Bibliografias temáticas / Escherichia coli O1113:H21

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Literatura científica selecionada sobre o tema "Escherichia coli O1113:H21"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 3 de fevereiro de 2022

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Artigos de revistas sobre o assunto "Escherichia coli O1113:H21"

Bettelheim, Karl A. "Non-O157 Verotoxin-Producing Escherichia coli: A Problem, Paradox, and Paradigm". Experimental Biology and Medicine 228, n.º 4 (abril de 2003): 333–44. http://dx.doi.org/10.1177/153537020322800402.

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The problems associated with identification and characterization of non-O157 verotoxin-producing Escherichia coli (VTEC) are discussed. The paradox of VTEC is that most reports of human illnesses are associated with serotypes such as O157:H7, O111:H– (nonmotile), O26:H11, and O113:H21, which are rarely found in domestic animals. However, those VTEC serotypes commonly found in domestic animals, especially ruminants, rarely cause human illnesses. When they cause human illnesses, the symptoms are similar to those caused by the serotypes E. coli O157:H7, O111:H–, O26:H11, and O113:H21. The impact of VTEC on human and animal health is also addressed. The VTEC and their toxicity are considered as a paradigm for emerging pathogens. The question on how such pathogens could arise from a basic commensal population is also addressed.

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Miko, Angelika, Karin Pries, Sabine Haby, Katja Steege, Nadine Albrecht, Gladys Krause e Lothar Beutin. "Assessment of Shiga Toxin-Producing Escherichia coli Isolates from Wildlife Meat as Potential Pathogens for Humans". Applied and Environmental Microbiology 75, n.º 20 (21 de agosto de 2009): 6462–70. http://dx.doi.org/10.1128/aem.00904-09.

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ABSTRACT A total of 140 Shiga toxin-producing Escherichia coli (STEC) strains from wildlife meat (deer, wild boar, and hare) isolated in Germany between 1998 and 2006 were characterized with respect to their serotypes and virulence markers associated with human pathogenicity. The strains grouped into 38 serotypes, but eight O groups (21, 146, 128, 113, 22, 88, 6, and 91) and four H types (21, 28, 2, and 8) accounted for 71.4% and 75.7% of all STEC strains from game, respectively. Eighteen of the serotypes, including enterohemorrhagic E. coli (EHEC) O26:[H11] and O103:H2, were previously found to be associated with human illness. Genes linked to high-level virulence for humans (stx 2, stx 2d, and eae) were present in 46 (32.8%) STEC strains from game. Fifty-four STEC isolates from game belonged to serotypes which are frequently found in human patients (O103:H2, O26:H11, O113:H21, O91:H21, O128:H2, O146:H21, and O146:H28). These 54 STEC isolates were compared with 101 STEC isolates belonging to the same serotypes isolated from farm animals, from their food products, and from human patients. Within a given serotype, most STEC strains were similar with respect to their stx genotypes and other virulence attributes, regardless of origin. The 155 STEC strains were analyzed for genetic similarity by XbaI pulsed-field gel electrophoresis. O103:H2, O26:H11, O113:H21, O128:H2, and O146:H28 STEC isolates from game were 85 to 100% similar to STEC isolates of the same strains from human patients. By multilocus sequence typing, game EHEC O103:H2 strains were attributed to a clonal lineage associated with hemorrhagic diseases in humans. The results from our study indicate that game animals represent a reservoir for and a potential source of human pathogenic STEC and EHEC strains.

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Bugarel, Marie, Lothar Beutin e Patrick Fach. "Low-Density Macroarray Targeting Non-Locus of Enterocyte Effacement Effectors (nle Genes) and Major Virulence Factors of Shiga Toxin-Producing Escherichia coli (STEC): a New Approach for Molecular Risk Assessment of STEC Isolates". Applied and Environmental Microbiology 76, n.º 1 (30 de outubro de 2009): 203–11. http://dx.doi.org/10.1128/aem.01921-09.

