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for invention","granted":false,"earliest_filing_date":"2009-08-11","application_expiry_date":"2011-09-10","has_disclaimer":false,"patent_status":"DISCONTINUED","publication_count":1,"has_spc":false,"has_grant_event":false,"has_entry_into_national_phase":false},"abstract":{"en":[{"text":"The present invention relates to a process to perform a molecular risk assessment (MRA) upon a sample suspected to contain a Shiga toxin-encoding Escherichia coli (STEC), comprising the steps: \ncontacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes stx1 , stx2 and eae ; \nwherein the process is characterised in that it also comprises contacting the sample or DNA isolated therefrom with a pair of primers derived from the following target genes nleB , nleH1-2 , nleE , ent / espL2 and detecting the presence or the absence of an amplification product for each of the target genes.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"}]},"abstract_lang":["en"],"has_abstract":true,"claim":{"en":[{"text":"A process to perform a molecular risk assessment (MRA) upon a sample suspected to contain a Shiga toxin-encoding Escherichia coli (STEC), comprising the steps:\n contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n - stx1; \n - stx2; \n - eae; \n wherein said process is characterised in that it also comprises contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n - nleB ; \n - nleH1-2 ; \n - nleE ; \n - ent / espL2 ; \n and detecting the presence or the absence of an amplification product for each of said target genes.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A process to perform a molecular risk assessment (MRA) upon a sample known to contain a Shiga toxin-encoding Escherichia coli (STEC), comprising the steps:\n contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n - nleB ; \n - nleH1-2 ; \n - nleE ; \n - entlespL2 ; \n and detecting the presence or the absence of an amplification product for each of said target genes.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A process according to claim 1 or 2, further comprising contacting said sample or DNA isolated therefrom with a pair of primers derived from at least one of the following target genes:\n - ehxA ; \n - ehxA; \n - nleF ; \n - nleA.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The process according to any one of claims 1 to 3, wherein said pair of primers for each of said target genes comprise for:\n - stx1 at least one primer defined by SEQ ID NO: 1 or SEQ ID NO: 2, or a fragment of at least fifteen nucleotides thereof; \n - stx2 at least one primer defined by SEQ ID NO: 4 or SEQ ID NO: 5, or a fragment of at least fifteen nucleotides thereof; \n - eae at least one primer defined by SEQ ID NO: 7 or SEQ ID NO: 8, or a fragment of at least fifteen nucleotides thereof; \n - nleB at least one primer defined by SEQ ID NO: 16 or SEQ ID NO: 17, or a fragment of at least fifteen nucleotides thereof; \n - nleH1-2 at least one primer defined by SEQ ID NO: 25 or SEQ ID NO: 26, or a fragment of at least fifteen nucleotides thereof; \n - nleE at least one primer defined by SEQ ID NO: 19 or SEQ ID NO: 20, or a fragment of at least fifteen nucleotides thereof; \n - entlespL2 at least one primer defined by SEQ ID NO: 13 or SEQ ID NO: 14, or a fragment of at least fifteen nucleotides thereof; \n - ehxA at least one primer defined by SEQ ID NO: 10 or SEQ ID NO: 11, or a fragment of at least fifteen nucleotides thereof; \n - nleF at least one primer defined by SEQ ID NO: 22 or SEQ ID NO: 23, or a fragment of at least fifteen nucleotides thereof; \n - nleA at least one primer defined by SEQ ID NO: 28 or SEQ ID NO: 29, or a fragment of at least fifteen nucleotides thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The process according to claim 4, wherein said amplification products are detected using a degenerate probe defined by the following sequence for each target gene:\n - stx1 , SEQ ID NO: 3, or a fragment of at least fifteen nucleotides thereof; \n - stx2 , SEQ ID NO: 6, or a fragment of at least fifteen nucleotides thereof; \n - eae, SEQ ID NO: 9, or a fragment of at least fifteen nucleotides thereof; \n - ehxA, SEQ ID NO: 12, or a fragment of at least fifteen nucleotides thereof; \n - nleF , SEQ ID NO: 24, or a fragment of at least fifteen nucleotides thereof; \n - nleB , SEQ ID NO: 18, or a fragment of at least fifteen nucleotides thereof; \n - nleH1-2 , SEQ ID NO: 27, or a fragment of at least fifteen nucleotides thereof; \n - nleE , SEQ ID NO: 21, or a fragment of at least fifteen nucleotides thereof; \n - nleA , SEQ ID NO: 30, or a fragment of at least fifteen nucleotides thereof; \n - entlespL2 , SEQ ID NO: 15, or a fragment of at least fifteen nucleotides thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The process according to any one of claims 1 to 5, further comprising performing a negative PCR control and/or an inhibition control; \nand detecting the presence or the absence of an amplification product from said reactions.