Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| survival of helicobacter pylori in a natural freshwater environment. | the mode by which helicobacter pylori, the causative agent of most gastric ulcers, is transmitted remains undetermined. epidemiological evidence suggests these organisms are waterborne; however, h. pylori has rarely been grown from potential water sources. this may be due to the ability of this organism to rapidly enter the viable but nonculturable (vbnc) state. our investigation examines the entrance of h. pylori into this state in laboratory cultures and a natural freshwater environment as wel ... | 2003 | 14660399 |
| genetic diversity of campylobacter jejuni isolates from farm animals and the farm environment. | the genetic diversity of campylobacter jejuni isolates from farm animals and their environment was investigated by multilocus sequence typing (mlst). a total of 30 genotypes, defined by allelic profiles (assigned to sequence types [sts]), were found in 112 c. jejuni isolates originating in poultry, cattle, sheep, starlings, and slurry. all but two of these genotypes belonged to one of nine c. jejuni clonal complexes previously identified in isolates from human disease and retail food samples and ... | 2003 | 14660392 |
| risk factors for sporadic campylobacter jejuni infections in rural michigan: a prospective case-control study. | this case-control study investigated risk factors for campylobacteriosis in a rural population. exposure to live farm animals was hypothesized to increase the risk for campylobacter jejuni enteritis. | 2003 | 14652344 |
| antimicrobial resistance in campylobacter jejuni and campylobacter coli strains isolated in 1991 and 2001-2002 from poultry and humans in berlin, germany. | the susceptibilities of 430 campylobacter jejuni strains and 79 c. coli strains to six antimicrobial agents were tested and analyzed. the two sets of strains originated from retail market chicken and turkey samples and from humans, respectively, in berlin, germany. two groups of isolates, one dating from 1991 and the other dating from 2001-2002, were tested. of the campylobacter sp. isolates recovered from humans in 2001-2002, 45.1% were resistant to ciprofloxacin, 37.8% were resistant to tetrac ... | 2003 | 14638490 |
| isolation of campylobacter jejuni and campylobacter coli from the gall bladder samples of sheep and identification by polymerase chain reaction. | in this study, 100 gall bladder samples of sheep slaughtered at an abattoir in elaziğ province were examined for campylobacter jejuni and campylobacter coli by culture and polymerase chain reaction (pcr). preston campylobacter agar supplemented with 7% horse blood and preston selective supplement (oxoid, hampshire, uk) were used for isolation of the agents. campylobacter spp. were isolated in 66 samples, and they were identified as 34% c. jejuni and 32% c. coli. a multiplex pcr based upon the us ... | 2003 | 14629001 |
| effect of temperature on viability of campylobacter jejuni and campylobacter coli on raw chicken or pork skin. | to determine growth and survival of campylobacter jejuni and campylobacter coli on chicken and pork, campylobacter spp. (10(4) cfu/cm2) were inoculated on pieces of raw, irradiated chicken or pork skin and exposed to temperatures ranging from -20 to 42 degrees c under either microaerobic or aerobic conditions. viable counts over 48 h declined 2 to 3 log cfu/cm2 at -20 degrees c and 1 to 2 log cfu/cm2 at 25 degrees c regardless of skin type, species of campylobacter, or level of oxygen. at 4 degr ... | 2003 | 14627278 |
| pseudaminic acid, the major modification on campylobacter flagellin, is synthesized via the cj1293 gene. | flagellins from campylobacter jejuni 81-176 and campylobacter coli vc167 are heavily glycosylated. the major modifications on both flagellins are pseudaminic acid (pse5ac7ac), a nine carbon sugar that is similar to sialic acid, and an acetamidino-substituted analogue of pseudaminic acid (pseam). previous data have indicated that pseam is synthesized via pse5ac7ac in c. jejuni 81-176, but that the two sugars are synthesized using independent pathways in c. coli vc167. the cj1293 gene of c. jejuni ... | 2003 | 14617187 |
| evaluation of the prospect microplate assay for detection of campylobacter: a routine laboratory perspective. | to evaluate the use of the new enzyme-linked immunosorbent assay, the prospect campylobacter microplate assay (alexon-trend, minneapolis, mn, usa), which allows 2-h detection of both campylobacter jejuni and campylobacter coli antigen directly in stool specimens. | 2003 | 14616724 |
| characterization of waterborne outbreak-associated campylobacter jejuni, walkerton, ontario. | 2003 | 14609457 | |
| hazards of healthy living: bottled water and salad vegetables as risk factors for campylobacter infection. | 2003 | 14609455 | |
| diversity and succession of the intestinal bacterial community of the maturing broiler chicken. | the diversity of bacterial floras in the ilea and ceca of chickens that were fed a vegetarian corn-soy broiler diet devoid of feed additives was examined by analysis of 1,230 partial 16s rrna gene sequences. nearly 70% of sequences from the ileum were related to those of lactobacillus, with the majority of the rest being related to clostridiaceae (11%), streptococcus (6.5%), and enterococcus (6.5%). in contrast, clostridiaceae-related sequences (65%) were the most abundant group detected in the ... | 2003 | 14602645 |
| web-based phylogenetic assignment tool for analysis of terminal restriction fragment length polymorphism profiles of microbial communities. | culture-independent dna fingerprints are commonly used to assess the diversity of a microbial community. however, relating species composition to community profiles produced by community fingerprint methods is not straightforward. terminal restriction fragment length polymorphism (t-rflp) is a community fingerprint method in which phylogenetic assignments may be inferred from the terminal restriction fragment (t-rf) sizes through the use of web-based resources that predict t-rf sizes for known b ... | 2003 | 14602639 |
| molecular structure and evolution of the conjugative multiresistance plasmid pre25 of enterococcus faecalis isolated from a raw-fermented sausage. | plasmid pre25 from enterococcus faecalis transfers resistances against kanamycin, neomycin, streptomycin, clindamycin, lincomycin, azithromycin, clarithromycin, erythromycin, roxithromycin, tylosin, chloramphenicol, and nourseothricin sulfate by conjugation in vitro to e. faecalis jh2-2, lactococcus lactis bu2, and listeria innocua l19. its nucleotide sequence of 50237 base pairs represents the largest, fully sequenced conjugative multiresistance plasmid of enterococci (plasmid 46 (2001) 170). t ... | 2003 | 14597005 |
