Publications

growth of campylobacter jejuni supported by respiration of fumarate, nitrate, nitrite, trimethylamine-n-oxide, or dimethyl sulfoxide requires oxygen.	the human gastrointestinal pathogen campylobacter jejuni is a microaerophilic bacterium with a respiratory metabolism. the genome sequence of c. jejuni strain 11168 reveals the presence of genes that encode terminal reductases that are predicted to allow the use of a wide range of alternative electron acceptors to oxygen, including fumarate, nitrate, nitrite, and n- or s-oxides. all of these reductase activities were present in cells of strain 11168, and the molybdoenzyme encoded by cj0264c was ...	2002	12107136
survival of campylobacter jejuni in biofilms isolated from chicken houses.	campylobacter jejuni is a thermophilic and microaerophilic enteric pathogen associated with poultry. biofilms may be a source of c. jejuni in poultry house water systems since they can protect constituent microorganisms from environmental stress. in this study, the viability of c. jejuni in biofilms of gram-positive chicken house isolates (p1, y1, and w1) and a pseudomonas sp. was determined using a cultural method (modified brucella agar) and direct viable count (dvc). two-day biofilms grown on ...	2002	12117243
effectiveness of chemical sanitizers against campylobacter jejuni-containing biofilms.	survival of campylobacter jejuni in mixed-culture biofilms was determined after treatment with chemical sanitizers including chlorine, quaternary ammonia, peracetic acid (paa), and a paa/peroctanoic acid mixture (paa/poa). biofilm-producing bacteria (gram-positive rods, y1 and w1) were isolated from chicken house nipple drinkers. a meat plant isolate (pseudomonas sp.) was also included as a biofilm producer. two-day-old biofilms grown on polyvinyl chloride (pvc) plastic coupons in r2a broth at 1 ...	2002	12117244
generation and characterization of human monoclonal scfv antibodies against helicobacter pylori antigens.	infection with helicobacter pylori is chronic despite a vigorous cellular and humoral immune response and causes severe pathology in some patients. in this study, phage display was used as a new approach in order to investigate the role of the host's humoral immune response in the pathogenesis of h. pylori gastritis. human monoclonal single-chain fv (scfv) antibody fragments against h. pylori cell lysate and the h. pylori urease were isolated from an immune phage display library, constructed fro ...	2002	12117924
characterization of pit, a streptococcus pneumoniae iron uptake abc transporter.	bacteria frequently have multiple mechanisms for acquiring iron, an essential micronutrient, from the environment. we have identified a four-gene streptococcus pneumoniae operon, named pit, encoding proteins with similarity to components of a putative brachyspira hyodysenteriae iron uptake abc transporter, bit. an s. pneumoniae strain containing a defined mutation in pit has impaired growth in medium containing the iron chelator ethylenediamine di-o-hydroxyphenylacetic acid, reduced sensitivity ...	2002	12117949
outbreak of campylobacter jejuni infections associated with drinking unpasteurized milk procured through a cow-leasing program--wisconsin, 2001.	on december 7, 2001, the sawyer county department of health and human services in northwestern wisconsin notified the wisconsin division of public health about five cases of campylobacter jejuni enteritis. all of the ill persons drank unpasteurized milk obtained at a local dairy farm. this report summarizes the investigation of these and other cases and of a cow-leasing program used to circumvent regulations prohibiting the sale of unpasteurized milk in wisconsin. the outbreak highlights the haz ...	2002	12118535
clinical dysentery in hospitalized children.	clinical dysentery is a severe presentation of an enteric infection. the aim of the study was to evaluate the impact of a serious bacterial etiology in clinical dysentery in hospitalized children and determine if children at high risk can be identified on the basis of clinical or laboratory parameters.	2002	12120936
detection of cytolethal distending toxin activity and cdt genes in actinobacillus actinomycetemcomitans isolates from geographically diverse populations.	a cytolethal distending toxin (cdt) found in actinobacillus actinomycetemcomitans inhibits the eukaryotic cell cycle, which may contribute to the pathogenic potential of the bacterium. the presence of the cdtabc genes and cdt activity were examined in 40 clinical isolates of a. actinomycetemcomitans from brazil, kenya, japan and sweden. thirty-nine of 40 cell lysates caused distension of chinese hamster ovary cells. at least one of the cdt genes was detected in all strains examined. the three cd ...	2002	12121473
kinetics of kb and hep-2 cell responses to an invasive, cytolethal distending toxin-producing strain of actinobacillus actinomycetemcomitans.	the periodontal pathogen actinobacillus actinomycetemcomitans produces cytolethal distending toxin (cdt), a complex multicomponent toxin that arrests the growth of many types of eukaryotic cell. the kinetics of the effects of cdt-containing extracts, from an invasive strain of this bacterium, were examined on epithelial-like cells routinely used in invasion studies. both kb and hep-2 cells were exquisitely sensitive to the effects of the cdt with td50 of 30 and 300 pg of total bacterial protein, ...	2002	12121475
helicobacter pylori induces apoptosis of rat gastric parietal cells.	gastric helicobacter pylori infection may lead to multifocal atrophic corpus gastritis associated with loss of epithelial cells as well as glandular structures. the current work investigated h. pylori effects on cell death of isolated, nontransformed rat parietal cells (pc). highly enriched rat pc (>97%) were isolated from gastric mucosa and cultured in serum-free medium over 24 h. the cells were cocultured over 8 h with cytotoxin-associated immunodominant protein (caga)(+)/vacuolating toxin (va ...	2002	12121877
gyra polymorphism in campylobacter jejuni: detection of gyra mutations in 162 c. jejuni isolates by single-strand conformation polymorphism and dna sequencing.	mutations in the quinolone resistance-determining region of the gyra gene from 138 ciprofloxacin-resistant (mic, > or =4 microg/ml) and 24 ciprofloxacin-susceptible (mic, < or =1 microg/ml) clinical campylobacter jejuni isolates were subjected to single-strand conformation polymorphism analysis and sequencing. all of the isolates could be assigned to three genotypic clusters based on silent mutations. all resistant isolates had a point mutation at codon 86.	2002	12121947
multifocal motor neuropathy and campylobacter jejuni reactivity.	in some patients, campylobacter jejuni infection has been associated with the development of multifocal motor neuropathy (mmn) and high titers of antiganglioside antibodies. the authors measured anti-c. jejuni antibodies by elisa and immunoblot in 20 patients with mmn, and correlated their presence with antiganglioside reactivity and a history of recent diarrhea. only one patient had high titers of anti-c. jejuni antibodies, indicating that c. jejuni is unlikely to be involved in the pathogenesi ...	2002	12136073
