%0 Journal Article %1 bielaszewska_enterohaemorrhagic_2007 %A Bielaszewska, Martina %A Zhang, Wenlan %A Mellmann, Alexander %A Karch, Helge %D 2007 %J Berliner Und Münchener Tierärztliche Wochenschrift %K Animals, Disease Escherichia Factors Food Humans, Infections, Microbiology, Outbreaks, Shiga Syndrome, Toxins, Virulence Virulence, coli coli, {Hemolytic-Uremic} %N 7-8 %P 279--287 %T Enterohaemorrhagic Escherichia coli O26:H11/H-: a human pathogen in emergence %U http://www.ncbi.nlm.nih.gov/pubmed/17715820 %V 120 %X Enterohaemorrhagic Escherichia coli (EHEC) O26:H11 have emerged as the most important non-O157:H7 EHEC, with respect to their ability to cause diarrhoea and the haemolytic uraemic syndrome (HUS). HUS is a leading cause of acute renal failure in children, and is mainly caused by EHEC expressing Shiga toxins (Stx) 1 and/or 2. Since 1996, EHEC O26, which produce Stx2 only and appear to have enhanced virulence, have been increasingly isolated from HUS patients in Germany. In contrast, EHEC O26 found in cattle predominantly produce Stx1 as the sole Stx. Additional potential virulence factors of EHEC O26 include cytolysins (EHEC hemolysin), serine proteases (EspP), lymphotoxins (Efal) and adhesins (intimin). The genes encoding the virulence factors are located within pathogenicity islands (eae, efa1), bacteriophages (stx) or plasmids (EHEC-hlyA, espP). In addition, EHEC O26 possess, in contrast to other EHEC, the "high pathogenicity island" (HPI), which is also present in pathogenic Yersiniae. This island contains genes involved in the biosynthesis, regulation and transport of the siderophore yersiniabactin. Comparative genomic analyses between EHEC O26 and non-pathogenic E. coli, as well as investigations of mechanisms involved in the transfer of virulence genes, provide a deeper insight into the evolution of EHEC O26. These studies demonstrate how horizontal transfer of virulence genes, even from distantly related organisms, can lead in brief intervals to the rise of a highly virulent clone within a particular E. coli serotype.The classical bacteriological methods are no longer sufficient to determine the risk posed by EHEC O26. However, knowledge of the complete virulence profiles of these pathogens and understanding their stepwise evolution form a foundation for developing new strategies to prevent human infections and new methods for their laboratory diagnosis.

@article{bielaszewska_enterohaemorrhagic_2007, abstract = {Enterohaemorrhagic Escherichia coli {(EHEC)} {O26:H11} have emerged as the most important {non-O157:H7} {EHEC,} with respect to their ability to cause diarrhoea and the haemolytic uraemic syndrome {(HUS).} {HUS} is a leading cause of acute renal failure in children, and is mainly caused by {EHEC} expressing Shiga toxins {(Stx)} 1 and/or 2. Since 1996, {EHEC} O26, which produce Stx2 only and appear to have enhanced virulence, have been increasingly isolated from {HUS} patients in Germany. In contrast, {EHEC} O26 found in cattle predominantly produce Stx1 as the sole Stx. Additional potential virulence factors of {EHEC} O26 include cytolysins {(EHEC} hemolysin), serine proteases {(EspP),} lymphotoxins {(Efal)} and adhesins (intimin). The genes encoding the virulence factors are located within pathogenicity islands (eae, efa1), bacteriophages (stx) or plasmids {(EHEC-hlyA,} {espP).} In addition, {EHEC} O26 possess, in contrast to other {EHEC,} the "high pathogenicity island" {(HPI),} which is also present in pathogenic Yersiniae. This island contains genes involved in the biosynthesis, regulation and transport of the siderophore yersiniabactin. Comparative genomic analyses between {EHEC} O26 and non-pathogenic E. coli, as well as investigations of mechanisms involved in the transfer of virulence genes, provide a deeper insight into the evolution of {EHEC} O26. These studies demonstrate how horizontal transfer of virulence genes, even from distantly related organisms, can lead in brief intervals to the rise of a highly virulent clone within a particular E. coli {serotype.The} classical bacteriological methods are no longer sufficient to determine the risk posed by {EHEC} O26. However, knowledge of the complete virulence profiles of these pathogens and understanding their stepwise evolution form a foundation for developing new strategies to prevent human infections and new methods for their laboratory diagnosis.}, added-at = {2011-03-11T10:05:34.000+0100}, author = {Bielaszewska, Martina and Zhang, Wenlan and Mellmann, Alexander and Karch, Helge}, biburl = {https://www.bibsonomy.org/bibtex/236e210bef8ac0d4e5a800184e26500f7/jelias}, interhash = {c2d221c0a50aed8a59db13bdd905999e}, intrahash = {36e210bef8ac0d4e5a800184e26500f7}, issn = {0005-9366}, journal = {Berliner Und Münchener Tierärztliche Wochenschrift}, keywords = {Animals, Disease Escherichia Factors Food Humans, Infections, Microbiology, Outbreaks, Shiga Syndrome, Toxins, Virulence Virulence, coli coli, {Hemolytic-Uremic}}, month = aug, note = {{PMID:} 17715820}, number = {7-8}, pages = {279--287}, shorttitle = {Enterohaemorrhagic Escherichia coli O26}, timestamp = {2011-03-11T10:06:03.000+0100}, title = {Enterohaemorrhagic Escherichia coli {O26:H11/H-:} a human pathogen in emergence}, url = {http://www.ncbi.nlm.nih.gov/pubmed/17715820}, volume = 120, year = 2007 }