| flagellin glycosylation island in pseudomonas syringae pv. glycinea and its role in host specificity. | the deduced amino acid sequences of the flagellins of pseudomonas syringae pv. tabaci and p. syringae pv. glycinea are identical; however, their abilities to induce a hypersensitive reaction are clearly different. the reason for the difference seems to depend on the posttranslational modification of the flagellins. to investigate the role of this posttranslational modification in the interactions between plants and bacterial pathogens, we isolated genes that are potentially involved in the postt ... | 2003 | 14594840 |
| prevalence of campylobacter spp isolated from the intestinal tract of pigs raised in an integrated swine production system. | to enumerate the prevalence of campylobacter isolates in the intestinal tract of market-weight swine raised in an integrated swine operation in texas. | 1999 | 14567422 |
| deletion of helicobacter pylori vacuolating cytotoxin gene by introduction of directed mutagenesis. | to construct a vaca-knockout helicobacter pylori mutant strain, whose only difference from the wild strain is its disrupted vaca gene. | 2003 | 14562387 |
| antimicrobial resistance in campylobacter from broilers: association with production type and antimicrobial use. | the isolation and antimicrobial resistance of campylobacter jejuni and campylobacter coli strains from broilers arriving in french slaughterhouses, were analysed according to production types (i.e. standard, export or free-range) and antimicrobial (i.e. coccidiostats, growth promoters or therapeutic agents) administration in flocks. prevalence was 56.6% in standard, 51.3% in export and 80.0% in free-range broilers. three hundred and ninety-three strains were identified. two-thirds of the strains ... | 2003 | 14559174 |
| comparison of campylobacter isolates from poultry and humans: association between in vitro virulence properties, biotypes, and pulsed-field gel electrophoresis clusters. | the in vitro virulence properties of 197 temporally and geographically related campylobacter isolates from chicken broilers and humans were compared. comparisons of the virulence properties associated with genotypes and biotypes were made. all isolates adhered to, and 63% invaded, int-407 cells, whereas 13% were cytotoxic for cho cells. cho cell-cytotoxic extracts were also cytotoxic for int-407 cells, but the sensitivity for vero cells was variable. the proportion of isolates demonstrating a hi ... | 2003 | 14532099 |
| application of host-specific bacteriophages to the surface of chicken skin leads to a reduction in recovery of campylobacter jejuni. | retail poultry products are widely purported as the major infection vehicle for human campylobacteriosis. numerous intervention strategies have sought to reduce campylobacter contamination on broiler carcasses in the abattoir. this study reports the efficacy of bacteriophage in reducing the number of recoverable campylobacter jejuni cells on artificially contaminated chicken skin. | 2003 | 14532096 |
| comparison of the bax system with a multiplex pcr method for simultaneous detection and identification of campylobacter jejuni and campylobacter coli in environmental samples. | the campylobacter detection is performed by conventional culture methods and the identification of campylobacter jejuni and campylobacter coli is principally based on the hippurate hydrolysis test. the two major drawbacks of this biochemical test for species identification include the inconsistency of the results and the presence of atypical strains, which can lead to the misidentification of an isolate. as an alternative, multiplex polymerase chain reaction (mpcr) protocols for the simultaneous ... | 2003 | 14527799 |
| the iron-responsive regulator fur is transcriptionally autoregulated and not essential in neisseria meningitidis. | fur is a well-known iron-responsive repressor of gene transcription, which is used by many bacteria to respond to the low-iron environment that pathogens encounter during infection. the fur gene in neisseria meningitidis has been described as an essential gene that may regulate a broad array of genes. we succeeded in obtaining an n. meningitidis mutant with the fur gene knocked out and used it to undertake studies of fur-mediated iron regulation. we show that expression of both fur and the trans ... | 2003 | 14526014 |
| ribotyping characterisation of campylobacter isolates randomly collected from different sources in italy. | in this study the potential for using the automated psti ribotyping as a primary library typing method to survey campylobacter and for identification of two thermophilic campylobacter jejuni and campylobacter coli species was evaluated. a total of 158 isolates randomly collected in italy from different sources were analyzed. a large percentage of chicken (28%), turkey (27%) and turkey meat (25%) isolates shared their ribotyping profiles (ribotypes) with those of humans, whereas the swine isolate ... | 2003 | 14522511 |
| simultaneous detection of mutations associated with resistance to macrolides and quinolones in campylobacter jejuni and c. coli using a pcr-line probe assay. | quinolone and macrolide resistance of campylobacter jejuni and campylobacter coli mainly depend on a mutation in gyra and in 23s rdna, respectively. in order to detect quinolone and/or macrolide resistant c. jejuni and c. coli strains, a macrolide and quinolone line probe assay (mq-lipa) was developed and 42 c. jejuni and c. coli strains were tested to evaluate the efficiency of the assay. profiles of the mutations in 23s rdna and in gyra characterized by mq-lipa agreed with resistance to macrol ... | 2003 | 14522100 |
| disinfectant susceptibility testing of avian and swine campylobacter isolates by a filtration method. | the susceptibility testing of disinfectants against campylobacter jejuni and campylobacter coli strains from broilers and pigs was investigated. the filtration method european standard en 1040 was adapted to campylobacter cultures and validated with reference strains. two disinfectants were tested: 1% benzalkonium chloride active matter, as quaternary ammonium compound, and 0.63% sodium hypochlorite as chlorine-releasing agent. both disinfectants were effective against the 34 campylobacter strai ... | 2003 | 14516706 |
| detection and enumeration of campylobacter jejuni and campylobacter coli by indirect impedimetry with an oxygen scavenging system. | six strains of campylobacter jejuni and campylobacter coli were shown to grow in a variety of media, but, with one exception, they were unable to produce sufficient change in the electrical properties of the medium to allow their detection by impedance monitoring. with the use of an indirect method based on absorption of evolved carbon dioxide and a medium containing the oxygen scavenger oxyrase, all strains were detectable, and correlations between time to detection and the logarithm of the ino ... | 2003 | 14503735 |
| prevalence of campylobacter within a swine slaughter and processing facility. | in this work, the occurrence of campylobacter in a swine slaughter and processing facility was studied. thirty composite carcass samples, representing 360 swine carcasses, were taken immediately after exsanguination, immediately after polishing, after the final wash, and after overnight chilling at 2 degrees c. thirty matching composite rectal samples were also taken immediately after exsanguination, and 60 nonmatching individual colon samples were collected from the same lot of swine during evi ... | 2003 | 14503704 |