regulation of riboflavin biosynthesis and transport genes in bacteria by transcriptional and translational attenuation.	the riboflavin biosynthesis in bacteria was analyzed using comparative analysis of genes, operons and regulatory elements. a model for regulation based on formation of alternative rna structures involving the rfn elements is suggested. in gram-positive bacteria including actinomycetes, thermotoga, thermus and deinococcus, the riboflavin metabolism and transport genes are predicted to be regulated by transcriptional attenuation, whereas in most gram-negative bacteria, the riboflavin biosynthesis ...	2002	12136096
suppressive subtractive hybridization detects extensive genomic diversity in thermotoga maritima.	comparisons between genomes of closely related bacteria often show large variations in gene content, even between strains of the same species. such studies have focused mainly on pathogens; here, we examined thermotoga maritima, a free-living hyperthermophilic bacterium, by using suppressive subtractive hybridization. the genome sequence of t. maritima msb8 is available, and dna from this strain served as a reference to obtain strain-specific sequences from thermotoga sp. strain rq2, a very clos ...	2002	12142418
genome-wide transcriptional profiling in a histidine kinase mutant of helicobacter pylori identifies members of a regulon.	to identify putative members of a regulon controlled by the h. pylori sensory histidine kinase hp0164 (hk0164), we constructed hk0164 null mutant h. pylori strains and analyzed bacterial gene transcription using dna arrays. seven genes were differentially expressed in multiple hk0164 mutant strains compared to their expression in control strains. strain-dependent variations in differential expression were also detected. these results indicate that the signal transduction circuit utilizing hk0164 ...	2002	12142435
crystal structure of an mrna-binding fragment of moorella thermoacetica elongation factor selb.	selb is an elongation factor needed for the co-translational incorporation of selenocysteine. selenocysteine is coded by a uga stop codon in combination with a specific downstream mrna hairpin. in bacteria, the c-terminal part of selb recognizes this hairpin, while the n-terminal part binds gtp and trna in analogy with elongation factor tu (ef-tu). we present the crystal structure of a c-terminal fragment of selb (selb-c) from moorella thermoacetica at 2.12 a resolution, solved by a combination ...	2002	12145214
helicobacter pylori impairs dna mismatch repair in gastric epithelial cells.	helicobacter pylori infection is a major gastric cancer risk factor. h. pylori gastritis occurs more frequently in individuals with microsatellite instability-positive than those with microsatellite instability-negative gastric cancers, raising the possibility that h. pylori infection affects dna mismatch repair (mmr). the aim of this study was to determine the effect of h. pylori on the expression of dna mmr proteins and rna in gastric epithelial cells.	2002	12145807
the peptidyl-prolyl isomerase motif is lacking in pmpa, the prsa-like protein involved in the secretion machinery of lactococcus lactis.	the prsa-like gene from lactococcus lactis encoding its single homologue to prsa, an essential protein triggering the folding of secreted proteins in bacillus subtilis, was characterized. this gene, annotated pmpa, encodes a lipoprotein of 309 residues whose expression is increased 7- to 10-fold when the source of nitrogen is limited. a slight increase in the expression of the prsa-like protein (plp) in l. lactis removed the degradation products previously observed with the staphylococcus hyicus ...	2002	12147493
combined use of two genetic fingerprinting methods, pulsed-field gel electrophoresis and ribotyping, for characterization of escherichia coli o157 isolates from food animals, retail meats, and cases of human disease.	two genetic fingerprinting techniques, pulsed-field gel electrophoresis (pfge) and ribotyping, were used to characterize 207 escherichia coli o157 isolates from food animals, foods of animal origin, and cases of human disease (206 of the isolates were from the united kingdom). in addition, 164 of these isolates were also phage typed. the isolates were divided into two general groups: (i) unrelated isolates not known to be epidemiologically linked (n = 154) and originating from food animals, food ...	2002	12149334
molecular epidemiology of caliciviruses causing outbreaks and sporadic cases of acute gastroenteritis in spain.	the molecular epidemiology of human caliciviruses (hucvs) causing sporadic cases and outbreaks of acute gastroenteritis around eastern spain (catalonia and the valencian community) was studied by reverse transcription-pcr (rt-pcr) and by sequencing part of the rna polymerase gene in open reading frame 1. hucvs were detected in 44 of 310 stool specimens (14.19%) negative for other enteric pathogens obtained from children with acute gastroenteritis. norwalk-like viruses (nlvs) were the most common ...	2002	12149342
hypogammaglobulinaemia: cumulative experience in 49 patients in a tertiary care institution.	in this paper, clinical data of 49 adult patients with agammaglobulinaemia (syn. hypogammaglobulinaemia), 15 cases of x-linked agammaglobulinaemia (xla) and 34 of common variable immunodeficiency (cvid) are reviewed. although immunoglobulin substitution largely abolished life-threatening respiratory tract infections, considerable infectious and non-infectious morbidity was still encountered in these patients. almost all patients suffered from chronic or recurrent upper and lower airway infection ...	2002	12164371
occupational health and safety in small animal veterinary practice: part i--nonparasitic zoonotic diseases.	zoonotic diseases are an ever-present concern in small animal veterinary practice and are often overlooked. a variety of nonparasitic zoonotic diseases may be encountered in small animal practice, including cat scratch disease (bartonellosis), cat bite abscesses, rabies, leptospirosis, methicillin-resistant staphylococcus aureus, clostridium difficile-associated diarrhea, salmonellosis, avian chlamydiosis, campylobacteriosis, dermatophytosis, and blastomycosis. these may cause human disease rang ...	2002	12170843
pervasive properties of the genomic signature.	the dinucleotide relative abundance profile can be regarded as a genomic signature because, despite diversity between species, it varies little between 50 kilobase or longer windows on a given genome. both the causes and the functional significance of this phenomenon could be illuminated by determining if it persists on smaller scales. the profile is computed from the base step "odds ratios" that compare dinucleotide frequencies to those expected under the assumption of stochastic equilibrium (t ...	2002	12171605