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ABSTRACT Rapid and specific detection of Shiga toxin-producing Escherichia coli (STEC) strains with a high level of virulence for humans has become a priority for public health authorities. This study reports on the development of a low-density macroarray for simultaneously testing the genes stx 1, stx 2, eae, and ehxA and six different nle genes issued from genomic islands OI-122 (ent, nleB, and nleE) and OI-71 (nleF, nleH1-2, and nleA). Various strains of E. coli isolated from the environment, food, animals, and healthy children have been compared with clinical isolates of various seropathotypes. The eae gene was detected in all enteropathogenic E. coli (EPEC) strains as well as in enterohemorrhagic E. coli (EHEC) strains, except in EHEC O91:H21 and EHEC O113:H21. The gene ehxA was more prevalent in EHEC (90%) than in STEC (42.66%) strains, in which it was unequally distributed. The nle genes were detected only in some EPEC and EHEC strains but with various distributions, showing that nle genes are strain and/or serotype specific, probably reflecting adaptation of the strains to different hosts or environmental niches. One characteristic nle gene distribution in EHEC O157:[H7], O111:[H8], O26:[H11], O103:H25, O118:[H16], O121:[H19], O5:H−, O55:H7, O123:H11, O172:H25, and O165:H25 was ent/espL2, nleB, nleE, nleF, nleH1-2, nleA. (Brackets indicate genotyping of the flic or rfb genes.) A second nle pattern (ent/espL2, nleB, nleE, nleH1-2) was characteristic of EHEC O103:H2, O145:[H28], O45:H2, and O15:H2. The presence of eae, ent/espL2, nleB, nleE, and nleH1-2 genes is a clear signature of STEC strains with high virulence for humans.

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Luck, Shelley N., Luminita Badea, Vicki Bennett-Wood, Roy Robins-Browne e Elizabeth L. Hartland. "Contribution of FliC to Epithelial Cell Invasion by Enterohemorrhagic Escherichia coli O113:H21". Infection and Immunity 74, n.º 12 (18 de setembro de 2006): 6999–7004. http://dx.doi.org/10.1128/iai.00435-06.

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ABSTRACT Enterohemorrhagic Escherichia coli (EHEC) O113:H21 can invade epithelial cells. In this study, we found that invasion but not adherence was inhibited by anti-FliCH21 specific antibodies. In addition, deletion of fliCH21 from EHEC O113:H21 resulted in an eightfold decrease in invasion that was restored upon transcomplementation with fliCH21 but not with fliCH6 . These results suggested that FliC plays an important role in the pathogenesis of infections caused by EHEC O113:H21 by allowing bacteria to penetrate the intestinal epithelium.

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Bielaszewska, Martina, Marina Fell, Lilo Greune, Rita Prager, Angelika Fruth, Helmut Tschäpe, M. Alexander Schmidt e Helge Karch. "Characterization of Cytolethal Distending Toxin Genes and Expression in Shiga Toxin-Producing Escherichia coli Strains of Non-O157 Serogroups". Infection and Immunity 72, n.º 3 (março de 2004): 1812–16. http://dx.doi.org/10.1128/iai.72.3.1812-1816.2004.

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ABSTRACT We identified cytolethal distending toxin and its gene (cdt) in 17 of 340 non-O157 Shiga toxin-producing Escherichia coli (STEC) strains (serotypes O73:H18, O91:H21, O113:H21, and O153:H18), all of which were eae negative. cdt is either chromosomal and homologous to cdt-V (serotypes O73:H18, O91:H21, and O113:H21) or plasmidborne and identical to cdt-III (serotype O153:H18). Among eae-negative STEC, cdt was associated with disease (P = 0.003).

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Paton, Adrienne W., e James C. Paton. "Molecular Characterization of the Locus Encoding Biosynthesis of the Lipopolysaccharide O Antigen of Escherichia coliSerotype O113". Infection and Immunity 67, n.º 11 (1 de novembro de 1999): 5930–37. http://dx.doi.org/10.1128/iai.67.11.5930-5937.1999.