| the isolation of vibrio coli from pigs. | 1965 | 14330205 | |
| [analogical characteristics of certain strains of vibrio coli and vibrio foetus; bovine intestinal adapation of v. coli]. | 1957 | 13500741 | |
| production of cytolethal distending toxins by pathogenic escherichia coli strains isolated from human and animal sources: establishment of the existence of a new cdt variant (type iv). | three types of cytolethal distending toxin (cdt), namely, cdt-i, cdt-ii, and cdt-iii, have been described in escherichia coli. using primers designed for the detection of sequences common to the cdtb genes, we analyzed by pcr a set of 21 cdt-producing e. coli strains of intestinal and extraintestinal origins isolated from human and different animal species in several european countries and in the united states. on the basis of the existing differences in the cdtb genes, cdt-i-, cdt-ii-, and cdt- ... | 2003 | 12958258 |
| microarray-based identification of thermophilic campylobacter jejuni, c. coli, c. lari, and c. upsaliensis. | dna microarrays are an excellent potential tool for clinical microbiology, since this technology allows relatively rapid identification and characterization of microbial and viral pathogens. in the present study, an oligonucleotide microarray was developed and used for the analysis of thermophilic campylobacter spp., the primary food-borne pathogen in the united states. we analyzed four campylobacter species: campylobacter jejuni, c. coli, c. lari, and c. upsaliensis. our assay relies on the pcr ... | 2003 | 12958228 |
| toward an international standard for pcr-based detection of food-borne thermotolerant campylobacters: validation in a multicenter collaborative trial. | as part of a european research project, the performance of a pcr assay to detect food-borne thermotolerant campylobacters (campylobacter jejuni, c. coli, and c. lari) was evaluated through an international collaborative trial involving 12 participating laboratories. dna from 10 target and 8 nontarget strains was tested, and the results were reported as the presence of a positive signal after gel electrophoresis. the overall inclusivity (sensitivity) was 93.7%, and the exclusivity (specificity) w ... | 2003 | 12957959 |
| toward an international standard for pcr-based detection of food-borne thermotolerant campylobacters: assay development and analytical validation. | as part of a european research project (food-pcr), we developed a standardized and robust pcr detection assay specific for the three most frequently reported food-borne pathogenic campylobacter species, c. jejuni, c. coli, and c. lari. fifteen published and unpublished pcr primers targeting the 16s rrna gene were tested in all possible pairwise combinations, as well as two published primers targeting the 23s rrna gene. a panel of 150 strains including target and nontarget strains was used in an ... | 2003 | 12957958 |
| natural transformation of campylobacter jejuni requires components of a type ii secretion system. | the human pathogen campylobacter jejuni is one of more than 40 naturally competent bacterial species able to import macromolecular dna from the environment and incorporate it into their genomes. however, in c. jejuni little is known about the genes involved in this process. we used random transposon mutagenesis to identify genes that are required for the transformation of this organism. we isolated mutants with insertions in 11 different genes; most of the mutants are affected in the dna uptake ... | 2003 | 12949093 |
| development of a sensitive dna microarray suitable for rapid detection of campylobacter spp. | campylobacter is the most common cause of human acute bacterial gastroenteritis worldwide, widely distributed and isolated from human clinical samples as well as from many other different sources. to comply with the demands of consumers for food safety, there is a need for development of a rapid, sensitive and specific detection method for campylobacter. in this study, we present the development of a novel sensitive dna-microarray based detection method, evaluated on campylobacter and non-campyl ... | 2003 | 12944122 |
| in vitro activities of new fluoroquinolones against campylobacter jejuni and campylobacter coli isolates obtained from humans in 1980 to 1982 and 1997 to 2001. | the antibacterial activities of three newly developed fluoroquinolones (gatifloxacin, levofloxacin, and moxifloxacin) against a total of 307 gastrointestinal human isolates of campylobacter jejuni and campylobacter coli collected during 1980 to 1982 and 1997 to 2001 were examined and compared to those of ciprofloxacin and the unrelated antibacterial agents, clarithromycin, erythromycin, and tetracycline by using the agar plate dilution method. all of the fluoroquinolones exhibited a good activit ... | 2003 | 12936999 |
| sequence analysis of a cryptic plasmid pcj419 from campylobacter jejuni and construction of an escherichia coli-campylobacter shuttle vector. | a small cryptic plasmid, pcj419, was identified in a human clinical isolate of campylobacter jejuni, cloned and sequenced. pcj419 is a circular molecule of 4013 bp with a g+c content of 27.1%. the products of four open reading frames (orfs) share significant sequence similarity with putative proteins from known c. jejuni and campylobacter coli plasmids. orf-1 encodes a putative mobilisation protein (mob). orf-2 and orf-3 encode proteins that have high identity to putative repa and repb proteins, ... | 2003 | 12932741 |
| comparison of human and porcine strains of campylobacter coli. | 2003 | 12930063 | |
| rapid detection of campylobacter jejuni in chicken rinse water by melting-peak analysis of amplicons in real-time polymerase chain reaction. | five dna extraction protocols for the detection of campylobacter spp. by polymerase chain reaction (pcr) were compared. a method involving triton x-100 produced template dna of sufficient quality to allow the detection of campylobacter jejuni at levels of 100 cfu/ml in pure culture. primers were designed on the basis of the cadf gene sequence. with a sybr green i real-time pcr assay, these primers amplified only sequences present in c. jejuni to produce a product with a melting temperature of 81 ... | 2003 | 12929818 |
| prevalence of multiple antibiotic resistance in 443 campylobacter spp. isolated from humans and animals. | in view of recent findings that a multidrug efflux pump cmeabc exists in campylobacter jejuni, 391 c. jejuni and 52 campylobacter coli of human and animal origin were examined for a multidrug resistance phenotype. | 2003 | 12917241 |
| molecular typing of campylobacter jejuni isolates involved in a neonatal outbreak indicates nosocomial transmission. | genotypic typing by restriction fragment length polymorphism and pulsed-field gel electrophoresis showed that two neonates in a neonatal ward were infected with the same campylobacter jejuni strain. isolates from the mother and brother of the index patient were identical to each other but distinct from the neonatal type. genotyping results therefore suggested that the neonatal c. jejuni infection was nosocomial in origin. | 2003 | 12904420 |