evidence that plant-like genes in chlamydia species reflect an ancestral relationship between chlamydiaceae, cyanobacteria, and the chloroplast.	an unusually high proportion of proteins encoded in chlamydia genomes are most similar to plant proteins, leading to proposals that a chlamydia ancestor obtained genes from a plant or plant-like host organism by horizontal gene transfer. however, during an analysis of bacterial-eukaryotic protein similarities, we found that the vast majority of plant-like sequences in chlamydia are most similar to plant proteins that are targeted to the chloroplast, an organelle derived from a cyanobacterium. we ...	2002	12176923
peptide linkage mapping of the agrobacterium tumefaciens vir-encoded type iv secretion system reveals protein subassemblies.	numerous bacterial pathogens use type iv secretion systems (t4ss) to deliver virulence factors directly to the cytoplasm of plant, animal, and human host cells. here, evidence for interactions among components of the agrobacterium tumefaciens vir-encoded t4ss is presented. the results derive from a high-resolution yeast two-hybrid assay, in which a library of small peptide domains of t4ss components was screened for interactions. the use of small peptides overcomes problems associated with assay ...	2002	12177441
flaa-like sequences containing internal termination codons (tag) in urease-positive thermophilic campylobacter isolated in japan.	to demonstrate two flaa-like sequences containing two internal termination codons (tag) in two japanese strains of urease-positive thermophilic campylobacter (uptc).	2002	12180938
prevalence of thermophilic campylobacter spp. in ready-to-eat foods and raw poultry in northern ireland.	although there have been numerous studies investigating the prevalence of campylobacters in animals and raw meats, there are limited data on the persistence of these organisms in ready-to-eat (rte) foodstuffs. although poultry is now well established as a major reservoir of thermophilic campylobacters, it is widely assumed that hazard analysis critical control point (haccp) controls in commercial and industrial settings are effective in eliminating this hazard through thorough cooking of rte pro ...	2002	12182488
the regulator perr is involved in oxidative stress response and iron homeostasis and is necessary for full virulence of streptococcus pyogenes.	ferric uptake regulator (fur) and fur-like proteins form an important family of transcriptional regulators in many bacterial species. in this work we have characterized a fur-like protein, the peroxide regulator perr, in an m1 serotype of streptococcus pyogenes. to determine the role of perr in s. pyogenes, we inactivated the gene by allelic replacement. perr-deficient bacteria showed 48% reduction of (55)fe incorporation from the culture medium. transcriptional analysis revealed that mtsa, enco ...	2002	12183543
tolerance to self gangliosides is the major factor restricting the antibody response to lipopolysaccharide core oligosaccharides in campylobacter jejuni strains associated with guillain-barré syndrome.	guillain-barré syndrome following campylobacter jejuni infection is frequently associated with anti-ganglioside autoantibodies mediated by molecular mimicry with ganglioside-like oligosaccharides on bacterial lipopolysaccharide (lps). the regulation of antibody responses to these t-cell-independent antigens is poorly understood, and only a minority of campylobacter-infected individuals develop anti-ganglioside antibodies. this study investigates the response to gangliosides and lps in strains of ...	2002	12183547
ganglioside mimicry of campylobacter jejuni lipopolysaccharides determines antiganglioside specificity in rabbits.	the core oligosaccharides of campylobacter jejuni lipopolysaccharides (lps) display molecular mimicry with gangliosides. cross-reactive anti-lps-antiganglioside antibodies have been implicated to show a crucial role in the pathogenesis of the guillain-barré and miller fisher syndrome. the specificity of the antiganglioside response is thought to depend on the oligosaccharide structure of the ganglioside mimic. to test this hypothesis and to investigate the potential of lps from campylobacter str ...	2002	12183556
campylobacter jejuni from patients with guillain-barré syndrome preferentially expresses a gd(1a)-like epitope.	gm(1)- and gd(1a)-like ganglioside mimicry in campylobacter jejuni lipooligosaccharide (los) is considered to be involved in the pathogenesis of campylobacter-induced guillain-barré syndrome (gbs). compared with gastroenteritis-related isolates, gbs-related c. jejuni isolates were strongly associated with the expression of gd(1a)-like mimicry. the presence of a few genes involved in los ganglioside mimicry, cst-ii, cgta, and cgtb, was also associated with gbs-related strains. gd(1a)-like epitope ...	2002	12183587
structure of the n-linked glycan present on multiple glycoproteins in the gram-negative bacterium, campylobacter jejuni.	mass spectrometry investigations of partially purified campylobacter jejuni protein peb3 showed it to be partially modified with an asn-linked glycan with a mass of 1406 da and composed of one hexose, five n-acetylhexosamines and a species of mass 228 da, consistent with a trideoxydiacetamidohexose. by means of soybean lectin affinity chromatography, a mixture of glycoproteins was obtained from a glycine extract, and two-dimensional gel proteomics analysis led to the identification of at least 2 ...	2002	12186869
a novel cell entry pathway for a daf-using human enterovirus is dependent on lipid rafts.	the glycosylphosphatidylinositol (gpi)-anchored complement regulatory protein decay-accelerating factor (daf) is used by a number of enteroviruses as a receptor during infection. daf and other gpi-anchored proteins can be found in cholesterol-rich ordered domains within the plasma membrane that are known as "lipid rafts." we have shown, by using drugs to specifically inhibit various endocytosis routes, that infection by a daf-using strain of echovirus 11 (ev11) is dependent upon cholesterol and ...	2002	12186914
a case-case comparison of campylobacter coli and campylobacter jejuni infection: a tool for generating hypotheses.	preventing campylobacteriosis depends on a thorough understanding of its epidemiology. we used case-case analysis to compare cases of campylobacter coli infection with cases of c. jejuni infection, to generate hypotheses for infection from standardized, population-based sentinel surveillance information in england and wales. persons with c. coli infection were more likely to have drunk bottled water than were those with c. jejuni infection and, in general, were more likely to have eaten pâté. im ...	2002	12194770
molecular characterization of campylobacter jejuni clones: a basis for epidemiologic investigation.	a total of 814 isolates of the foodborne pathogen campylobacter jejuni were characterized by multilocus sequence typing (mlst) and analysis of the variation of two cell-surface components: the heat-stable (hs) serotyping antigen and the flagella protein flaa short variable region. we identified 379 combinations of the mlst loci (sequence types) and 215 combinations of the cell-surface components among these isolates, which had been obtained from human disease, animals, food, and the environment. ...	2002	12194772
