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Campylobacter jejuni

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https://www.readbyqxmd.com/read/27915211/impact-of-waning-acquired-immunity-and-asymptomatic-infections-on-case-control-studies-for-enteric-pathogens
#1
Arie H Havelaar, Arno Swart
Case-control studies of outbreaks and of sporadic cases of infectious diseases may provide a biased estimate of the infection rate ratio, due to selecting controls that are not at risk of disease. We use a dynamic mathematical model to explore biases introduced in results drawn from case-control studies of enteric pathogens by waning and boosting of immunity, and by asymptomatic infections, using Campylobacter jejuni as an example. Individuals in the population are either susceptible (at risk of infection and disease), fully protected (not at risk of either) or partially protected (at risk of infection but not of disease)...
November 28, 2016: Epidemics
https://www.readbyqxmd.com/read/27912729/genomic-insights-from-whole-genome-sequencing-of-four-clonal-outbreak-campylobacter-jejuni-assessed-within-the-global-c-jejuni-population
#2
Clifford G Clark, Chrystal Berry, Matthew Walker, Aaron Petkau, Dillon O R Barker, Cai Guan, Aleisha Reimer, Eduardo N Taboada
BACKGROUND: Whole genome sequencing (WGS) is useful for determining clusters of human cases, investigating outbreaks, and defining the population genetics of bacteria. It also provides information about other aspects of bacterial biology, including classical typing results, virulence, and adaptive strategies of the organism. Cell culture invasion and protein expression patterns of four related multilocus sequence type 21 (ST21) C. jejuni isolates from a significant Canadian water-borne outbreak were previously associated with the presence of a CJIE1 prophage...
December 3, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27910897/genomic-variations-leading-to-alterations-in-cell-morphology-of-campylobacter-spp
#3
Diane Esson, Alison E Mather, Eoin Scanlan, Srishti Gupta, Stefan P W de Vries, David Bailey, Simon R Harris, Trevelyan J McKinley, Guillaume Méric, Sophia K Berry, Pietro Mastroeni, Samuel K Sheppard, Graham Christie, Nicholas R Thomson, Julian Parkhill, Duncan J Maskell, Andrew J Grant
Campylobacter jejuni, the most common cause of bacterial diarrhoeal disease, is normally helical. However, it can also adopt straight rod, elongated helical and coccoid forms. Studying how helical morphology is generated, and how it switches between its different forms, is an important objective for understanding this pathogen. Here, we aimed to determine the genetic factors involved in generating the helical shape of Campylobacter. A C. jejuni transposon (Tn) mutant library was screened for non-helical mutants with inconsistent results...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27908990/draft-genome-sequences-of-campylobacter-jejuni-strains-that-cause-abortion-in-livestock
#4
Allison M Weis, Kristin A Clothier, Bihua C Huang, Nguyet Kong, Bart C Weimer
Campylobacter jejuni is an intestinal bacterium that can cause abortion in livestock. This publication announces the public release of 15 Campylobacter jejuni genome sequences from isolates linked to abortion in livestock. These isolates are part of the 100K Pathogen Genome Project and are from clinical cases at the University of California (UC) Davis.
December 1, 2016: Genome Announcements
https://www.readbyqxmd.com/read/27903324/epidemiological-and-serological-investigation-of-a-waterborne-campylobacter-jejuni-outbreak-in-a-danish-town
#5
K Gaardbo Kuhn, G Falkenhorst, H-D Emborg, T Ceper, M Torpdahl, K A Krogfelt, S Ethelberg, K Mølbak
Following an unusually heavy rainfall in June 2009, a community-wide outbreak of Campylobacter gastroenteritis occurred in a small Danish town. The outbreak investigation consisted of (1) a cohort study using an e-questionnaire of disease determinants, (2) microbiological study of stool samples, (3) serological study of blood samples from cases and asymptomatic members of case households, and (4) environmental analyses of the water distribution system. The questionnaire study identified 163 cases (respondent attack rate 16%)...
December 1, 2016: Epidemiology and Infection
https://www.readbyqxmd.com/read/27900889/campylobacter-jejuni-strains-coresistant-to-tetracycline-and-ciprofloxacin-in-patients-with-gastroenteritis-in-croatia
#6
Merica Carev, Ana Kovačić, Anita Novak, Marija Tonkić, Ana Jerončić
BACKGROUND: Antibiotic-resistant Campylobacter jejuni strains are rapidly emerging worldwide. Here, we aimed to determine the antibiotic-resistance patterns and genetic structure of C. jejuni from stool samples of symptomatic patients in Dalmatia, the largest Croatian county. METHODS: In a population-based laboratory surveillance programme for campylobacteriosis in Dalmatia from May 2012 to May 2013, C. jejuni (n = 76) were collected from stool samples of all the patients hospitalized with gastroenteritis and matched positive outpatients (n = 77)...