| description of a "phoenix" phenomenon in the growth of campylobacter jejuni at temperatures close to the minimum for growth. | when campylobacter jejuni cultures that had been grown in broth at 39 degrees c were subcultured into fresh medium at 30 degrees c, there was a transient period of growth followed by a decline in viable-cell numbers before growth resumed once more. we propose that this complex behavior is the net effect of the growth of inoculum cells followed by a loss of viability due to oxidative stress and the subsequent emergence of a spontaneously arising mutant population that takes over the culture. | 2003 | 12902294 |
| effect of incubation temperature on isolation of campylobacter jejuni genotypes from foodstuffs enriched in preston broth. | preston broth and agar incubated at either 37 or 42 degrees c have been widely used to isolate campylobacters from foodstuffs. the consequences of using either incubation temperature were investigated. retail packs of raw chicken (n = 24) and raw lamb liver (n = 30) were purchased. samples were incubated in preston broth at 37 and 42 degrees c and then streaked onto preston agar and incubated as before. two campylobacter isolates per treatment were characterized. poultry isolates were genotyped ... | 2003 | 12902254 |
| sources of campylobacter colonization in broiler chickens. | 2003 | 12902214 | |
| [antibody response following campylobacter infections determined by elisa]. | an enzyme-linked immunosorbent assay (elisa) was adapted to measure immunoglobulin g (igg), igm, and iga classes of human serum antibody to campylobacter jejuni and campylobacter coli. a total of 631 sera from 210 patients with verified campylobacter enteritis were examined at various intervals after infection, and a control group of 164 sera were tested to determine the cut-off for negative results. with 90 percentile specificity, igg, igm, and iga showed a sensitivity of 71, 60, and 80%, respe ... | 2003 | 12872469 |
| versatility of aminoglycosides and prospects for their future. | aminoglycoside antibiotics have had a major impact on our ability to treat bacterial infections for the past half century. whereas the interest in these versatile antibiotics continues to be high, their clinical utility has been compromised by widespread instances of resistance. the multitude of mechanisms of resistance is disconcerting but also illuminates how nature can manifest resistance when bacteria are confronted by antibiotics. this article reviews the most recent knowledge about the mec ... | 2003 | 12857776 |
| campylobacter coli - an important foodborne pathogen. | campylobacters are the most common bacterial cause of infectious intestinal disease (iid) in temperate countries. c. jejuni is the predominant cause of campylobacter iid, but the impact of other, less prevalent species has largely been ignored. here, we present estimates of the burden of indigenously acquired foodborne disease (ifd) due to campylobacter coli, the second most common cause of human campylobacteriosis. | 2003 | 12850159 |
| helicobacter pylori preferentially induces interleukin 12 (il-12) rather than il-6 or il-10 in human dendritic cells. | dendritic cells are potent antigen-presenting cells that are present in the gastrointestinal tract and are required for the induction of a th1 t-cell acquired immune response. since infection with the gastric pathogen helicobacter pylori elicits a th1 cell response, the interaction of these organisms with dendritic cells should reflect the th1 bias. we incubated h. pylori with cultured human dendritic cells and measured the cytokine induction profile, comparing the response to that induced by sa ... | 2003 | 12819109 |
| infectious agent and immune response characteristics of chronic enterocolitis in captive rhesus macaques. | chronic enterocolitis is the leading cause of morbidity in colonies of captive rhesus macaques (macaca mulatta). this study's aim was to identify the common enteric pathogens frequently associated with chronic enterocolitis in normal, immunocompetent rhesus monkeys and to elucidate the influence of this clinical syndrome on the host immune system. we analyzed the fecal specimens from 100 rhesus macaques with or without clinical symptoms of chronic diarrhea. retrospective analysis revealed an inc ... | 2003 | 12819098 |
| the complete genome sequence of the carcinogenic bacterium helicobacter hepaticus. | helicobacter hepaticus causes chronic hepatitis and liver cancer in mice. it is the prototype enterohepatic helicobacter species and a close relative of helicobacter pylori, also a recognized carcinogen. here we report the complete genome sequence of h. hepaticus atcc51449. h. hepaticus has a circular chromosome of 1,799,146 base pairs, predicted to encode 1,875 proteins. a total of 938, 953, and 821 proteins have orthologs in h. pylori, campylobacter jejuni, and both pathogens, respectively. h. ... | 2003 | 12810954 |
| comparison of eight phenotypic methods for subspecies characterization of thermophilic campylobacter spp. isolated from pig liver. | four hundred pork livers from bacon pigs (37 herds) obtained at six pig-processing plants were studied to assess the campylobacter contamination rate. deep tissue areas were sampled immediately after evisceration. approximately 6% of livers were infected with campylobacter spp., including campylobacter coli (67%), campylobacter jejuni (30%), and campylobacter lari (3%). the 60 resulting isolates (39 c. coli isolates, 19 c. jejuni isolates, and 2 c. lari isolates) employed in this study were char ... | 2003 | 12801013 |
| reduction of bacteria on pork carcasses associated with chilling method. | in addition to reducing the temperature of pork carcasses immediately after slaughter and before fabrication, blast chilling (snap chill) or conventional chilling can reduce bacterial populations associated with fresh meats. however, there is little information on bacteria survival resulting from the freeze or chill injury of meat products. in this study, porcine fecal slurries with and without pathogens (listeria monocytogenes, salmonella typhimurium, and campylobacter coli) were inoculated ont ... | 2003 | 12801003 |
| species-specific identification of campylobacters by partial 16s rrna gene sequencing. | species-specific identification of campylobacters is problematic, primarily due to the absence of suitable biochemical assays and the existence of atypical strains. 16s rrna gene (16s rdna)-based identification of bacteria offers a possible alternative when phenotypic tests fail. therefore, we evaluated the reliability of 16s rdna sequencing for the species-specific identification of campylobacters. sequence analyses were performed by using almost 94% of the complete 16s rrna genes of 135 phenot ... | 2003 | 12791878 |