response of intestinal epithelial cells to trichuris suis excretory-secretory products and the influence on campylobacter jejuni invasion under in vitro conditions.	we previously developed a swine animal model in which natural host resistance to campylobacter jejuni is altered by experimental infection with low numbers of the nematode trichuris suis. pigs naturally colonized with c. jejuni experience colitis because of the invasion of the bacterium approximately 21 days after exposure to t. suis. to better understand the mechanism of t. suis-dependent c. jejuni colitis, we evaluated the effects of t. suis excretory-secretory products (esps) on intestinal ep ...	2002	12197123
from the farm to the kitchen table: the negative impact of antimicrobial use in animals on humans.	antimicrobials used as growth promotion agents in the livestock and poultry industries appear to result in the spread of drug-resistant pathogens to humans such as vancomycin-resistant enterococci, fluoroquinolone-resistant campylobacter jejuni, and multidrug-resistant strains of salmonella enterica. we present some epidemiologic evidence supporting this link and suggest that the use of antimicrobial agents for nontherapeutic purposes in food animals should be severely limited, if not banned alt ...	2002	12199302
environmental regulation of campylobacter jejuni major outer membrane protein porin expression in escherichia coli monitored by using green fluorescent protein.	porins allow exchanges between bacteria and their environment. in the gram-negative food-borne pathogen campylobacter jejuni two porins, major outer membrane protein (momp) and omp50, have been identified. momp is synthesized at a very high level under laboratory culture conditions, suggesting that its promoter functions very efficiently under these conditions. in campylobacter samples, we observed that momp porin expression increased at a high temperature (42 degrees c) or a high ph (ph 8.5) co ...	2002	12200267
quorum sensing and production of autoinducer-2 in campylobacter spp., escherichia coli o157:h7, and salmonella enterica serovar typhimurium in foods.	autoinducer molecules are utilized by gram-negative and gram-positive bacteria to regulate density-dependent gene expression by a mechanism known as quorum sensing. pcr and dna sequencing results showed that campylobacter jejuni and campylobacter coli possessed luxs, which is responsible for autoinducer-2 (ai-2) production. using a vibrio harveyi luminescence assay, the production of ai-2 was observed in milk, chicken broth, and brucella broth by c. coli, c. jejuni, salmonella enterica serovar t ...	2002	12200329
rational design of dna sequence-based strategies for subtyping listeria monocytogenes.	the ability to differentiate bacteria beyond the species level is essential for identifying and tracking infectious disease outbreaks and to improve our knowledge of the population genetics, epidemiology, and ecology of bacterial pathogens. commonly used subtyping methods, such as serotyping, phage typing, ribotyping, and pulsed-field gel electrophoresis, can yield ambiguous results that are difficult to standardize and share among laboratories. dna sequence-based subtyping strategies can reduce ...	2002	12202573
novel domains and orthologues of eukaryotic transcription elongation factors.	the passage of rna polymerase ii across eukaryotic genes is impeded by the nucleosome, an octamer of histones h2a, h2b, h3 and h4 dimers. more than a dozen factors in the yeast saccharomyces cerevisiae are known to facilitate transcription elongation through chromatin. in order to better understand the evolution and function of these factors, their sequences have been compared with known protein, est and dna sequences. elongator subcomplex components elp4p and elp6p are shown to be homologues of ...	2002	12202748
predicted structure and phyletic distribution of the rna-binding protein hfq.	hfq, a bacterial rna-binding protein, was recently shown to contain the sm1 motif, a characteristic of sm and lsm proteins that function in rna processing events in archaea and eukaryotes. in this report, comparative structural modeling was used to predict a three-dimensional structure of the hfq core sequence. the predicted structure aligns with most major features of the methanobacterium thermoautotrophicum lsm protein structure. conserved residues in hfq are positioned at the same structural ...	2002	12202750
immunoglobulin g antibody response to infection with coccoid forms of helicobacter pylori.	an increasing number of studies support a potential role for coccoid forms in helicobacter pylori infection. evidence for this was obtained through scanning microscopy, genetic analysis for virulence traits, examination of the presence and activity of key enzymes, and other methods. we studied the serum immunoglobulin g responses to coccoid h. pylori forms by enzyme-linked immunosorbent assay (elisa) and immunoblotting and compared them with those of bacillary cells. sera from a total of 295 inf ...	2002	12204961
activation of the transcription factor nf-kappab by campylobacter jejuni.	campylobacter jejuni is a food-borne pathogen responsible for infectious enterocolitis. the early-response transcription factor nf-kappa b triggers the expression of genes associated with cellular immune and inflammatory responses. co-incubation of hela cells with viable c. jejuni leads to the activation of the transcription factor nf-kappa b as determined by specific induction of a cellular luciferase-based reporter. boiled cell-free extracts of c. jejuni are also potent dose-dependent stimulat ...	2002	12213922
[utility of studying feces for the diagnosis and management of infants and preschool children with acute diarrhea].	to analyze the results of a stool work-up protocol in a series of infants and preschoolers with acute diarrhea.	2002	12216520
interdependent expression of the cconoqp-rdxbhis loci in rhodobacter sphaeroides 2.4.1.	the rdxbhis gene cluster of rhodobacter sphaeroides 2.4.1, located downstream of the cconoqp operon encoding the cbb(3) cytochrome c oxidase, is required for the posttranscriptional modification of the cbb(3) cytochrome c oxidase. the cbb(3) cytochrome c oxidase is the main terminal oxidase under microaerobic conditions, as well as a component of the signal transduction pathway controlling photosynthesis gene expression. because of the intimate functional and positional relationships of the ccon ...	2002	12218019
[an outbreak of campylobacter jejuni enteritis after farm visit in haifa subdistrict].	we report on an outbreak of campylobacter jejuni (c. jejuni) gastroenteritis among children residing in haifa subdistrict after a farm visit. this incident emphasizes the importance of this issue and our report suggests preventive measures to reduce the risk of transmission of enteric pathogens in such situations.	2002	12222128