November 30, 2016: Infectious Diseases
https://www.readbyqxmd.com/read/27899145/bibliometric-analysis-of-publications-on-campylobacter-2000-2015
#7
Waleed M Sweileh, Samah W Al-Jabi, Ansam F Sawalha, Adham S AbuTaha, Sa'ed H Zyoud
BACKGROUND: Campylobacter species are widespread zoonotic pathogens. Campylobacter jejuni causes a form of gastroenteritis called campylobacteriosis. Campylobacter drug resistance is considered a serious threat. In order to better understand national and international research output on Campylobacter, we conducted this bibliometric overview of publications on Campylobacter. This study can be used to assess extent of interaction and response of researchers, food regulators, and health policy makers to global burden of campylobacateriosis...
November 29, 2016: Journal of Health, Population, and Nutrition
https://www.readbyqxmd.com/read/27891184/effect-of-antibiotic-pre-treatment-and-pathogen-challenge-on-the-intestinal-microbiota-in-mice
#8
Tadasu Iizumi, Takako Taniguchi, Wataru Yamazaki, Geraldine Vilmen, Alexander V Alekseyenko, Zhan Gao, Guillermo I Perez Perez, Martin J Blaser
BACKGROUND: More than 50 years after the discovery of antibiotics, bacterial infections have decreased substantially; however, antibiotics also may have negative effects such as increasing susceptibility to pathogens. An intact microbiome is an important line of defense against pathogens. We sought to determine the effect of orally administered antibiotics both on susceptibility to pathogens and on impact to the microbiome. We studied Campylobacter jejuni, one of the most common causes of human diarrhea, and Acinetobacter baumannii, which causes wound infections...
2016: Gut Pathogens
https://www.readbyqxmd.com/read/27889154/prevalence-and-quantification-of-thermophilic-campylobacter-spp-in-italian-retail-poultry-meat-analysis-of-influencing-factors
#9
Simone Stella, Gabriella Soncini, Graziella Ziino, Antonio Panebianco, Francesca Pedonese, Roberta Nuvoloni, Elisabetta Di Giannatale, Giampaolo Colavita, Leonardo Alberghini, Valerio Giaccone
Retail poultry meat is a crucial vehicle for consumers' exposure to Campylobacters, but no official controls are currently applied in Italy. The aim of this study was the evaluation of Campylobacter contamination of a wide range of poultry meats marketed in Italy. N. 472 chicken and turkey meat samples (sectioned meats, offal, meat preparations and products) were taken from slaughterhouses, deboning plants and different retailers and submitted to detection/enumeration of Campylobacter spp. The isolates were identified by phenotypic and biomolecular techniques...
April 2017: Food Microbiology
https://www.readbyqxmd.com/read/27888275/acute-disseminated-encephalomyelitis-following-campylobacter-jejuni-gastroenteritis-case-report-and-review-of-the-literature
#10
Simone Marziali, Eliseo Picchi, Francesca Di Giuliano, Simone Altobelli, Giorgia Mataluni, Girolama Marfia, Francesco Garaci, Roberto Floris
We describe a case of a 25-year-old male with a diagnosis of acute disseminated encephalomyelitis (ADEM) following infection with Campylobacter jejuni, which is implicated in various human pathologies regarding the central nervous system (CNS) with acute course like Guillain-Barré syndrome (GBS), Miller-Fisher syndrome (MFS), Bickerstaff's brainstem encephalitis (BEE), acute transverse myelitis (ATM) as well as ADEM. These conditions are caused by cross-reactivity between Campylobacter's epitopes and cells of the CNS that causes an immunomediated inflammatory demyelination of the CNS...
November 25, 2016: Neuroradiology Journal
https://www.readbyqxmd.com/read/27886034/antibiotic-resistance-profiles-of-campylobacter-species-in-the-south-africa-private-health-care-sector
#11
Christiana O Shobo, Linda Antionette Bester, Sooraj Baijnath, Anou M Somboro, Abdool K C Peer, Sabiha Y Essack
INTRODUCTION: There is a dearth of surveillance data on clinical Campylobacter in South Africa, particularly in the private healthcare environment. We investigated the prevalence of resistance to first-line antibiotics used to treat campylobacterioses in clinical Campylobacter isolates from a private pathology laboratory. METHODOLOGY: Identification of the Campylobacter specific genes were confirmed by PCR. Minimum inhibitory concentrations were determined using the broth micro-dilution method against macrolides (erythromycin, azithromycin), fluoroquinolones (ciprofloxacin, gatifloxacin) and tetracycline...