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ABSTRACT Shiga toxigenic Escherichia coli (STEC) strains are a diverse group of organisms capable of causing severe gastrointestinal disease in humans. Within the STEC family, eae-positive STEC strains, particularly those belonging to serogroups O157 and O111, appear to have greater virulence for humans. However, in spite of beingeae negative, STEC strains belonging to serogroup O113 have frequently been associated with cases of severe STEC disease, including hemolytic-uremic syndrome (HUS). Western blot analysis with convalescent-phase serum from a patient with HUS caused by an O113:H21 STEC strain indicated that human immune responses were directed principally against lipopolysaccharide O antigen. Accordingly, the serum was used to isolate a clone expressing O113 O antigen from a cosmid library of O113:H21 DNA constructed in E. coli K-12. Sequence analysis indicated that the O113 O-antigen biosynthesis (rfb) locus contains a cluster of nine genes which may be cotranscribed. Comparison with sequence databases identified candidate genes for four glycosyl transferases, an O-acetyl transferase, an O-unit flippase, and an O-antigen polymerase, as well as copies of galE and gnd. Two additional, separately transcribed genes downstream of the O113 rfbregion were predicted to encode enzymes involved in synthesis of activated sugar precursors, one of which (designated wbnF) was essential for O113 O-antigen synthesis, and so is clearly a part of the O113 rfb locus. Interestingly, expression of O113 O antigen by E. coli K-12 significantly increased in vitro adherence to both HEp-2 and Henle 407 cells.

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Shen, Songhai, Mariola Mascarenhas, Kris Rahn, James B. Kaper e Mohamed A. Karmal. "Evidence for a Hybrid Genomic Island in Verocytotoxin-Producing Escherichia coli CL3 (Serotype O113:H21) Containing Segments of EDL933 (Serotype O157:H7) O Islands 122 and 48". Infection and Immunity 72, n.º 3 (março de 2004): 1496–503. http://dx.doi.org/10.1128/iai.72.3.1496-1503.2004.

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ABSTRACT Genomic O island 122 (OI-122) of the verocytotoxin-producing Escherichia coli (VTEC) strain EDL933 contains four putative virulence genes, Z4321, Z4326, Z4332, and Z4333. However, strain CL3 (serotype O113:H21) contains only Z4321, not the other three genes. To determine whether Z4321 is part of a different genomic island in CL3, a region of 27,293 bp up- and downstream of Z4321 was sequenced and found to contain elements of two different EDL933 genomic islands (OI-48 and OI-122) and a Yersinia pestis-like hemolysin/adhesin gene cluster. The region contained OI-48 genes Z1635, Z1636, and Z1637 at the left terminus and Z1641, Z1642, Z1643, and Z1644 at the right. The middle portion consisted of OI-48 gene Z1640, which was separated into three fragments by genomic segments including the Y. pestis cluster and EDL933 OI-122 genes Z4322, Z4321, and Z4318. In a PCR investigation of 36 VTEC strains of different serotypes, intact Z1640 was present in strains of serotypes O157:H7, O26:H11, O103:H2, O111:NM, and O145:NM, which are associated with hemolytic uremic syndrome and outbreaks. In contrast, fragmented Z1640 was seen in strains of nonepidemic serotypes, such as O91:H21 and O113:H21, and in animal serotypes that have not been associated with human disease, indicating that Z1640 might be a virulence gene.

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Luck, Shelley N., Vicki Bennett-Wood, Rachael Poon, Roy M. Robins-Browne e Elizabeth L. Hartland. "Invasion of Epithelial Cells by Locus of Enterocyte Effacement-Negative Enterohemorrhagic Escherichia coli". Infection and Immunity 73, n.º 5 (maio de 2005): 3063–71. http://dx.doi.org/10.1128/iai.73.5.3063-3071.2005.