detection of escherichia coli o157:h7 using immunomagnetic separation and absorbance measurement.	an assay system for detection of escherichia coli o157:h7 was developed based on immunomagnetic separation of the target pathogen from samples and absorbance measurement of p-nitrophenol at 400 nm from p-nitrophenyl phosphate hydrolysis by alkaline phosphatase (ec 3.1.3.1) on the "sandwich" structure complexes (antibodies coated onto micromagnetic beads--e. coli o157:h7-antibodies conjugated with the enzyme) formed on the microbead surface. the effects of immunoreaction time, phosphate buffer co ...	2002	12223297
dynamic diversity of the tryptophan pathway in chlamydiae: reductive evolution and a novel operon for tryptophan recapture.	complete genomic sequences of closely related organisms, such as the chlamydiae, afford the opportunity to assess significant strain differences against a background of many shared characteristics. the chlamydiae are ubiquitous intracellular parasites that are important pathogens of humans and other organisms. tryptophan limitation caused by production of interferon-gamma by the host and subsequent induction of indoleamine dioxygenase is a key aspect of the host-parasite interaction. it appears ...	2002	12225590
cxxs: fold-independent redox motif revealed by genome-wide searches for thiol/disulfide oxidoreductase function.	redox reactions involving thiol groups in proteins are major participants in cellular redox regulation and antioxidant defense. although mechanistically similar, thiol-dependent redox processes are catalyzed by structurally distinct families of enzymes, which are difficult to identify by available protein function prediction programs. herein, we identified a functional motif, cxxs (cysteine separated from serine by two other residues), that was often conserved in redox enzymes, but rarely in oth ...	2002	12237451
acute cholecystitis.		2002	12242178
identification of a new source of campylobacter contamination in poultry: transmission from breeder hens to broiler chickens.	campylobacter jejuni, a foodborne pathogen closely associated with market poultry, is considered to be the most frequent agent of human gastroenteritis in the united states. the pathways involved in the contamination of poultry flocks, vertical transmission and/or horizontal transmission, are unclear. in this study, campylobacter isolates from two independent commercial broiler breeder flocks, as well as from their respective progeny, were characterized and compared by psti ribotype analysis and ...	2002	12243515
effect of high-temperature inside-outside spray on survival of campylobacter jejuni attached to prechill chicken carcasses.	prechill chicken carcasses, inoculated with campylobacter jejuni, were sprayed in an inside-outside birdwasher at 20, 55, or 60 c, with or without 50 ppm chlorine, in a poultry processing pilot plant. carcasses were sprayed for 12 s at 80 pounds per square inch (psi). next, carcasses were placed in a chiller filled with 50 ppm chlorinated ice water at 4 c for 50 min. most probable numbers of c. jejuni were determined based on chicken carcass wash water before and after the spray treatment. the s ...	2002	12269619
correlations between shine-dalgarno sequences and gene features such as predicted expression levels and operon structures.	this work assesses relationships for 30 complete prokaryotic genomes between the presence of the shine-dalgarno (sd) sequence and other gene features, including expression levels, type of start codon, and distance between successive genes. a significant positive correlation of the presence of an sd sequence and the predicted expression level of a gene based on codon usage biases was ascertained, such that predicted highly expressed genes are more likely to possess a strong sd sequence than avera ...	2002	12270832
multiresistant clones of salmonella enterica: the importance of dissemination.	increasing anitmicrobial resistance among foodborne pathogens has prompted calls for the reduction of anitmicrobial use in livestock to prevent future emergence or resistance. in the case of salmonella enterica, clonal dissemination may play a more critical role in regional changes in antimicrobial resistance in salmonellae than antimicrobial selection pressure. multi-resistant salmonella typhimurium definitive type 104 (mr-dt104) emerged from an unknown location and was disseminated globally du ...	2002	12271270
a study of medico social profile of under five children suffering from diarrhoeal diseases.	in india, 76 of 290 children (26.2%) under five admitted to the pediatric wards of command hospital pune during april-october 1986 suffered from various diarrheal diseases. boys were more likely to be afflicted with a diarrheal disease than girls (63.16% vs. 36.84%). health workers made home visits after hospital discharge. diarrheal illness was more frequent among the lower socioeconomic classes than the upper classes (65.81% for social class iii and 22.37% for social class iv vs. 3.94-7.88 for ...	1991	12288790
evaluation of an immunochromatography strip assay for the detection of salmonella sp. from poultry.	the present study was conducted to evaluate the sensitivity and specificity of an immunochromatography-based diagnostic kit for salmonella. the analytical sensitivity of the test when using pure colonies of different salmonella species was in the range of 1 x 10(4) to 1 x 10(5) colony-forming units per milliliter. the strip detected 19 of 22 strains of salmonella spp. but failed to detect s. worthington, s. choleraesuis var. kunzendorf and s. johannesburg. the strip did not detect 27 different e ...	2002	12296399
long-term antibody responses following human infection with campylobacter jejuni.	epidemiological evidence suggests prior infection of humans by campylobacter jejuni leads to protection against disease following further exposure. it is known that infections elicit strong antibody responses following the onset of disease and that antibody levels are elevated in putatively immune populations. to determine if systemic and mucosal antibodies induced by a confirmed infection remain at elevated levels for prolonged periods, repeat serum, saliva and urine samples were taken from cam ...	2002	12296859
aetiological forms.	at least 25 etiologic agents have been implicated in acute diarrhea. in children, the most common are the rotaviruses, enterotoxigenic escherichia coli, campylobacter jejuni, salmonallae, and shigellae. for example, an attempt was made to isolate enteropathogenic micro-organisms in children under 2 years of age hospitalized in ethiopia with severe or moderate dehydration. a causal agent was identified in 70% of the 175 cases analyzed. 49% of these cases involved rotavirus infections, 19% inc ...	1985	12314104
the exopolyphosphatase gene from sulfolobus solfataricus: characterization of the first gene found to be involved in polyphosphate metabolism in archaea.	inorganic polyphosphate (polyp) polymers are widely distributed in all kinds of organisms. although the presence of polyp in members of the domain archaea has been described, at present nothing is known about the enzymology of polyp metabolism or the genes involved in this domain. we have cloned, sequenced, and overexpressed an exopolyphosphatase (ppx) gene (ppx) from thermophilic sulfolobus solfataricus. the gene codes for a functional ppx and possesses an open reading frame for 417 amino acids ...	2002	12324325