| rapid detection of campylobacter coli, c. jejuni, and salmonella enterica on poultry carcasses by using pcr-enzyme-linked immunosorbent assay. | contamination of retail poultry by campylobacter spp. and salmonella enterica is a significant source of human diarrheal disease. isolation and identification of these microorganisms require a series of biochemical and serological tests. in this study, campylobacter ceue and salmonella inva genes were used to design probes in pcr-enzyme-linked immunosorbent assay (elisa), as an alternative to conventional bacteriological methodology, for the rapid detection of campylobacter jejuni, campylobacter ... | 2003 | 12788755 |
| use of pcr for direct detection of campylobacter species in bovine feces. | this study reports on the use of pcr to directly detect and distinguish campylobacter species in bovine feces without enrichment. inhibitors present in feces are a major obstacle to using pcr to detect microorganisms. the qiaamp dna stool minikit was found to be an efficacious extraction method, as determined by the positive amplification of internal control dna added to bovine feces before extraction. with nested or seminested multiplex pcr, campylobacter coli, c. fetus, c. hyointestinalis, and ... | 2003 | 12788747 |
| campylobacter--a tale of two protein glycosylation systems. | post-translational glycosylation is a universal modification of proteins in eukarya, archaea and bacteria. two recent publications describe the first confirmed report of a bacterial n-linked glycosylation pathway in the human gastrointestinal pathogen campylobacter jejuni. in addition, an o-linked glycosylation pathway has been identified and characterized in c. jejuni and the related species campylobacter coli. both pathways have similarity to the respective n- and o-linked glycosylation proces ... | 2003 | 12781527 |
| antimicrobial resistance of campylobacter jejuni subsp. jejuni strains isolated from humans in 1998 to 2001 in montréal, canada. | the rates of resistance of 51 to 72 human strains of campylobacter jejuni subsp. jejuni isolated annually from 1998 to 2001 in montréal, québec, canada, varied from 1 to 12% for erythromycin, 43 to 68% for tetracycline, and 10 to 47% for ciprofloxacin. in the last years of the study, there was a significant increase in the rate of resistance to ciprofloxacin (p = 0.00003) but not in the rate of resistance to erythromycin (p = 0.056) or tetracycline (p = 0.095) compared to the rate obtained in th ... | 2003 | 12760892 |
| pcr detection of seven virulence and toxin genes of campylobacter jejuni and campylobacter coli isolates from danish pigs and cattle and cytolethal distending toxin production of the isolates. | to study the prevalence of seven virulence and toxin genes, and cytolethal distending toxin (cdt) production of campylobacter jejuni and c. coli isolates from danish pigs and cattle. | 2003 | 12752808 |
| comparison of recovery methods for freeze-injured listeria monocytogenes, salmonella typhimurium, and campylobacter coli in cell suspensions and associated with pork surfaces. | cells injured as a result of freezing, heating, and acidification treatments may not grow during conventional microbiological procedures owing to the presence of selective agents, compounds, or dyes in the media, impairing the cell's ability to repair itself and grow. injured cells can be recovered by combining selective and nonselective media into a single system. with such combinations, the diffusion of the selective compounds or dyes is controlled, allowing for the resuscitation of injured ce ... | 2003 | 12747688 |
| phenotypic and genotypic differentiation of campylobacter spp. isolated from austrian broiler farms: a comparison. | an identification scheme based on restriction fragment length polymorphism of polymerase chain reaction products (pcr-rflp) was developed to differentiate isolates of the genera campylobacter, arcobacter and helicobacter. based on the 16s rrna gene of these genera, pcr amplified a 1216-bp fragment. the amplicons were digested with the restriction enzymes rsai and ecorv. additional differentiation was obtained using a pcr-assay based on the hippuricase gene. genotyping was performed on several re ... | 2003 | 12745378 |
| usefulness of the microseq 500 16s ribosomal dna-based bacterial identification system for identification of clinically significant bacterial isolates with ambiguous biochemical profiles. | due to the inadequate automation in the amplification and sequencing procedures, the use of 16s rrna gene sequence-based methods in clinical microbiology laboratories is largely limited to identification of strains that are difficult to identify by phenotypic methods. in this study, using conventional full-sequence 16s rrna gene sequencing as the "gold standard," we evaluated the usefulness of the microseq 500 16s ribosomal dna (rdna)-based bacterial identification system, which involves amplifi ... | 2003 | 12734240 |
| antimicrobial-resistant campylobacter species from retail raw meats. | the antimicrobial susceptibilities of 378 campylobacter isolates were determined. resistance to tetracycline was the most common (82%), followed by resistance to doxycycline (77%), erythromycin (54%), nalidixic acid (41%), and ciprofloxacin (35%). campylobacter coli displayed significantly higher rates of resistance to ciprofloxacin and erythromycin than campylobacter jejuni, and campylobacter isolates from turkey meat showed a greater resistance than those from chicken meat. | 2003 | 12732579 |
| in vivo tracking of campylobacter jejuni by using a novel recombinant expressing green fluorescent protein. | campylobacter jejuni is a leading cause of food-borne disease in developed countries. the goal of this study was to develop a plasmid-based reporter system with green fluorescent protein (gfp) to facilitate the study of c. jejuni in a variety of niches. c. jejuni transformants harboring the pmek91 gfp gene (gfp)-containing vector were readily detectable by both fluorescence microscopy and flow cytometry. given the ease of detecting these organisms, additional experiments were performed in which ... | 2003 | 12732559 |
| inhibition of helicobacter pylori growth in vitro by bulgarian propolis: preliminary report. | bee glue (propolis) possesses antimicrobial, anti-inflammatory, anaesthetic and immunostimulating activities. the aim of the study was to evaluate the inhibitory effect of bulgarian propolis on helicobacter pylori growth in vitro. activity of 30% ethanolic extract of propolis (eep) against 38 clinical isolates of h. pylori was evaluated by using the agar-well diffusion method. ethanol was used as a control. in addition, the effect of propolis on the growth of 26 h. pylori and 18 campylobacter st ... | 2003 | 12721318 |