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ABSTRACT The majority of enterohemorrhagic Escherichia coli (EHEC) strains associated with severe disease carry the locus of enterocyte effacement (LEE) pathogenicity island, which encodes the ability to induce attaching and effacing lesions on the host intestinal mucosa. While LEE is essential for colonization of the host in these pathogens, strains of EHEC that do not carry LEE are regularly isolated from patients with severe disease, although little is known about the way these organisms interact with the host epithelium. In this study, we compared the adherence properties of clinical isolates of LEE-negative EHEC with those of LEE-positive EHEC O157:H7. Transmission electron microscopy revealed that LEE-negative EHEC O113:H21 was internalized by Chinese hamster ovary (CHO-K1) epithelial cells and that intracellular bacteria were located within a membrane-bound vacuole. In contrast, EHEC O157:H7 remained extracellular and intimately attached to the epithelial cell surface. Quantitative gentamicin protection assays confirmed that EHEC O113:H21 was invasive and also showed that several other serogroups of LEE-negative EHEC were internalized by CHO-K1 cells. Invasion by EHEC O113:H21 was significantly reduced in the presence of the cytoskeletal inhibitors cytochalasin D and colchicine and the pan-Rho GTPase inhibitor compactin, whereas the tyrosine kinase inhibitor genistein had no significant impact on bacterial invasion. In addition, we found that EHEC O113:H21 was invasive for the human colonic cell lines HCT-8 and Caco-2. Overall these studies suggest that isolates of LEE-negative EHEC may employ a mechanism of host cell invasion to colonize the intestinal mucosa.

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dos Santos, Luis Fernando, Kinue Irino, Tânia Mara Ibelli Vaz e Beatriz Ernestina Cabilio Guth. "Set of virulence genes and genetic relatedness of O113 : H21 Escherichia coli strains isolated from the animal reservoir and human infections in Brazil". Journal of Medical Microbiology 59, n.º 6 (1 de junho de 2010): 634–40. http://dx.doi.org/10.1099/jmm.0.015263-0.

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Escherichia coli strains of serotype O113 : H21 are commonly described as belonging to a Shiga toxin (Stx)-producing E. coli (STEC) pathotype worldwide. Albeit this STEC serotype is frequently identified among cattle and other domestic animals, to the best of our knowledge no human infections associated with STEC O113 : H21 have been registered in Brazil to date. Here, we report the virulence profile and genetic relatedness of a collection of O113 : H21 E. coli strains mainly isolated from the animal reservoir aimed at determining their potential as human pathogens. The strains from the animal reservoir (n=34) were all classified as STEC, whereas the few isolates recovered so far from human diarrhoea (n=3) lacked stx genes. Among the STEC, the stx 2d-activatable gene was identified in 85 % of the strains that also carried lpfA O113, iha, saa, ehxA, subAB, astA, cdt-V, espP, espI and epeA; the human strains harboured only lpfA O113, iha and astA. All the strains except one, isolated from cattle, were genetically classified as phylogenetic group B1. High mass plasmids were observed in 25 isolates, but only in the STEC group were these plasmids confirmed as the STEC O113 megaplasmid (pO113). Many closely related subgroups (more than 80 % similarity) were identified by PFGE, with human isolates clustering in a subgroup separate from most of the animal isolates. In conclusion, potentially pathogenic O113 : H21 STEC isolates carrying virulence markers in common with O113 : H21 clones associated with haemolytic uraemic syndrome cases in other regions were demonstrated to occur in the natural reservoir in our settings, and therefore the risk represented by them to public health should be carefully monitored.

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Feng, Peter C. H., Sabine Delannoy, David W. Lacher, Luis Fernando dos Santos, Lothar Beutin, Patrick Fach, Marta Rivas, Elizabeth L. Hartland, Adrienne W. Paton e Beatriz E. C. Guth. "Genetic Diversity and Virulence Potential of Shiga Toxin-Producing Escherichia coli O113:H21 Strains Isolated from Clinical, Environmental, and Food Sources". Applied and Environmental Microbiology 80, n.º 15 (23 de maio de 2014): 4757–63. http://dx.doi.org/10.1128/aem.01182-14.

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ABSTRACTShiga toxin-producingEscherichia colistrains of serotype O113:H21 have caused severe human diseases, but they are unusual in that they do not produce adherence factors coded by the locus of enterocyte effacement. Here, a PCR microarray was used to characterize 65 O113:H21 strains isolated from the environment, food, and clinical infections from various countries. In comparison to the pathogenic strains that were implicated in hemolytic-uremic syndrome in Australia, there were no clear differences between the pathogens and the environmental strains with respect to the 41 genetic markers tested. Furthermore, all of the strains carried only Shiga toxin subtypes associated with human infections, suggesting that the environmental strains have the potential to cause disease. Most of the O113:H21 strains were closely related and belonged in the same clonal group (ST-223), but CRISPR analysis showed a great degree of genetic diversity among the O113:H21 strains.

