against-the-iso-standard-plate-count-method
#5
Bojan Papić, Mateja Pate, Urška Henigman, Urška Zajc, Igor Gruntar, Majda Biasizzo, Matjaž Ocepek, Darja Kušar
Campylobacteriosis is the most frequently reported bacterial food-borne illness in the European Union and contaminated broiler meat is considered the most important source of infection in humans. The aim of the present study was to evaluate real-time PCR (qPCR) and digital PCR (dPCR) for quantification of Campylobacter jejuni in 75 broiler neck-skin samples collected from a poultry slaughterhouse, and to compare them with the ISO 10272-2 standard plate count method. For qPCR standard curve, C. jejuni-negative neck-skin samples were spiked with C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28288714/bacteria-associated-with-marginal-zone-lymphomas
#6
REVIEW
Maurilio Ponzoni, Andrés J M Ferreri
In the last decades some bacteria have been associated with a various extent with marginal zone (extra nodal, nodal and splenic types) lymphomas are frequently associated with chronic infections, with important clinical, molecular, biological, and therapeutic implications. The well-known correlation between Helicobacter pylori and gastric MALT-lymphoma, the recently reported links between Chlamydia psittaci and ocular adnexal MALT-lymphoma and Borrelia burgdorferi and cutaneous MALT lymphoma constitute the most studied examples; in addition, Campylobacter jejuni and some more recent associations encompassing Achromobacter xylosoxidans and Haemophilus influenzae will be further reported...
March 2017: Best Practice & Research. Clinical Haematology
https://www.readbyqxmd.com/read/28286570/strain-specific-probiotic-properties-of-lactic-acid-bacteria-and-their-interference-with-human-intestinal-pathogens-invasion
#7
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/28282226/a-quantitative-real-time-pcr-approach-for-assessing-campylobacter-jejuni-and-campylobacter-coli-colonization-in-broiler-herds
#8
Katrin Haas, Gudrun Overesch, Peter Kuhnert
Human campylobacteriosis is a major public health concern in developed countries, with Campylobacter jejuni and Campylobacter coli from poultry recognized as the main source of human infection. Identification of Campylobacter-positive broiler herds before slaughter is essential for implementing measures to avoid carryover of pathogens via the slaughter process into the food chain. However, appropriate methods that have been validated for testing poultry flocks antemortem are lacking for Campylobacter. A quantitative real-time PCR (qPCR) that allows simultaneous detection and quantification of C...
March 10, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28282225/quantitative-microbial-risk-assessment-for-campylobacter-foodborne-illness-in-raw-beef-offal-consumption-in-south-korea
#9
Jiyeon Jeong, Jeeyeon Lee, Heeyoung Lee, Soomin Lee, Sejeong Kim, Jimyeong Ha, Ki-Sun Yoon, Yohan Yoon
This study evaluated the risk of Campylobacter foodborne illness caused by the intake of raw beef offal in South Korea. The prevalence of Campylobacter spp. in raw beef offal (liver and tripe) was investigated by plating samples on modified charcoal-cefoperazone-deoxycholate agar with Preston enrichment broth. Data were collected about storage temperature and length of storage of raw beef offal, and probabilistic distributions for the data were determined, using @RISK software. Predictive models were developed to describe the fate of Campylobacter in raw beef offal, and the amount and frequency of consumption and dose-response model were surveyed...
March 10, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28281647/analysis-of-campylobacter-jejuni-infection-in-the-gnotobiotic-piglet-and-genome-wide-identification-of-bacterial-factors-required-for-infection
#10
Stefan P W de Vries, Aileen Linn, Kareen Macleod, Amanda MacCallum, Simon P Hardy, Gill Douce, Eleanor Watson, Mark P Dagleish, Hal Thompson, Andy Stevenson, David Kennedy, Abiyad Baig, Chris Coward, Duncan J Maskell, David G E Smith, Andrew J Grant, Paul Everest
To investigate how Campylobacter jejuni causes the clinical symptoms of diarrhoeal disease in humans, use of a relevant animal model is essential. Such a model should mimic the human disease closely in terms of host physiology, incubation period before onset of disease, clinical signs and a comparable outcome of disease. In this study, we used a gnotobiotic piglet model to study determinants of pathogenicity of C. jejuni. In this model, C. jejuni successfully established infection and piglets developed an increased temperature with watery diarrhoea, which was caused by a leaky epithelium and reduced bile re-absorption in the intestines...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28271927/prevalence-of-pathogens-and-indicator-organisms-in-home-kitchens-and-correlation-with-unsafe-food-handling-practices-and-conditions
#11
Patricia A Borrusso, Jennifer J Quinlan
Despite education efforts, consumers often practice unsafe food handling and storage behaviors. Little is known about how these unsafe practices contribute to contamination of the home kitchen with foodborne pathogens. In addition, only a limited number of studies have examined the role of the kitchen as a reservoir for pathogens. The purpose of this study was to characterize microbial contamination and foodborne pathogens found in home kitchens and determine whether contamination was significantly associated with unsafe or unsanitary conditions observed in the kitchen...