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The process according to claim 5, wherein said probes are labelled with at least one fluorescent label.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The process according to any one of claims 1 to 7, wherein said process comprises a multiplex amplification reaction.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The process according to any one of claims 1 to 7, wherein said process comprises a series of independent amplification reactions.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The process according to any one of claims 1 to 9, wherein amplification reactions are performed on a macroarray.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The process according to any one of claims 1 to 10, wherein said amplification reactions are a real time PCR reactions.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A process to determine the serotype of a STEC strain based upon the pattern of target genes present in a sample comprising said STEC strain, wherein said process comprises the steps of:\n contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n - nleB ; \n - nleH1-2 ; \n - nleE ; \n - entlespL2 ; \n - nleF ; \n - nleA; \n and detecting the presence or the absence of an amplification product for each of said target genes.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A kit for the detection of EHEC strains, comprising the sets of primers defined in claim 1, 2 or 12, and optionally the degenerate probes defined in claim 5.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"An isolated nucleic acid molecule consisting of the amplification product resulting from a process according to any one of claims 1 to 12.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"}]},"claim_lang":["en"],"has_claim":true,"description":{"en":{"text":"Since the early 1980s, Shiga toxin-producing Escherichia coli (STEC) have emerged as a major cause of food-borne infections (Karmali et al.1983, Riley et al.1983). STEC can cause diarrhea in humans and some STEC strains may cause life-threatening diseases such as Hemorrhagic Colitis (HC) and Haemolytic Uraemic Syndrome (HUS). According to their human pathogenicity the latter strains were also designated as enterohaemorrhagic E. coli (EHEC) (Levine 1987, Nataro and Kaper 1998). Numerous cases of HC and HUS have been attributed to EHEC serotype O157:H7 strains, but it has now been recognized that other serotypes of STEC belong to the EHEC group. A STEC seropathotype classification (from A to E) based upon the serotype association with human epidemics, HUS and diarrhea has been developed as an aid to assess the clinical and public health risks associated with non-O157 EHEC and STEC strains (Karmali et al.2003). Recent data from Enter-Net, a global surveillance consortium of 35 countries that tracks enteric infectious diseases, showed that the number of human diseases caused by non-O157 STEC and EHEC increased globally by 60.5% between 2000 and 2005, while at the same time the number of cases linked to EHEC O157 increased by only 13% (Anonymous 2005). Among the top five of non-O157 EHEC serotypes most frequently implicated in hemorrhagic diseases in 2005, 80% belong to seropathotype B and 20% belong to seropathotype C (Anonymous 2005). None belong to the less-virulent STEC seropathotypes D and E, suggesting that selection for highly virulent strains is currently taking place. The production of Shiga toxin by EHEC is the primary virulence trait responsible for HUS, but many E . coli non-O157:H7 strains that produce Shiga toxin do not cause HUS. Identification of human virulent STEC by unique detection of stx genes may be misleading since not all STEC strains are clinically significant to humans (EFSA 2007). In addition, to produce one or both types of Shiga toxins, typical EHEC strains harbour a genomic island, called the \"locus of enterocyte effacement\" (LEE). The LEE carries genes encoding functions for bacterial colonization of the gut and for destruction of the intestinal mucosa thus contributing to the disease process (Nataro and Kaper 1998). The LEE encoded eae-gene product intimin is directly involved in attaching and effacing (A/E) process and serves as an indicator for the A/E function in the bacteria (Zhang et al.2002). The LEE includes regulatory elements, a type III secretion system (TTSS), secreted effector proteins, and their cognate chaperon (Elliott et al.1998, Perna et al.1998). In addition to the intimin, most of the typical EHEC strains harbour the plasmid encoded enterohaemolysin ( ehxA ) which is considered as an associated virulence factor (Nataro and Kaper 1998). However, the LEE and the enterohaemolysin are not found in all STEC causing HC and HUS and the corresponding strains were designated as atypical EHEC (Nataro and Kaper 1998). Atypical EHEC are less frequently involved in hemorrhagic diseases than typical EHEC, but are a frequent cause of diarrhea, indicating additional virulence determinants play a role in the pathogenicity (Brooks et al.2005, Eklund et al.2001). Virulence in bacterial pathogens is modulated by the acquisition of mobile genetic elements such as genomic islands (Lawrence 2005). One class of genomic islands, called pathogenicity islands (PAIs) constitute a flexible gene pool contributing to pathogen evolution and virulence potential and can be used as a genetic signature of new and emerging pathogens. A huge number of type III effectors which are encoded by PAIs outside the LEE have been described in EHEC and in enteropathogenic E . coli (EPEC) strains. Techniques exist to determine the presence of a STEC contamination in a sample by for instance detecting the presence of the stx1 / stx2 genes and the eae gene (Loukiadis et al.2006). But as explained above the genetic basis of STEC pathogenicity is a lot more complex than the presence or absence of one or both of these genes. In a complex sample, which may comprise a mixture of strains, the presence of the stx1 / 2 genes and the LEE is also not always indicative of the presence of an EHEC in this sample. Therefore no reliable tests exist at the present time to determine whether a STEC contaminant is pathogenic and in particular an EHEC strain. Given that some EHEC strains can cause very serious health problems in humans, workers using existing methods must discard a sample whenever a STEC strain is detected therein; even though it is likely this STEC does not pose a threat to human health. Existing methods therefore result in a large amount of wastage due to lack of discrimination between non-pathogenic STEC strains and EHEC strains. Therefore a more complex and nuanced assay is required to allow a more complete molecular risk assessment to be performed upon a sample suspected of comprising a STEC, this new assay should be able to determine the risk posed/pathogenicity of a particular contaminating STEC strain. This assay should also because of its increased complexity allow the identification of known virulent EHEC strains which can not at the present time be routinely identified in a sample. The present invention therefore provides a process to perform a molecular risk assessment (MRA) upon a sample suspected to contain a Shiga toxin-encoding Escherichia coli (STEC), comprising the steps:\n contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n stx1 ; stx2 ; eae; wherein said process is characterised in that it also comprises contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n nleB ; nleH1-2 ; nleE ; entlespL2 ; and detecting the presence or the absence of an amplification product for each of said target genes. This process allows a detailed molecular risk assessment to be made upon a sample suspected of containing a STEC contaminant and in this risk assessment a worker can identify which of the panel of selected target genes the contaminant comprises and from this determine whether this contaminant pose a threat to human health or not. In particular this process maybe used to determine whether or not a STEC strain is an EHEC strain. The inventors have shown that the presence of all these target genes in a strain correlates with the strain being an EHEC strain. The stx1 and stx2 genes encode the shiga toxins and their presence is therefore essential for pathogenicity. The eae gene (intimin) is encoded by the LEE genomic island and is therefore a useful marker for this genomic island which is known to be associated with EHEC strains. The nle genes can be derived from different mobile genetic elements, including genomic islands. The inventors focused their efforts on the detection of the genes of two genomic islands : the OI#122 genes ent / espL2 (Z4326) , nleB (Z4328) , nleE (Z4329) and the OI#71 genes: nleF (Z6020) , nleH1-2 (Z6021) , nleA (Z6024 ). They found that the OI#122 genes ent / espL2 (Z4326) , nleB (Z4328) , nleE (Z4329) and the OI#71 gene nleH1-2 (Z6021) (names in brackets are unique Genbank identifiers), were closely associated with typical EHEC strains. This process therefore allows a worker to routinely determine firstly whether or not a sample comprises a STEC contaminant and secondly allows a worker