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Non-O157:H7 Shiga toxin (verocytotoxin)-producing Escherichia coli strains: epidemiological significance and microbiological diagnosis

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Abstract

Shiga toxin (Stx)-producing Escherichia coli (STEC) are important causes of diarrhoea and the haemolytic uremic syndrome (HUS). The most common STEC serotype implicated worldwide is E. coli O157:H7 that is diagnosed using procedures based on its typical phenotypic feature, the lack of sorbitol fermentation. In addition to E. coli O157:H7, a variety of non-O157:H7 STEC strains that usually ferment sorbitol and are thus missed by using the diagnostic protocol for E.coli O157:H7 have been isolated from patients. Among these sorbitol-fermenting (SF) non-O157:H7 STEC, SF E. coli O157:H− and non-O157 STEC strains of serogroups O26, O103, O111 and O145 have emerged as significant causes of HUS and diarrhoea in continental Europe and have been associated with human disease in other parts of the world. Microbiological diagnosis of non-O157:H7 STEC strains is difficult due to their serotype diversity and the absence of a simple biochemical property that distinguishes such strains from the physiological intestinal microflora. Screening for non-O157:H7 STEC and their isolation from stools is presently based on the detection of Stx production or stx genes that are common characteristics of such strains. Molecular subtyping of the most frequent non-O157 STEC demonstrated that strains of serogroups O26, O103 and O111 belong to their own clonal lineages and show unique virulence profiles. SF STEC O157:H− strains that have been isolated mostly in Central Europe represent a new clone within E. coli O157 serogroup which has its own typical combination of virulence factors.

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  1. Institute for Medical Microbiology, The 2nd Medical Faculty, Charles University, Prague, V Úvalu 84, 150 06 Prague, Czech Republic

    Martina Bielaszewska

  2. Institute for Hygiene and Microbiology, University of Würzburg, Josef-Schneider-Str. 2, 97080, Würzburg, Germany

    Martina Bielaszewska & Helge Karch

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  1. Martina Bielaszewska
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Bielaszewska, M., Karch, H. Non-O157:H7 Shiga toxin (verocytotoxin)-producing Escherichia coli strains: epidemiological significance and microbiological diagnosis. World Journal of Microbiology and Biotechnology 16, 711–718 (2000). https://doi.org/10.1023/A:1008972605514

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