bacterial hemoglobins and flavohemoglobins for alleviation of nitrosative stress in escherichia coli.	escherichia coli mg1655 cells expressing novel bacterial hemoglobin and flavohemoglobin genes from a medium-copy-number plasmid were grown in shake flask cultures under nitrosative and oxidative stress. e. coli cells expressing these proteins display enhanced resistance against the no(.) releaser sodium nitroprusside (snp) relative to that of the control strain bearing the parental plasmid. expression of bacterial hemoglobins originating from campylobacter jejuni (chb) and vitreoscilla sp. (vhb) ...	2002	12324328
double-staining method for differentiation of morphological changes and membrane integrity of campylobacter coli cells.	we developed a double-staining procedure involving nanoorange dye (molecular probes, eugene, oreg.) and membrane integrity stains (live/dead baclight kit; molecular probes) to show the morphological and membrane integrity changes of campylobacter coli cells during growth. the conversion from a spiral to a coccoid morphology via intermediary forms and the membrane integrity changes of the c. coli cells can be detected with the double-staining procedure. our data indicate that young or actively gr ...	2002	12324366
breast feeding may protect children against campylobacter jejuni associated diarrhoea.	to investigate the bacterial etiology of infant diarrhea in karachi, pakistan, 180 rectal swab samples collected from diarrhea patients under 5 years of age and 30 samples from age- and sex-matched healthy children were analyzed. enteropathogenic organisms were isolated from 70 case samples (38.9%). the two most common etiologic agents were campylobacter jejuni (19.4%) and aeromonas hydrophilia (6.1%). salmonella, shigella, and yersina appear to have a limited incidence in this age group. no ...	1996	12346517
the tetracycline resistance protein tet(o) perturbs the conformation of the ribosomal decoding centre.	tet(o) is an elongation factor-like protein found in clinical isolates of campylobacter jejuni that confers resistance to the protein-synthesis inhibitor tetracycline. tet(o) interacts with the 70s ribosome and promotes the release of bound tetracycline, however, as shown here, it does not form the same functional interaction with the 30s subunit. chemical probing demonstrates that tet(o) changes the reactivity of the 16s rrna to dimethyl sulphate (dms). these changes cluster within the decoding ...	2002	12354218
detection in escherichia coli of the genes encoding the major virulence factors, the genes defining the o157:h7 serotype, and components of the type 2 shiga toxin family by multiplex pcr.	strains of shiga toxin-producing escherichia coli (stec) have been associated with outbreaks of diarrhea, hemorrhagic colitis, and hemolytic-uremic syndrome in humans. most clinical signs of disease arise as a consequence of the production of shiga toxin 1 (stx1), stx2 or combinations of these toxins. other major virulence factors include enterohemorrhagic e. coli hemolysin (ehec hlya), and intimin, the product of the eaea gene that is involved in the attaching and effacing adherence phenotype. ...	2002	12354854
right atrial mobile thrombus and pulmonary thromboembolism complicating hemorrhagic campylobacter jejuni colitis.		2002	12356127
ciprofloxacin resistance in campylobacter jejuni: case-case analysis as a tool for elucidating risks at home and abroad.	to determine factors independently associated with the acquisition of a ciprofloxacin-resistant campylobacter jejuni infection.	2002	12356802
evaluation of a commercial diagnostic pcr for the identification of campylobacter jejuni and campylobacter coli.	aims: dupont qualicon recently developed a new pcr assay for the identification of campylobacter jejuni and campylobacter coli. we evaluated the selectivity and utility of this assay compared with a pcr method already in use in our laboratory. methods and results: a group of 133 campylobacter isolates from poultry carcass rinse samples were screened using the commercial pcr and standard pcr. identical results were found for 89.5% (119/133) of the isolates. however, 10.5% (14/133) gave conflictin ...	2002	12358702
genetic diversity and relationships of campylobacter species and subspecies.	the existence of tremendous genetic diversity within campylobacter species has been well documented. to analyse the population structure of campylobacter and determine whether or not a clonal population structure could be detected, genetic diversity was assessed within the genus campylobacter by multilocus enzyme electrophoresis of 156 isolates representing 11 species and subspecies from disparate sources. analyses of electrophoretic mobility of 11 enzymes revealed 109 electrophoretic types (ets ...	2002	12361288
interactions among strategies associated with bacterial infection: pathogenicity, epidemicity, and antibiotic resistance.	infections have been the major cause of disease throughout the history of human populations. with the introduction of antibiotics, it was thought that this problem should disappear. however, bacteria have been able to evolve to become antibiotic resistant. nowadays, a proficient pathogen must be virulent, epidemic, and resistant to antibiotics. analysis of the interplay among these features of bacterial populations is needed to predict the future of infectious diseases. in this regard, we have r ...	2002	12364374
congruent evolution of different classes of non-coding dna in prokaryotic genomes.	prokaryotic genomes are considered to be 'wall-to-wall' genomes, which consist largely of genes for proteins and structural rnas, with only a small fraction of the genomic dna allotted to intergenic regions, which are thought to typically contain regulatory signals. the majority of bacterial and archaeal genomes contain 6-14% non-coding dna. significant positive correlations were detected between the fraction of non-coding dna and inter- and intra-operonic distances, suggesting that different cl ...	2002	12364605
[antiganglioside autoantibody profiles in guillain-barré syndrome].	we established anti-ganglioside antibody profiles in gbs and studied the frequency, fine specificity and clinical correlate. igg and igm antibodies to 8 gangliosides were tested by immunodot-blot in 249 consecutive patients with guillain-barré syndrome with large variability in clinical expression, referred to our laboratory over a 8-year period. igg and igm anti-gm1 antibodies were measured by elisa. thin-layer chromatography overlayed by serum was used to control positivity. 89/249 gbs (36%) h ...	2002	12368145