to determine whether or not this STEC strain is likely to be an EHEC strain. All the steps of this process can be performed at the same time using for instance a series of amplification reactions or a multiplex amplification reaction. By way of example, a multiplex amplification reaction based on the GeneDisc® system has been used by the inventors. The GeneDisc® system is a recent innovation in the field of DNA amplification using GeneSystems® PCR technology (Beutin et al.2009) which allows the simultaneous detection of multiple targets in reaction microchambers preloaded with the reagents necessary for detecting and quantifying the required targets (Beutin et al.2009, Yaradou et al.2007). Alternatively the steps can be performed at different times. For instance a sample can be initially analysed for the presence of the stx1 , stx2 and eae genes. If the results of this reaction are positive the sample can then be analysed for the presence of the remaining virulence determinants nleB , nleH1-2 , nleE and ent / espL2 and a MRA made using both sets of results. In the present invention any set of suitable primers may be used to amplify a target gene so as to produce a detectable amplification product. Most normally this will be a pair of primers separated by a number of base pair from each other in the target gene. However a single primer may be used if this leads to a detectable amplification product or alternatively more than two primers may be used to amplify one or more of the target genes. All such variations are encompassed by the present invention. In particular the present invention provides a process to perform a MRA upon a sample suspected to contain a STEC, comprising the steps:\n contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n stx1 , using at least one primer defined by SEQ ID NO: 1 or SEQ ID NO: 2, or a fragment of at least fifteen nucleotides thereof; stx2 using at least one primer defined by SEQ ID NO: 4 or SEQ ID NO: 5, or a fragment of at least fifteen nucleotides thereof; eae using at least one primer defined by SEQ ID NO: 7 or SEQ ID NO: 8, or a fragment of at least fifteen nucleotides thereof; wherein said process is characterised in that it also comprises contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n nleB using at least one primer defined by SEQ ID NO: 16 or SEQ ID NO: 17, or a fragment of at least fifteen nucleotides thereof; nleHl-2 using at least one primer defined by SEQ ID NO: 25 or SEQ ID NO: 26, or a fragment of at least fifteen nucleotides thereof; nleE using at least one primer defined by SEQ ID NO: 19 or SEQ ID NO: 20, or a fragment of at least fifteen nucleotides thereof; ent / espL2 using at least one primer defined by SEQ ID NO: 13 or SEQ ID NO: 14, or a fragment of at least fifteen nucleotides thereof; and detecting the presence or the absence of an amplification product for each of said target genes. The inventors have found that this process can be used to identify a wide range of O157 EHEC strains as well as other pathogenic EHEC strains of different serotypes for instance O103, O111, O26, O145, O5, O55, O45, O118, O112, O121, O123, O165, O172, O15. All eae -negative STEC stains were also negative for the set of nle genes investigated in this study. In contrast, nle genes were present in typical EHEC, including the new emerging serotypes. Atypical EHEC i.e. 091:H21 and O113:H21 known to rarely cause outbreaks and being of low incidence (EFSA 2007) tested negative for the nle genes. The inventors have therefore shown that the simultaneous detection of the Shiga-toxins ( stx1 and stx2 ), intimin ( eae ), together with some non-LEE effectors genes belonging to genomic O-island OI#71 and the module 2 of OI#122 provide a thorough approach for molecular risk assessment of STEC virulence. In particular the process also comprises contacting said sample or DNA isolated therefrom with a pair of primers derived from at least one of the following target genes:\n ehxA using at least one primer defined by SEQ ID NO: 10 or SEQ ID NO: 11, or a fragment of at least fifteen nucleotides thereof; nleF using at least one primer defined by SEQ ID NO: 22 or SEQ ID NO: 23, or a fragment of at least fifteen nucleotides thereof; nleA using at least one primer defined by SEQ ID NO: 28 or SEQ ID NO: 29, or a fragment of at least fifteen nucleotides thereof. The ehxA gene is present upon the plasmid pO157 frequently found in EHEC strains. The genes nleF (Z6020 ) and nleA (Z6024 ) issued from O-Island 71 PAI were unequally distributed in EHEC isolates and their prevalence was respectively of 72.76% and 79% that is much lower than the prevalence of nleH1-2 (Z6021) which was found to be absent in only one strain 026:H11 among the various