| detection of conserved n-linked glycans and phase-variable lipooligosaccharides and capsules from campylobacter cells by mass spectrometry and high resolution magic angle spinning nmr spectroscopy. | glycomics, the study of microbial polysaccharides and genes responsible for their formation, requires the continuous development of rapid and sensitive methods for the identification of glycan structures. in this study, methods for the direct analysis of sugars from 108 to 1010 cells are outlined using the human gastrointestinal pathogen, campylobacter jejuni. using capillary-electrophoresis coupled with sensitive electrospray mass spectrometry, we demonstrate variability in the lipid a componen ... | 2003 | 12716884 |
| investigation of infectious agents associated with arthritis by reverse transcription pcr of bacterial rrna. | in reactive and postinfectious arthritis the joints are generally sterile but the presence of bacterial antigens and nucleic acids has been reported. to investigate whether organisms traffic to affected joints in these conditions, we performed reverse transcription pcr using universal primers to amplify any bacterial 16s rrna sequences present in synovial fluid. bacterial sequences were detected in most cases, even after treatment of the synovial fluid with dnase, implying the presence of bacter ... | 2003 | 12716447 |
| investigation of infectious agents associated with arthritis by reverse transcription pcr of bacterial rrna. | in reactive and postinfectious arthritis the joints are generally sterile but the presence of bacterial antigens and nucleic acids has been reported. to investigate whether organisms traffic to affected joints in these conditions, we performed reverse transcription pcr using universal primers to amplify any bacterial 16s rrna sequences present in synovial fluid. bacterial sequences were detected in most cases, even after treatment of the synovial fluid with dnase, implying the presence of bacter ... | 2003 | 12716447 |
| prevalence of cytolethal distending toxin production in periodontopathogenic bacteria. | cytolethal distending toxin (cdt) is a newly identified virulence factor produced by several pathogenic bacteria implicated in chronic infection. seventy three strains of periodontopathogenic bacteria were examined for the production of cdt by a hela cell bioassay and for the presence of the cdt gene by pcr with degenerative oligonucleotide primers, which were designed based on various regions of the escherichia coli and campylobacter cdtb genes, which have been successfully used for the identif ... | 2003 | 12682119 |
| antimicrobial resistance of campylobacter jejuni and campylobacter coli isolates from broiler chickens isolated at an irish poultry processing plant. | the antibiotic susceptibility of campylobacter jejuni and campylobacter coli isolates from broiler chickens were determined in order to evaluate the level of antibiotic resistance of campylobacter species in the irish poultry industry. | 2003 | 12680938 |
| antibiotic susceptibility of campylobacter jejuni and campylobacter coli human isolates from bosnia and herzegovina. | 2003 | 12654755 | |
| role of campylobacter jejuni/coli in diarrhoea in ile-ife, nigeria. | campylobacter jejuni/coli are well established causative agents of diarrhoea. in nigeria, gastroenteritis due to c. jejuni was first reported in northern part of the country in 1981 and the south-western part in ile-ife in 1983. | 2002 | 12638844 |
| molecular typing of campylobacter jejuni and campylobacter coli. | 2003 | 12624086 | |
| comparison of broth microdilution, e test, and agar dilution methods for antibiotic susceptibility testing of campylobacter jejuni and campylobacter coli. | a standardized broth microdilution method was compared to the e test and an agar dilution method for the antimicrobial susceptibility testing of campylobacter jejuni and c. coli isolates. a group of 47 human clinical isolates, 37 isolates from retail poultry, and 29 isolates from living turkeys (total, 113 isolates) was included in the study. these encompassed 92 c. jejuni and 21 c. coli strains. the mics of six antimicrobial agents were determined by the broth microdilution and e test methods, ... | 2003 | 12624030 |
| detection and typing of campylobacter jejuni and campylobacter coli and analysis of indicator organisms in three waterborne outbreaks in finland. | waterborne outbreaks associated with contamination of drinking water by campylobacter jejuni are rather common in the nordic countries sweden, norway, and finland, where in sparsely populated districts groundwater is commonly used without disinfection. campylobacters, escherichia coli, or other coliforms have rarely been detected in potential sources. we studied three waterborne outbreaks in finland caused by c. jejuni and used sample volumes of 4,000 to 20,000 ml for analysis of campylobacters ... | 2003 | 12620821 |
| a real-time pcr assay for the detection of campylobacter jejuni in foods after enrichment culture. | a real-time pcr assay was developed for the quantitative detection of campylobacter jejuni in foods after enrichment culture. the specificity of the assay for c. jejuni was demonstrated with a diverse range of campylobacter species, related organisms, and unrelated genera. the assay had a linear range of quantification over six orders of magnitude, and the limit of detection was approximately 12 genome equivalents. the assay was used to detect c. jejuni in both naturally and artificially contami ... | 2003 | 12620820 |
| molecular characterization of fluoroquinolone-resistant campylobacter spp. isolated from poultry. | campylobacteriosis, an infectious disease caused by campylobacter jejuni and campylobacter coli, is treated by fluoroquinolone antibiotics in clinical practices. however, use of these drugs in animal husbandry may select for fluoroquinolone-resistant campylobacters and, thereby, compromise the clinical treatment of infection. in this study, 21 fluoroquinolone-resistant campylobacters were isolated from poultry samples. morphological and biochemical characteristics indicated that 19 isolates were ... | 2003 | 12619802 |
| pcr-restriction fragment length polymorphism analysis for detection of point mutations associated with macrolide resistance in campylobacter spp. | a 23s rrna gene fragment in domain v was sequenced from 30 clinical isolates of campylobacter spp., including 22 resistant to macrolides. two point mutations associated with erythromycin resistance were identified at positions 2074 and 2075 on the 23s rrna gene (homologous to a2142c and a2143g mutations in helicobacter pylori) in which an adenine residue is also replaced with a cytosine and a guanine residue, respectively. a combined pcr-restriction fragment length polymorphism technique was dev ... | 2003 | 12604552 |
| [campylobacter jejuni and c. coli in aborted swine: comparison between phenotypic identification and polyacrylamide gel protein profiles]. | campylobacter jejuni and campylobacter coli were isolated from aborted pig fetuses which proceeded from different animals and farms between february 2000 and march 2001. seven campylobacter jejuni biotype ii, three biotype i and one campylobacter coli biotype i were identified by phenotypic tests and lior's scheme. to corroborate and compare the phenotypic results, 7.5, 10 and 12.5% polyacrilamide gel electrophoresis (sds-page) were used under reducing conditions. characteristic bands of hyperva ... | 2002 | 12600003 |