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Mais fontes

Teses / dissertações sobre o assunto "Escherichia coli O1113:H21"

Srimanote, Potjanee. "Analysis of putative virulence factors of a locus of enterocyte effacement-negative shiga-toxigenic Escherichia coli O113:H21 strain". Title page, contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09php863.pdf.

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"February 2003." Addendum and corrigenda inserted at back Includes bibliographical references (leaves 249-272) Aims to identify and characterise potential virulence-associated factors from the locus of enterocyte effacement-negative shiga-toxigenic Escherichia coli O113:H21 strain 98NK2 which was responsible for an outbreak of haemolytic uremic syndrome. Particular attention was focused on putative virulence genes encoded on the megaplasmid of this strain.

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Hong, Yingying. "Evaluation of chromosomally-integrated luxCDABE and plasmid-borne GFP markers for the study of localization and shedding of STEC O91:H21 in calves". 2011. http://trace.tennessee.edu/utk_gradthes/881.

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Shiga toxin-producing Escherichia coli (STEC) has been recognized as an important foodborne pathogen. Of this group, O91 is one of the common serogroups frequently isolated from patients and food in some countries, with O91:H21 being previously implicated in hemolytic uremic syndrome (HUS). Cattle are principle reservoirs for STEC, and studies examining STEC shedding in cattle often include experimental inoculation of strains of interest using antibiotic resistance markers for identifiable recovery. However, indigenous fecal microbes exhibiting similar resistance patterns can confound such studies. Such was the case in a study by our group when attempting to characterize shedding patterns of O91:H21 in calves, leading us to seek other, more effective, markers. Among our strategies was the development of a chromosomally integrated bioluminescence marker via transposon mutagenesis using a luxCDABE cassette from Photorhabdus luminescens and a plasmid borne GFP marker via transformation of the pGFP vector. The luxCDABE marker was inserted on host chromosome at a site that was 27 nucleotides before the stop codon of gene yihL and confirmed to have little impact on important virulence genes and growth rate with a very high stability. In contrast, plasmid borne GFP marker showed poor stability without the application of appropriate antibiotic selection pressure. For calves receiving luxCDABE-marked O91:H21, the fecal counts of the organismranged from 1.2 x 10 3 to 1.3 x 10 4CFU/g at two days post inoculation and decreased to 5.8 to 8.7 x 10 2 CFU/g or undetectable level after two weeks.Intestinal contents sampled from various positions at day 14 post inoculation indicated that cecum and descending colon may be the primary localization sites of this O91:H21 strain. Compared to antibiotic resistance markers, the use of bioluminescence markers does not require the restricted pre-inoculation screening of animals. The enumeration of luxCDABE-marked O91:H21 from feces and intestinal contents was easily accomplished and confirmed reliable by M-PCR analysis under the presence of indigenous bacteria which cannot be eliminated by antibiotic-supplemented selective plates. Therefore, the chromosomal integrated luxCDABE marker may be a better model for the study of STEC colonization and shedding in cattle.

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Trabalhos de conferências sobre o assunto "Escherichia coli O1113:H21"

Beserra, L. Justo, A. M. Figueiredo Cerqueira, K. G. de Lima Araújo, J. R. Costa Andrade e A. G. Martins Gonzalez. "Behavior of Shiga-toxin-producing Escherichia coli (STEC) of serotype O113:H21 to front pH, water activity, time and temperature". In Proceedings of the III International Conference on Environmental, Industrial and Applied Microbiology (BioMicroWorld2009). WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814322119_0077.

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Hong, Yingying, e Alan G. Mathew. "Characterization of a chromosomally integrated luxCDABE marker for investigation of shiga toxin-producing Escherichia coli O91:H21 shedding in cattle". In SPIE Defense, Security, and Sensing, editado por Sárka O. Southern, Kevin N. Montgomery, Carl W. Taylor, Bernhard H. Weigl, B. V. K. Vijaya Kumar, Salil Prabhakar e Arun A. Ross. SPIE, 2011. http://dx.doi.org/10.1117/12.884394.

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