strains tested by the inventors. The amplification products according to the present invention can be generated using any suitable DNA amplification technique such as PCR either in simplex or multiplex forms, using any of the various natural or engineered enzymes available for this purpose. Alternative methods such as nucleic acid sequence-based amplification (NASBA), branched DNA, strand displacement amplification and the loop-mediated isothermal amplification (LAMP) method (Compton 1991, Chang 1991, Walker et al.1992, Notomi et al.2000) could also be used to generate the amplification products. In particular the amplification products, when present, are detected using a degenerate probe defined by the following sequence for each target gene:\n stx1 , SEQ ID NO: 3, or a fragment of at least fifteen nucleotides thereof; stx2, SEQ ID NO: 6, or a fragment of at least fifteen nucleotides thereof; eae, SEQ ID NO: 9, or a fragment of at least fifteen nucleotides thereof; ehxA, SEQ ID NO: 12, or a fragment of at least fifteen nucleotides thereof; nleF , SEQ ID NO: 24, or a fragment of at least fifteen nucleotides thereof; nleB , SEQ ID NO: 18, or a fragment of at least fifteen nucleotides thereof; nleH1-2 , SEQ ID NO: 27, or a fragment of at least fifteen nucleotides thereof; nleE , SEQ ID NO: 21, or a fragment of at least fifteen nucleotides thereof; nleA, SEQ ID NO: 30, or a fragment of at least fifteen nucleotides thereof; ent / espL2 , SEQ ID NO: 15, or a fragment of at least fifteen nucleotides thereof. In particular the process further comprises performing a negative amplification control and/or an inhibition control; \nand detecting the presence or the absence of an amplification product from said reactions. In processes which concern aspects of human health, it is desirable as far as possible to ensure the results of the assay are as accurate and dependable as possible. In order to do this the assay may comprise a number of internal and external controls to ensure that the results of the assay are representative of the true contents of the sample. Therefore the present process may comprise a negative amplification control to ensure any detected products are true positives and also the process may comprise an inhibition control to ensure that the DNA from the sample is able to be amplified and hence that no false negatives are generated. In addition to these types of internal experimental controls, the process may also be performed a number of times and the results pooled so as to achieve a more representative result. In particular the probes are labelled with at least one fluorescent label. Non-limiting examples of suitable fluorescent labels include 6-carboxylfluorescein (FAM), tetrachloro-6-carboxyfluorescein (TET), 6-carboxy-X-rhodamine (ROX). Non-limitative examples of suitable quenchers for labelling dual-labelled probes include 6-carboxy-tetramethyl-rhodamine (TAMRA), DABCYL, Non-Fluorescent Quenchers such as quenchers of the Black Hole Quencher family (BHQ), or including a minor groove binder group (MGB). In particular wherein the amplification products are generated using a multiplex amplification reaction. Alternatively the amplification products are generated using a series of independent/simplex amplification reactions. In particular wherein the amplification reactions are performed in a macroarray. The inventors preferred means for performing the process is a GeneDisc array which allows the simultaneous testing of the genes encoding Shiga toxins 1 and 2 ( stx 1 and stx 2), intimins (eae), enterohaemolysin ( ehxA) and six different nle genes derived from genomic islands OI#71 and OI#122 (module 2). The EHEC associated virulence determinants were reliably detected with the GeneDisc assay, presenting it as a suitable detection tool for routine diagnostics. In contrast to many other diagnostic tests, the results are obtained without need for special laboratory equipment and for specifically trained personnel and the assay is performed in a very short time. Such a low density macro-array would represent thus an innovative and efficient molecular risk assessment tool for routine monitoring of STEC isolates and for identification of classical and new emerging EHEC strains. In particular wherein the amplification reaction is a real time PCR reaction. Real time PCR, also called quantitative real time polymerase chain reaction (qPCR) or kinetic polymerase chain reaction, is used to amplify and simultaneously quantify a targeted DNA molecule. It enables both detection and quantification (as absolute number of copies or relative amount when normalized to DNA input or additional normalizing genes) of a specific sequence in a DNA sample. The procedure follows the general