conservation of the biotin regulon and the bira regulatory signal in eubacteria and archaea.	biotin is a necessary cofactor of numerous biotin-dependent carboxylases in a variety of microorganisms. the strict control of biotin biosynthesis in escherichia coli is mediated by the bifunctional bira protein, which acts both as a biotin-protein ligase and as a transcriptional repressor of the biotin operon. little is known about regulation of biotin biosynthesis in other bacteria. using comparative genomics and phylogenetic analysis, we describe the biotin biosynthetic pathway and the bira r ...	2002	12368242
causative pathogens of severe diarrhea in children.	to investigate the enteropathogens in children with diarrhea attending salmaniya medical complex, bahrain.	2002	12370713
asymmetric directional mutation pressures in bacteria.	when there are no strand-specific biases in mutation and selection rates (that is, in the substitution rates) between the two strands of dna, the average nucleotide composition is theoretically expected to be a = t and g = c within each strand. deviations from these equalities are therefore evidence for an asymmetry in selection and/or mutation between the two strands. by focusing on weakly selected regions that could be oriented with respect to replication in 43 out of 51 completely sequenced b ...	2002	12372146
trypanosomal dutpases as potential targets for drug design.	parasites of the trypanosomatidae family are responsible for diseases that afflict several million people worldwide. currently there is an urgent need for new drugs against these diseases and an approach to drug discovery is the study of biochemical and structural properties of a potential target and the subsequent design of specific compounds. trypanosomatid genes coding for enzymes which distinctively hydrolyze dutp have been isolated by genetic complementation in escherichia coli mutants defe ...	2001	12374098
a green nonsulfur bacterium, dehalococcoides ethenogenes, with the lexa binding sequence found in gram-positive organisms.	dehalococcoides ethenogenes is a member of the physiologically diverse division of green nonsulfur bacteria. using a tblastn search, the d. ethenogenes lexa gene has been identified, cloned, and expressed and its protein has been purified. mobility shift assays revealed that the d. ethenogenes lexa protein specifically binds to both its own promoter and that of the uvra gene, but not to the reca promoter. our results demonstrate that the d. ethenogenes lexa binding site is gaacn(4)gttc, which is ...	2002	12374844
infectious background of patients with a history of acute anterior uveitis.	to study the infectious background of patients with a history of acute anterior uveitis (aau) and healthy control subjects.	2002	12379526
dna sequence and mutational analyses of the pvir plasmid of campylobacter jejuni 81-176.	the circular pvir plasmid of campylobacter jejuni strain 81-176 was determined to be 37,468 nucleotides in length with a g+c content of 26%. a total of 83% of the plasmid represented coding information, and all but 2 of the 54 predicted open reading frames were encoded on the same dna strand. there were seven genes on the plasmid in a continguous region of 8.9 kb that encoded orthologs of type iv secretion proteins found in helicobacter pylori, including four that have been described previously ...	2002	12379703
bactericidal activities of plant essential oils and some of their isolated constituents against campylobacter jejuni, escherichia coli, listeria monocytogenes, and salmonella enterica.	an improved method of sample preparation was used in a microplate assay to evaluate the bactericidal activity levels of 96 essential oils and 23 oil compounds against campylobacter jejuni, escherichia coli o157:h7, listeria monocytogenes, and salmonella enterica obtained from food and clinical sources. bactericidal activity (ba50) was defined as the percentage of the sample in the assay mixture that resulted in a 50% decrease in cfu relative to a buffer control. twenty-seven oils and 12 compound ...	2002	12380738
microbiological investigations of rainwater and graywater collected for toilet flushing.	seven danish rainwater systems were investigated with respect to the microbial water quality. the general microbiological quality (total numbers of bacteria (aodc)), and heterotrophic plate counts on r2a and plate count agar in the toilets supplied with rainwater were approximately the same as in the reference toilets supplied with drinking water. however, in 12 of the 27 analysed samples one or more pathogens were observed (aeromonas sp., pseudomonas aeruginosa, legionella non-pneumophila, camp ...	2002	12381006
speciation of thermotolerant campylobacter isolates involved in foodborne disease by means of dna restriction analysis and molecular probes.	the molecular identification of several strains of campylobacter jejuni and campylobacter coli involved in foodborne disease was carried out by investigating the restriction profiles of their chromosomal dna and by dna/dna hybridization. cleavage with ecorv allowed the visualization of a 3 kb dna fragment characteristic of c. jejuni, whereas restriction with clai allowed the identification of a 9.3 kb dna fragment, also characteristic of c. jejuni, and a dna duplet of 9.5-10 kb, specific to c. c ...	2002	12381150
enteropathogens associated with acute diarrhea in community and hospital patients in jakarta, indonesia.	the prevalence of bacteria, parasite and viral pathogens in 3875 patients with diarrhea in community and hospital settings from march 1997 through august 1999 in jakarta, indonesia was determined using routine bacteriology and molecular assay techniques. bacterial pathogens isolated from hospital patients were, in decreasing frequency, vibrio cholerae o1, shigella flexneri, salmonella spp. and campylobacter jejuni, while s. flexneri, v. cholerae o1, salmonella spp. and c. jejuni were isolated fr ...	2002	12381465
thermotolerant campylobacters in domestic animals in a defined population in buenos aires, argentina.	we assessed the prevalence of campylobacter jejuni in animals in a region of unsatisfied basic needs in the city of buenos aires and studied a few risk factors. first we conducted a census to identify all dwellings having pet animals (dogs, cats, and birds). fecal samples were then taken for isolation and identification of strains. we observed 17% prevalence for dogs (95% ci: 13, 22), 16% for cats (95% ci: 8, 27) and 19% for birds (95% ci: 5, 42). in dogs, the highest prevalences were found in s ...	2002	12383655
gyra and gyrb mutations are implicated in cross-resistance to ciprofloxacin and moxifloxacin in clostridium difficile.	a total of 198 nonrepetitive clinical strains of clostridium difficile isolated from different french hospitals in 1991 (n = 100) and 1997 (n = 98) were screened for decreased susceptibility to fluoroquinolones by plating onto wilkins-chalgren agar containing 16 micro g of ciprofloxacin per ml. the frequency of decreased susceptibility was 7% (14 of 198) and was identical for the years 1991 and 1997. serogroups c, h, d, a9, and k accounted for five, four, two, one, and one of the resistant strai ...	2002	12384345