March 8, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28264854/high-prevalence-and-predominance-of-the-aph-2%C3%A2-if-gene-conferring-aminoglycoside-resistance-in-campylobacter
#12
Hong Yao, Dejun Liu, Yang Wang, Qijing Zhang, Zhangqi Shen
Campylobacter is a major foodborne pathogen and previous studies revealed that Campylobacter isolates from food-producing animals are increasingly resistant to gentamicin in China. The molecular epidemiology and genetic mechanisms responsible for gentamicin resistance in China have not been well understood. In this study, 607 Campylobacter isolates of chicken and swine origins collected in the year of 2014 were analyzed, revealing that 15.6% (25/160) of the C. jejuni isolates and 79.9% (357/447) of the C. coli isolates were resistant to gentamicin...
March 6, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28263875/molecular-architecture-of-an-n-formyltransferase-from-salmonella-enterica-o60
#13
Colin R Woodford, James B Thoden, Hazel M Holden
N-formylated sugars are found on the lipopolysaccharides of various pathogenic Gram negative bacteria including Campylobacter jejuni 81116, Francisella tularensis, Providencia alcalifaciens O30, and Providencia alcalifaciens O40. The last step in the biosynthetic pathways for these unusual sugars is catalyzed by N-formyltransferases that utilize N(10)-formyltetrahydrofolate as the carbon source. The substrates are dTDP-linked amino sugars with the functional groups installed at either the C-3' or C-4' positions of the pyranosyl rings...
March 2, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28261296/gastrointestinal-disorders-next-to-respiratory-infections-as-leading-symptoms-of-x-linked-agammaglobulinemia-in-children-34-year-experience-of-a-single-center
#14
Malgorzata Pac, Ewa A Bernatowska, Jarosław Kierkuś, Józef P Ryżko, Joanna Cielecka-Kuszyk, Teresa Jackowska, Bożena Mikołuć
INTRODUCTION: Respiratory tract infections constitute the most frequent manifestation of X-linked agammaglobulinemia (XLA). There are not many papers elucidating gastrointestinal (GI) disorders, including inflammatory bowel disease (IBD), in such patients. The aim of the study was to evaluate the occurrence of gastrointestinal disorders and IBD compared to respiratory tract infections in XLA individuals. MATERIAL AND METHODS: Of 1563 patients with primary immunodeficiencies diagnosed in the Department of Immunology, the Children's Memorial Health Institute (CMHI), 66 boys had a provisional diagnosis of agammaglobulinemia...
March 1, 2017: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/28259232/guillain-barr%C3%A3-syndrome
#15
REVIEW
Eelco F M Wijdicks, Christopher J Klein
Guillain-Barré syndrome is an acute inflammatory immune-mediated polyradiculoneuropathy presenting typically with tingling, progressive weakness, and pain. Variants and formes frustes may complicate recognition. The best known variant is the sensory ataxic form of Miller Fisher syndrome, which also affects the oculomotor nerves and the brain stem. Divergent pathologic mechanisms lead to demyelinating, axonal, or mixed demyelinating-axonal damage. In the demyelinating form, yet to be identified antigens are inferred by complement activation, myelin destruction, and macrophage-activated cleanup...