principle of polymerase chain reaction; its key feature is that the amplified DNA is quantified as it accumulates in the reaction in real time after each amplification cycle (Mackay 2007). Two common methods of quantification are the use of fluorescent dyes that intercalate with double-strand DNA, and modified DNA oligonucleotide probes that fluoresce when hybridized with a complementary DNA (Mackay 2007). A preferred RT-PCR method uses the GeneDisc system as outlined below. According to a further aspect of the present invention there is provided a process to perform a molecular risk assessment upon a STEC strain, wherein said process is characterised in that it also comprises contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n nleB using at least one primer defined by SEQ ID NO: 16 or SEQ ID NO: 17, or a fragment of at least fifteen nucleotides thereof; nleH1-2 using at least one primer defined by SEQ ID NO: 25 or SEQ ID NO: 26, or a fragment of at least fifteen nucleotides thereof; nleE using at least one primer defined by SEQ ID NO: 19 or SEQ ID NO: 20, or a fragment of at least fifteen nucleotides thereof; ent / espL2 using at least one primer defined by SEQ ID NO: 13 or SEQ ID NO: 14, or a fragment of at least fifteen nucleotides thereof; \nand detecting the presence or the absence of an amplification product for each of said target genes. In addition to the specified primers, other primers to the specified target genes can also be used and are encompassed by this aspect of the present invention. The present invention therefore also provides a process to perform a molecular risk assessment upon a sample known to comprise a STEC strain. Wherein the presence of the listed target genes indicates the STEC strain is likely to be an EHEC strain and hence hazardous to human health. According to a further aspect of the present invention there is provided a method to predict the serotype of a STEC strain based upon the pattern of nle genes present in a sample. This method comprises the steps of:\n contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:\n nleB using at least one primer defined by SEQ ID NO: 16 or SEQ ID NO: 17, or a fragment of at least fifteen nucleotides thereof; nleH1-2 using at least one primer defined by SEQ ID NO: 25 or SEQ ID NO: 26, or a fragment of at least fifteen nucleotides thereof; nleE using at least one primer defined by SEQ ID NO: 19 or SEQ ID NO: 20, or a fragment of at least fifteen nucleotides thereof; ent / espL2 using at least one primer defined by SEQ ID NO: 13 or SEQ ID NO: 14, or a fragment of at least fifteen nucleotides thereof; nleF using at least one primer defined by SEQ ID NO: 22 or SEQ ID NO: 23, or a fragment of at least fifteen nucleotides thereof; nleA using at least one primer defined by SEQ ID NO: 28 or SEQ ID NO: 29, or a fragment of at least fifteen nucleotides thereof; and detecting the presence or the absence of an amplification product for each of said target genes. The inventors have found that the pattern of nle genes present in a strain differs between different strains and hence can be used to distinguish between different EHEC strains. One characteristic nle pattern [ ent / espL2 , nleB , nleE , nleF , nleH1-2 , nleA ] was found associated with EHEC O157:[H7], O111:[H8], O26:[H11], O103:[H25], O118:[H16], O121:[H19], O112:[H19], O5:[H NM ], O55:[H7], O123:[H11], O172:[H25], and O165:[H25] strains. Interestingly, sorbitol-fermenting (SF) O157:[H NM ], stx2 strains and O-rough:[H7] ( stx2 , eae -gamma) strains, that were previously identified as positive for the rfbE O157 gene showed the same typical virulence profile. This approach can also be used to identify a number of new emerging EHEC strains that were recently reported as severe human pathogens. One of these is the EHEC O103:H25 type strain, responsible for a foodborne outbreak of HUS in Norway in 2006 (Schimmer et al.2008), which had the same nle profile as EHEC O157:[H7], that is [ ent / espL2 , nleB, nleE, nleF , nleH1-2 , nleA ]. Another emerging EHEC type 05:H NM strain isolated from beef, dairy products and human patients with HC (McLean et al.2005) shows the same nle pattern [ ent / espL2 , nleB , nleE , nleF , nleH1-2, nleA ]. Interestingly, EHEC O118:H16/H NM currently emerging as a new highly virulent STEC type in Europe (Maidhof et al.2002) shows this same nle pattern [ en / espL2 , nleB , nleE , nleF , nleH1-2, nleA ] that is characteristic for EHEC O157:H7 and most of the typical EHEC strains tested. The inventors have found that not all EHEC possess a complete (all six nle target genes listed above) nle pattern. EHEC strains of serotypes O103:H2, O145:H28 showed a second characteristic nle pattern with positive signals for only [ ent / espL2 , nleB, nleE, nleH1-2 ]. Other newly emerging EHEC O15:H2 and 045:H2, which are highly virulent clones involved in HUS, were found to possess the same nle pattern [ ent / espL2 , nleB, nleE, nleH1-2 ] as EHEC O103:H2 and O145:H28 strains. The overall results indicate that EHEC constitute a heterogeneous group sharing a common core of nle virulence determinants but also harbour many variable nle genes that are strain and/or serotype specific, probably reflecting adaptation of these strains to different host or environmental niche. It is noteworthy that the presence in the same strain of a core of virulence determinants [ eae, entlespL2 , nleB, nleE, and nleH1-2 ] is a strong signature of a pathogenic EHEC that can cause human morbidity and mortality. The inventors have shown that these virulence factors are found in all typical EHEC and also in new emerging EHEC types in Europe and North-America e.g. O5:H NM (McLean et al.2005), O15:H2 (Starr et al.1998), O118:H16 (Maidhof et al.2002), O121:H19 (Brooks et al.2005). In particular therefore wherein the nle pattern is:\n [ ent / espL2 , nleB, nleE, nleF , nleH1-2 , nleA ], the EHEC strain is likely to belong to the group comprising: EHEC O157:[H7], O111:[H8], 026:[H11], O118:[H16], O121:[H19], O112:[H19], 05:[HNM], 055:[H7], O123:[H11], O172:[H25], O165:[H25], O157:[H NM ], O103:[H25], O5:[H NM ], O118:[H16/H NM ]; or [ ent / espL2 , nleB, nleE, nleH1-2 ], the EHEC strain is likely to belong to the group comprising: EHEC O103:[H2], O145:[H28], O15:[H2] and O45:[H2]. In addition a number of stx -negative, eae -positive E. coli strains belong to EHEC associated serotypes which resemble EHEC strains according to their eae -genotypes and their nle -gene pattern. It seems likely that these strains represent remnants of EHEC strains that have lost their stx genes. Thus, the nle -genotyping assay could be helpful to detect remnants of EHEC in HUS-patients which were reported to excrete frequently EHEC that have lost their stx -genes with their faeces (Bielaszewska et al.2007). The nle genes, in different distributions, were also detected in some EPEC strains (0113:H6, O127:H6, 0128:H2, 0156:H8, 055:H6, 055:H7, 084:H2 and 086:H40). Contrary to the results reported by Creuzburg and Schmidt (2007), the EPEC strain E2348/69 (O127:H6) was tested positive for the nleA (Z6024) in our study. The fact that these EPEC strains carry multiple types of nle genes is a clear indication of the role these effectors might play in EPEC induced diarrhea in infants. These nle genes were absent in Enterobacteriaceae species that are frequently isolated from human feces and in fecal E . coli that represent the stool flora of healthy infants. That is another evidence that nle virulotyping is suitable for a rapid characterization of highly virulent Stx -positive E. coli strains. In accordance with a further aspect of the present invention there is provided a kit for the detection of shiga toxin producing organisms, comprising at least a set of primers for the target genes:\n nleB ; nleH1-2 ; nleE ; entlespL2 ; \nand optionally a set of probes as to detect the amplification products for each target gene. In accordance with a further aspect of the present invention there is provided an isolated nucleic acid molecule consisting of the amplification product resulting from a process according to the present invention. There will now be described by way of example a specific mode contemplated by the Inventors. In the following description numerous specific details are set forth in order to provide a thorough understanding. It will be apparent however, to one skilled in the art, that the present invention may be practiced without limitation to these specific details. In other instances, well known methods and structures have not been described so as not to unnecessarily obscure the description. Example 1. Materials and Methods Principle of the GeneDisc array The principle of the GeneDisc array (GeneSystems, Bruz, France) has been previously reported (Beutin et al.2009). It is based on real-time PCR applications of multiple targets in a plastic reaction tray engraved with reaction microchambers preloaded with desiccated PCR primers and TaqMan® probes labeled either with the reporter dye 6-FAM (490-520 nm) or ROX (580-620 nm). Properties of the GeneDisc array developed in this study The \"virulotyping GeneDisc\" is designed for simultaneous examination of six different samples, each being tested for ten EHEC specific gene targets, and together with negative and inhibition controls. It has the following settings: microwell 1) negative PCR control (6-FAM label) and PCR inhibition control (ROX-label), microwell 2) stx 2 (FAM) and stx 1 (ROX), microwell 