| occurrence and resistance to antibiotics of campylobacter jejuni and campylobacter coli in animals and meat in northeastern italy. | a study was carried out in northeastern italy during 2000 and 2001 to investigate the occurrence of campylobacter jejuni and campylobacter coli in animals, cattle, pigs, and broilers, and raw meat, beef, pork, and chicken. campylobacter spp. were detected in 53.9% of the cattle, 63.5% of the pigs, and 82.9% of the broilers examined. chicken meat was frequently contaminated (81.3%), while lower rates were found in pork meat (10.3%) and beef (1.3%). the resistance to antibiotics of the strains was ... | 2003 | 12593931 |
| specific detection of arcobacter and campylobacter strains in water and sewage by pcr and fluorescent in situ hybridization. | the aim of this study was to evaluate pcr and fluorescent in situ hybridization (fish) techniques for detecting arcobacter and campylobacter strains in river water and wastewater samples. both 16s and 23s rrna sequence data were used to design specific primers and oligonucleotide probes for pcr and fish analyses, respectively. in order to assess the suitability of the methods, the assays were performed on naturally and artificially contaminated samples and compared with the isolation of cells on ... | 2003 | 12571045 |
| evaluation of broiler litter with reference to the microbial composition as assessed by using 16s rrna and functional gene markers. | very little is known about the microbial composition of animal bedding wastes, including poultry litter, and what is known has been deduced from standard culture methods, by which some fastidious organisms that exist in the environment may not be detected. we evaluated the bacterial composition of poultry litter by using a combination of culture and molecular detection. total aerobic bacteria in poultry litter were detected by culture at 10(9) cfu/g of material. enteric bacteria such as enteroco ... | 2003 | 12571010 |
| the iron-binding protein dps confers hydrogen peroxide stress resistance to campylobacter jejuni. | we identified and characterized the iron-binding protein dps from campylobacter jejuni. electron microscopic analysis of this protein revealed a spherical structure of 8.5 nm in diameter, with an electron-dense core similar to those of other proteins of the dps (dna-binding protein from starved cells) family. cloning and sequencing of the dps-encoding gene (dps) revealed that a 450-bp open reading frame (orf) encoded a protein of 150 amino acids with a calculated molecular mass of 17,332 da. ami ... | 2003 | 12533477 |
| characterization of helicobacter pylori nickel metabolism accessory proteins needed for maturation of both urease and hydrogenase. | previous studies demonstrated that two accessory proteins, hypa and hypb, play a role in nickel-dependent maturation of both hydrogenase and urease in helicobacter pylori. here, the two proteins were purified and characterized. hypa bound two ni(2+) ions per dimer with positive cooperativity (hill coefficient, approximately 2.0). the dissociation constants k(1) and k(2) for ni(2+) were 58 and 1.3 microm, respectively. studies on purified site-directed mutant proteins in each of the five histidin ... | 2003 | 12533448 |
| the gam protein of bacteriophage mu is an orthologue of eukaryotic ku. | mu bacteriophage inserts its dna into the genome of host bacteria and is used as a model for dna transposition events in other systems. the eukaryotic ku protein has key roles in dna repair and in certain transposition events. here we show that the gam protein of phage mu is conserved in bacteria, has sequence homology with both subunits of ku, and has the potential to adopt a similar architecture to the core dna-binding region of ku. through biochemical studies, we demonstrate that gam and the ... | 2003 | 12524520 |
| epidemiology and antimicrobial susceptibilities of 111 campylobacter fetus subsp. fetus strains isolated in québec, canada, from 1983 to 2000. | the epidemiology and antimicrobial susceptibilities of 111 campylobacter fetus subsp. fetus strains isolated from 103 patients from 1983 to 2000 in québec, canada, were determined. the median number of patients infected annually with this bacteria was seven, with an incidence of 0.1 per 100,000 population. the male-to-female ratio was 1.1 to 1.0. the patients originated from 13 of the 18 québec socioeconomic regions. the age range of the patients was 6 months to 90 years old, 53% being > or = 70 ... | 2003 | 12517895 |
| real-time pcr assay for rapid and accurate detection of point mutations conferring resistance to clarithromycin in helicobacter pylori. | the main cause of failure of helicobacter pylori eradication therapy is resistance to clarithromycin. the resistance is due to three point mutations in two positions on the 23s rrna (a2142c, a2142g, and a2143g). our aim was to develop a rapid and accurate method to detect these mutations directly on biopsy specimens. we developed a real-time pcr that included a simultaneous detection of the amplicons by hybridization of two probes labeled with lc-red and fluorescein by using the fluorescence res ... | 2003 | 12517879 |
| evaluation of 11 pcr assays for species-level identification of campylobacter jejuni and campylobacter coli. | we examined the sensitivity and specificity of 11 pcr assays described for the species identification of campylobacter jejuni and campylobacter coli by using 111 type, reference, and field strains of c. jejuni, c. coli, and campylobacter lari. for six assays, an additional 21 type strains representing related campylobacter, arcobacter, and helicobacter species were also included. pcr tests were initially established in the laboratory by optimizing conditions with respect to five type and referen ... | 2003 | 12517869 |
| molecular assays for detection of human metapneumovirus. | the recent description of the respiratory pathogen human metapneumovirus (hmpv) has highlighted a deficiency in current diagnostic techniques for viral agents associated with acute lower respiratory tract infections. we describe two novel approaches to the detection of viral rna by use of reverse transcriptase pcr (rt-pcr). the pcr products were identified after capture onto a solid-phase medium by hybridization with a sequence-specific, biotinylated oligonucleotide probe. the assay was applied ... | 2003 | 12517833 |
| comparative genotyping of campylobacter jejuni by amplified fragment length polymorphism, multilocus sequence typing, and short repeat sequencing: strain diversity, host range, and recombination. | three molecular typing methods were used to study the relationships among 184 campylobacter strains isolated from humans, cattle, and chickens. all strains were genotyped by amplified fragment length polymorphism (aflp) analysis, multilocus sequence typing (mlst), and sequence analysis of a genomic region with short tandem repeats designated clustered regularly interspaced short palindromic repeats (crisprs). mlst and aflp analysis yielded more than 100 different profiles and patterns, respectiv ... | 2003 | 12517820 |