March 2017: Mayo Clinic Proceedings
https://www.readbyqxmd.com/read/28250261/high-prevalence-of-campylobacter-ureolyticus-in-stool-specimens-of-children-with-diarrhea-in-japan
#16
Noritoshi Hatanaka, Akinori Shimizu, Srinuan Somroop, Yiming Li, Masahiro Asakura, Akira Nagita, Sharda Prasad Awasthi, Atsushi Hinenoya, Shinji Yamasaki
Campylobacter ureolyticus has been considered as a potential pathogenic bacterium. In this study, a total 586 stool samples were collected from 0-12 year-old children with diarrhea between November 2013 and April 2015 and examined with microbiological tests in the hospital for diagnosis of common enteric pathogens including C. jejuni and C. coli. Then in our laboratory, these samples were analyzed by 16S rRNA sequence-based Campylobacter genus-specific PCR (C16S PCR) and 283 (48.3%) samples show positive with this PCR assay...
February 28, 2017: Japanese Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28249998/whole-genome-sequencing-in-the-epidemiology-of-campylobacter-jejuni-infections
#17
Ann-Katrin Llarena, Eduardo Taboada, Mirko Rossi
This review provides the current state of knowledge on the application of whole-genome sequencing (WGS) in the epidemiology of Campylobacter jejuni, the leading cause of bacterial gastroenteritis worldwide. We describe how WGS has increased our understanding of the evolutionary and epidemiological dynamics of this pathogen and how WGS has the potential to improve surveillance and outbreak detection. We have identified hurdles towards the full implementation of WGS in public health settings. However, despite these challenges, we believe that ample evidence is available to support the benefit of integrating WGS in the routine monitoring of C...
March 1, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28243912/formation-of-biofilms-by-foodborne-pathogens-and-development-of-laboratory-in-vitro-model-for-the-study-of-campylobacter-genus-bacteria-based-on-these-biofilms
#18
N R Efimochkina, I B Bykova, Yu M Markova, Yu V Korotkevich, V V Stetsenko, L P Minaeva, S A Sheveleva
We analyzed the formation of biofilms by 7 strains of Campylobacter genus bacteria and 18 strains of Enterobacteriaceae genus bacteria that were isolated from plant and animal raw materials, from finished products, and swabs from the equipment of the food industry. Biofilm formation on glass plates, slides and coverslips, microtubes made of polymeric materials and Petri dishes, and polystyrene plates of different profiles were analyzed. When studying the process of films formation, different effects on bacterial populations were simulated, including variation of growth factor composition of culture media, technique of creating of anaerobiosis, and biocide treatment (active chlorine solutions in a concentration of 100 mg/dm(3))...
February 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28237599/prevalence-antimicrobial-resistance-and-molecular-characterization-of-campylobacter-spp-in-bulk-tank-milk-and-milk-filters-from-us-dairies
#19
Laura P Del Collo, Jeffrey S Karns, Debabrata Biswas, Jason E Lombard, Bradd J Haley, R Camilla Kristensen, Christine A Kopral, Charles P Fossler, Jo Ann S Van Kessel
Campylobacter spp. are frequently isolated from dairy cows as commensal organisms. Sporadic Campylobacter infections in humans in the United States are generally attributed to poultry, but outbreaks are also commonly associated with dairy products, particularly unpasteurized or raw milk. Bulk tank milk samples and milk filters from US dairy operations were collected during the National Animal Health Monitoring System Dairy 2014 study and analyzed using real-time PCR and traditional culture techniques for the presence of thermophilic Campylobacter species...
February 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28223978/function-and-regulation-of-the-c4-dicarboxylate-transporters-in-campylobacter-jejuni
#20
Marc M S M Wösten, Chris H A van de Lest, Linda van Dijk, Jos P M van Putten
C4-dicarboxylates are important molecules for the human pathogen C.jejuni, as they are used as carbon and electron acceptor molecules, as sugars cannot be utilized by this microaerophilic organism. Based on the genome analysis, C. jejuni may possess five different C4-dicarboxylate transporters: DctA, DcuA, DcuB, and two homologs of DcuC. Here, we investigated the regulation and function of various C4-dicarboxylate transporters in C. jejuni. Transcription of the dctA and dcuC homologs is constitutive, while dcuA and dcuB are both directly regulated by the two-component RacR/RacS system in response to limited oxygen availability and the presence of nitrate...
2017: Frontiers in Microbiology
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