class 1 integron-associated tobramycin-gentamicin resistance in campylobacter jejuni isolated from the broiler chicken house environment.	using pcr, we screened 105 isolates of poultry-associated campylobacter jejuni for the presence of class 1 integrons. of those isolates, 21% (22 of 105) possessed the integrase gene, but only 5 isolates produced an amplicon in a 5'-3' conserved sequence pcr directed toward amplification of the resistance cassettes. dna sequencing demonstrated that all five isolates possessed the aminoglycoside resistance gene, aaca4.	2002	12384387
an unusual case of campylobacter jejuni pericarditis in a patient with x-linked agammaglobulinemia.		2002	12392379
the structures of the lipooligosaccharide and capsule polysaccharide of campylobacter jejuni genome sequenced strain nctc 11168.	campylobacter jejuni infections are one of the leading causes of human gastroenteritis and are suspected of being a precursor to guillain-barré and miller-fisher syndromes. recently, the complete genome sequence of c. jejuni nctc 11168 was described. in this study, the molecular structure of the lipooligosaccharide and capsular polysaccharide of c. jejuni nctc 11168 was investigated. the lipooligosaccharide was shown to exhibit carbohydrate structures analogous to the gm1a and gm2 carbohydrate e ...	2002	12392544
risk factors for campylobacter infection in norwegian cats and dogs.	rectal swabs from healthy cats and dogs, and from dogs and cats with clinical diarrhoea were collected approximately every third month from may 2000 to june 2001 from six small-animal practices throughout norway. a questionnaire was filled in for each animal. of the 301 healthy cats sampled, 54 (18%) were positive for campylobacter, compared to 5 out of 31 (16%) cats with diarrhoea. campylobacter jejuni was isolated from 11 (3%), c. upsaliensis from 42 (13%) and c. coli from 2 (0.6%) of the cats ...	2002	12392875
occupational health and safety in small animal veterinary practice: part ii--parasitic zoonotic diseases.		2002	12395769
structural heterogeneity of carbohydrate modifications affects serospecificity of campylobacter flagellins.	flagellin from campylobacter coli vc167 is post-translationally modified at > or = 16 amino acid residues with pseudaminic acid and three related derivatives. the predominant modification was 5,7-diacetamido-3,5,7,9 - tetradeoxy - l - glycero - l - manno - nonulosonic acid (pseudaminic acid, pse5ac7ac), a modification that has been described previously on flagellin from campylobacter jejuni 81-176. vc167 lacked two modi-fications present in 81-176 and instead had two unique modifications of mass ...	2002	12406231
the murein hydrolase of the bacteriophage phi3626 dual lysis system is active against all tested clostridium perfringens strains.	clostridium perfringens commonly occurs in food and feed, can produce an enterotoxin frequently implicated in food-borne disease, and has a substantial negative impact on the poultry industry. as a step towards new approaches for control of this organism, we investigated the cell wall lysis system of c. perfringens bacteriophage phi3626, whose dual lysis gene cassette consists of a holin gene and an endolysin gene. hol3626 has two membrane-spanning domains (msds) and is a group ii holin. a posit ...	2002	12406719
detection of cytotoxin-hemolysin mrna in nonculturable populations of environmental and clinical vibrio vulnificus strains in artificial seawater.	the objective of this study was to develop a molecular detection method that better estimates the potential risk associated with the presence of vibrio vulnificus. for that purpose, we applied seminested reverse transcription-pcr (rt-pcr) to viable but nonculturable (vbnc) populations of v. vulnificus and targeted the cytotoxin-hemolysin virulence gene vvha. three strains, two environmental, if vv10 and if vv18, and one clinical, c7184, were used in this study. artificial seawater, inoculated wi ...	2002	12406760
acute isolated bulbar palsy with anti-gt1a igg antibody subsequent to campylobacter jejuni enteritis.	we describe a patient with acute isolated bulbar palsy following enteritis. a 29-year-old man developed dysphagia and nasal voice without limb weakness, ataxia, or areflexia. high titres of serum anti-gt1a and anti-campylobacter jejuni igg antibodies were detected. he was treated with plasmapheresis, resulting in rapid clinical improvement. this case suggests that an acute isolated bulbar palsy may be caused by a pathology relating to guillain-barré syndrome (gbs), in which anti-gt1a igg antibod ...	2002	12409189
detection of gyra mutations in quinolone-resistant salmonella enterica by denaturing high-performance liquid chromatography.	denaturing high-performance liquid chromatography (dhplc) was evaluated as a rapid screening and identification method for dna sequence variation detection in the quinolone resistance-determining region of gyra from salmonella serovars. a total of 203 isolates of salmonella were screened using this method. dhplc analysis of 14 isolates representing each type of novel or multiple mutations and the wild type were compared with lightcycler-based pcr-gyra hybridization mutation assay (gama) and sing ...	2002	12409384
rate of occurrence and pathogenic effect of enteroaggregative escherichia coli virulence factors in international travelers.	one or more putative enteroaggregative escherichia coli (eaec) virulence factors (agga, aggr, aspu, or aafa) were identified in 60 (70%) of 86 eaec isolates from travelers with diarrhea compared with a rate of 7 (8%) of 90 in patients with diarrhea who were infected with nonadherent e. coli (odds ratio, 27.36; 95% confidence interval, 11.30 to 65.91). the presence of aggr or one or more virulence factors in eaec from patients with diarrhea was associated with a statistically increased concentrat ...	2002	12409395
wound botulism associated with subcutaneous drug use.		2002	12411365
the phage n4 virion rna polymerase catalytic domain is related to single-subunit rna polymerases.	in vitro, bacteriophage n4 virion rna polymerase (vrnap) recognizes in vivo sites of transcription initiation on single-stranded templates. n4 vrnap promoters are comprised of a hairpin structure and conserved sequences. here, we show that vrnap consists of a single 3500 amino acid polypeptide, and we define and characterize a transcriptionally active 1106 amino acid domain (mini-vrnap). biochemical and genetic characterization of this domain indicates that, despite its peculiar promoter specifi ...	2002	12411499
fulminant guillain-barrè syndrome after campylobacter jejuni enteritis and anti-ganglioside antibody.		2002	12412991
fulminant guillain-barré syndrome after campylobacter jejuni enteritis and monospecific anti-gt1a igg antibody.	a 21-year-old man developed rapid progression of tetraplegia, bulbar palsy, and respiratory paralysis after campylobacterjejuni enteritis. based on the diagnosis of guillain-barré syndrome, he received plasmapheresis and intravenous immunoglobulin. serum anti-gt1a igg antibody which lacked cross-reactivity with gq1b was detected. four months after the onset, the patient still had severe muscle weakness of the lower limbs. this case suggests that anti-gt1a igg antibody can be associated with seve ...	2002	12413017