| survival and resuscitation of ten strains of campylobacter jejuni and campylobacter coli under acid conditions. | the culturability of 10 strains of campylobacter jejuni and campylobacter coli was studied after the bacteria were exposed to acid conditions for various periods of time. campylobacter cells could not survive 2 h under acid conditions (formic acid at ph 4). the 10 campylobacter strains could not be recovered, even when enrichment media were used. viable cells, however, could be detected by a double-staining (5-cyano-2,3-ditolyl tetrazolium chloride [ctc]-4',6'-diamidino-2-phenylindole [dapi]) te ... | 2003 | 12514068 |
| enhanced surveillance of campylobacter infection in the north west of england 1997-1999. | to identify sources and routes of infection for sporadic cases of campylobacter infection in the north west of england. | 2003 | 12504607 |
| antimicrobial susceptibilities of campylobacter strains isolated from finnish subjects infected domestically or from those infected abroad. | the in vitro susceptibilities of 678 campylobacter jejuni and campylobacter coli strains isolated from stool samples of the same number of finnish subjects were studied. a total of 523 patients, representing inhabitants from throughout finland, had not traveled abroad within the 2 weeks prior to becoming ill, whereas 155 persons had presumably acquired their infections abroad. the antimicrobial agents studied were erythromycin, ciprofloxacin, levofloxacin, trovafloxacin, and moxifloxacin. the mi ... | 2003 | 12499176 |
| association of helicobacter pylori antioxidant activities with host colonization proficiency. | to assess the importance of two separate antioxidant activities in helicobacter pylori, we tested the abilities of strains with mutations in either tpx (encoding thiolperoxidase) or ahpc (encoding alkyl hydroperoxide reductase [ahpc]) to colonize the stomachs of mice. the tpx strain was clearly more sensitive than the parent strain to both oxygen and cumene hydroperoxide. the strain colonized only 5% of the inoculated mice. two different classes of oxygen-sensitive ahpc mutants in the type strai ... | 2003 | 12496216 |
| resistance to quinolones in campylobacter jejuni and campylobacter coli from danish broilers at farm level. | to investigate the prevalence of quinolone resistance among campylobacter jejuni and camp. coli isolates from danish poultry at the farm level, as well as for the whole country. | 2003 | 12492931 |
| a polyphosphate kinase (ppk2) widely conserved in bacteria. | synthesis of inorganic polyphosphate (poly p) from the terminal phosphate of atp is catalyzed reversibly by poly p kinase (ppk, now designated ppk1) initially isolated from escherichia coli. ppk1 is highly conserved in many bacteria, including some of the major pathogens such as pseudomonas aeruginosa. in a null mutant of p. aeruginosa lacking ppk1, we have discovered a previously uncharacterized ppk activity (designated ppk2) distinguished from ppk1 by the following: synthesis of poly p from gt ... | 2002 | 12486232 |
| rapid pcr using nested primers of the 16s rrna and the hippuricase (hip o) genes to detect campylobacter jejuni and campylobacter coli in environmental samples. | identification of sources campylobacter infection in the poultry houses is in general problematic due to the lack of reliable methods to detect campylobacteria in environmental samples. detection of campylobacteria in environmental samples by conventional culture methods is difficult and of limited sensitivity due to the use of selective media, the low number of bacteria in the samples and possibly also due to the presence of non-culturable or sub-lethally injured stages of the bacteria. the pre ... | 2002 | 12477440 |
| campylobacter jejuni in black-headed gulls (larus ridibundus): prevalence, genotypes, and influence on c. jejuni epidemiology. | campylobacteriosis is a zoonotic disease in which birds have been suggested to play an important role as a reservoir. we investigated the prevalence of campylobacter jejuni subsp. jejuni in black-headed gulls (larus ridibundus) in southern sweden with the aim of examining the nature of c. jejuni infection in this bird species. birds were sampled in four sampling series each year during 1999 (n = 419) and 2000 (n = 365). longitudinally sampled c. jejuni isolates from individual gulls were subject ... | 2002 | 12454158 |
| prevalence of campylobacter jejuni, campylobacter lari, and campylobacter coli in different ecological guilds and taxa of migrating birds. | a total of 1,794 migrating birds trapped at a coastal site in southern sweden were sampled for detection of campylobacter spp. all isolates phenotypically identified as campylobacter jejuni and a subset of those identified as non-c. jejuni were identified to the species level by pcr-based techniques. c. jejuni was found in 5.0% of the birds, campylobacter lari was found in 5.6%, and campylobacter coli was found in 0.9%. an additional 10.7% of the tested birds were infected with hippurate hydroly ... | 2002 | 12450810 |
| molecular diversity of campylobacter coli and c. jejuni isolated from pigs at slaughter by flaa-rflp analysis and ribotyping. | a population of porcine isolates of camplobacter jejuni (n = 11) and c. coli (n = 17) were examined for genotypic relatedness employing ribotyping, as well as polymerase chain reaction-restriction fragment length polymorphism (pcr-rflp) analysis of the flagellin (fla)a gene locus. pcr was employed to amplify a 533 bp fragment from the flaa gene, including the previously described short variable region (svr), employing the novel primers, a2 and al and successfully generated this amplicon for all ... | 2002 | 12449248 |
| speciating campylobacter jejuni and campylobacter coli isolates from poultry and humans using six pcr-based assays. | six previously published polymerase chain reaction (pcr) assays each targeting different genes were used to speciate 116 isolates previously identified as campylobacter jejuni using routine microbiological techniques. of the 116 isolates, 84 were of poultry origin and 32 of human origin. the six pcr assays confirmed the species identities of 31 of 32 (97%) human isolates and 56 of 84 (67%) poultry isolates as c. jejuni. twenty eight of 84 (33%) poultry isolates were identified as campylobacter c ... | 2002 | 12435503 |
| requirement of flha for swarming differentiation, flagellin export, and secretion of virulence-associated proteins in bacillus thuringiensis. | bacillus thuringiensis is being used worldwide as a biopesticide, although increasing evidence suggests that it is emerging as an opportunistic human pathogen. while phospholipases, hemolysins, and enterotoxins are claimed to be responsible for b. thuringiensis virulence, there is no direct evidence to indicate that the flagellum-driven motility plays a role in parasite-host interactions. this report describes the characterization of a mini-tn10 mutant of b. thuringiensis that is defective in fl ... | 2002 | 12426328 |