November 24, 2016: Journal of Infection in Developing Countries
https://www.readbyqxmd.com/read/27885613/generation-and-screening-of-an-insertion-sequencing-compatible-mutant-library-of-campylobacter-jejuni
#12
Jeremiah G Johnson, Victor J DiRita
The advent of next-generation sequencing technology has enabled experimental approaches to characterize large, complex populations of DNA molecules with high resolution. Included among these are methods to assess populations of transposon insertion libraries for the fitness cost of any particular mutant allele after applying selection to a population. These approaches have proven invaluable for identifying genetic factors that influence survival of bacterial pathogens within different environments, including animal hosts...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27885612/analyzing-prokaryotic-rna-seq-data-a-case-study-identifying-holo-fur-regulated-genes-in-campylobacter-jejuni
#13
Sophie Bérubé, James Butcher, Alain Stintzi
In recent years, RNA-seq has become an important method in the process of measuring gene expression in various cells and organisms. This chapter will detail all the bioinformatic steps that should be undertaken to determine differentially expressed genes from a typical RNA-seq experiment. Each step will be clearly explained in "non-bioinformatic" terminology so that readers embarking on RNA-seq analysis will be able to understand the rationale and reasoning behind each step. Moreover, the exact command lines used to process the data will be presented along with a description of the various flags and commands...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27885611/methods-for-proteome-analysis-of-campylobacter-jejuni-using-2-d-electrophoresis
#14
Ramila C Rodrigues, Nabila Haddad, Odile Tresse
This chapter describes protocols used for two-dimensional electrophoretic analysis of the proteome or subproteome of Campylobacter jejuni, a major human food-borne pathogen. The following protocols, adapted to Campylobacter strains, include all the steps from cultivation to gel-support protein separation.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27885610/characterizing-glycoproteins-by-mass-spectrometry-in-campylobacter-jejuni
#15
Nichollas E Scott
The glycosylation systems of Campylobacter jejuni (C. jejuni) are considered archetypal examples of both N- and O-linked glycosylations in the field of bacterial glycosylation. The discovery and characterization of these systems both have revealed important biological insight into C. jejuni and have led to the refinement and enhancement of methodologies to characterize bacterial glycosylation. In general, mass spectrometry-based characterization has become the preferred methodology for the study of C. jejuni glycosylation because of its speed, sensitivity, and ability to enable both qualitative and quantitative assessments of glycosylation events...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27885609/methods-for-genome-wide-methylome-profiling-of-campylobacter-jejuni
#16
Kathy T Mou, Tyson A Clark, Usha K Muppirala, Andrew J Severin, Paul J Plummer
Methylation has a profound role in the regulation of numerous biological processes in bacteria including virulence. The study of methylation in bacteria has greatly advanced thanks to next-generation sequencing technologies. These technologies have expedited the process of uncovering unique features of many bacterial methylomes such as characterizing previously uncharacterized methyltransferases, cataloging genome-wide DNA methylations in bacteria, identifying the frequency of methylation at particular genomic loci, and revealing regulatory roles of methylation in the biology of various bacterial species...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27885608/metabolomic-analysis-of-campylobacter-jejuni-by-direct-injection-electrospray-ionization-mass-spectrometry
#17
Robert M Howlett, Matthew P Davey, David J Kelly
Direct-injection mass spectrometry (DIMS) is a means of rapidly obtaining metabolomic phenotype data in both prokaryotes and eukaryotes. Given our generally poor understanding of Campylobacter metabolism, the high-throughput and relatively simple sample preparation of DIMS has made this an attractive technique for metabolism-related studies and hypothesis generation, especially when attempting to analyze metabolic mutants with no clear phenotype. Here we describe a metabolomic fingerprinting approach with sampling and extraction methodologies optimized for direct-injection electrospray ionization mass spectrometry (ESI-MS), which we have used as a means of comparing wild-type and isogenic mutant strains of C...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27885607/mouse-models-for-campylobacter-jejuni-colonization-and-infection
#18
Martin Stahl, Franziska A Graef, Bruce A Vallance
Relevant animal models for Campylobacter jejuni infection have been difficult to establish due to C. jejuni's inability to cause disease in many common animal research models. Fortunately, recent work has proven successful in developing several new and relevant mouse models of C. jejuni infection, including the SIGIRR-deficient mouse strain that develops acute enterocolitis in response to C. jejuni. Here we describe how to properly infect mice with C. jejuni, as well as a number of accompanying histological techniques to aid in studying C...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27885606/using-galleria-mellonella-as-an-infection-model-for-campylobacter-jejuni-pathogenesis
#19
Momen Askoura, Alain Stintzi
Nonmammalian model systems of infection have been employed recently to study bacterial virulence. For instance, Galleria mellonella (the greater wax moth) has been shown to be susceptible to infection by many bacterial pathogens including the enteric pathogen Campylobacter jejuni. In contrast to the traditional animal models for C. jejuni such as the chick colonization model and ferret diarrheal model, the Galleria mellonella infection model has the advantages of lower cost, ease of use and no animal breeding is required...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27885605/characterization-of-ligand-receptor-interactions-chemotaxis-biofilm-cell-culture-assays-and-animal-model-methodologies
#20
Rebecca M King, Victoria Korolik
Chemotactic motility is an essential virulence factor for the pathogenesis of Campylobacter spp. infection. In Chapter 6 , we described technologies that enable initial screening and identification of ligands able to interact with chemoreceptor sensory domains. These include amino acid and glycan arrays, NMR, and SPR that are utilized to identify potential ligands interacting with Campylobacter jejuni. Here we describe techniques that enable the characterization and evaluation of ligand-receptor binding in chemotaxis through the assessment of motility and directed chemotactic motility as well as the associated phenotypes-autoagglutination behavior, biofilm formation, ability to adhere and invade cultured mammalian cells, and colonization ability in avian hosts...
2017: Methods in Molecular Biology
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