3) ent / espL2 (FAM) and nleF (ROX), microwell 4) nleB (FAM) and nleH1-2 (ROX), microwell 5) nleE (FAM) and nleA (ROX), and microwell 6) ehxA (FAM) and eae (ROX). The oligonucleotide primers and gene probes used in the GeneDisc are described in Table 1. Primers and probes used for detecting stx1, stx2 , eae and ehxA were described previously (Nielsen and Andersen 2003, Perelle et al.2004) and were evaluated in the \"VTEC Screening\" GeneDisc in a recent study (Beutin et al.2009). All oligonucleotides were purchased from Sigma-Aldrich (St. Quentin Fallavier, France). GeneDisc spotting and manufacturing were performed by GeneSystems (Bruz, France). In Table 1 the sequence of oligonucleotides Y is (C, T), S is (C, G), W is (A, T), R is (A, G), M is (A, C). K is (G, T); H is (A,T,C); and D is (G,A,T); FAM = 6-carboxylfluorescein; ROX = carboxy-X-rhodamine; BHQ = Black Hole Quencher. * complementary strand; a: gene encoding Shiga-toxin 1; b: gene encoding Shiga-toxin 2; c: gene encoding intimin; d: gene encoding enteroharemolysin; e: gene encoding the \"putative non LEE effector ent/espL2\"; f: gene encoding the \"putative non LEE effector B\"; g: gene encoding the \"putative non LEE effector E\"; h: gene encoding the \"putative non LEE effector F\"; I: gene encoding the \"putative non LEE effector H1-2\"; gene encoding the \"putative non LEE effector A\". Bacterial strains investigated with the GeneDisc array Strains of E . coli and other Enterobacteriaceae that were investigated for their virulence gene content with the \"virulotyping GeneDisc\" were from the collection of the National Reference Laboratory for E. coli at the Federal Institute for Risk Assessment (BfR) in Berlin, Germany; and from the French Food Safety Agency (AFSSA) in Maisons-Alfort, France. For evaluation we used STEC reference strains and eae -positive \"Attaching and Effacing E . coli\" (AEEC) that were previously characterized for their stx - and eae -genotypes (Beutin et al. 2007, Kozub-Witkowski et al. 2008). For reference strains of EHEC O-groups 026, 0103, 0111, 0145 and 0157 we used strains previously identified by serotyping of their O- and H-antigens and by fliC genotyping (Beutin et al. 2004). The characteristics and origin of EHEC reference strains H19 (O26:H11), PMK5 (0103:H2), CL37 (0111:[H8]), CB7874 (0145:[H28]) and EDL933 (0157:H7) that served as reference had been described in other publications (Beutin et al. 2004, Oswald et al. 2000, Tarr and Whittam 2002). The reference STEC strain EDL933 (0157:H7) and EPEC strain E2348/69 (0127:H6) were used as positive controls for testing the complete set of nle genes i.e. ent / espL2 (Z4326) , nleB (Z4328) , nleE (Z4329), nleF (Z6020) , nleH1-2 (Z6021) and nleA (Z6024) . Strain C600 (E. coli K-12) was taken as a negative control for all genes investigated in this work (Beutin et al. 2007). In addition, 68 enterobacteriaceal strains ( C . sakasaki, Yersinia , Escherichia, Salmonella, Shigella, Citrobacter, Hafnia , Kebsiella , Proteus ) that were characterized by standard methods (Ewing 1986) were used for evaluation of the GeneDisc array. Except for S. dysenteriae type 1 ( stx 1), the S. sonnei strain CB7888 ( stx 1) (Beutin et al. 2007) and the Citrobacter rodentium strain 10835 ( eae ), all other Enterobacteriacae isolates were negative for stx - and eae -genes. For examination, bacteria were cultured to single colonies on Luria-Broth Plates and grown overnight at 37°C. A small aliquot of the colony corresponding to approx. 2x10 6 bacteria was either DNA extracted using the InstaGene matrix (Bio-Rad Laboratories, Marnes La Coquette, France) or directly dissolved in 200 µl sterile water and vortexed thoroughly. 36 µl of the resuspended bacteria or DNA extracts were tested by the GeneDisc array. Example 2. Results Association of eae -types, ehxA gene and nle genes with typical and atypical EHEC strains: 250 EHEC strains including typical EHEC (n=178), atypical EHEC (n=26), and new emerging EHEC strains (n=46) as well as stx -negative strains belonging to the same serotype as the EHEC strains (n=65) were investigated with the virulotyping GeneDisc array (Tables 2, 3 and 4). All EHEC strains were tested positive for either stx1 and/ or stx2 genes giving a total concordance with data previously published (Beutin et al. 2004, Beutin et al. 2009, Fach et al. 2001, Perelle et al. 2004). Eae genes were detected in the strains belonging to the classical EHEC groups 026, 0103, O111, 0145 and 0157 as well as in emerging EHEC type 05, 015, 045, 055, 0112, 0118, 0121, 0123, 0165, and 0172 strains. Only one EHEC 0103:H2 strain tested negative with the eae genes (Table 2). Eae -genes were absent in all other STEC investigated including atypical EHEC 091:H21 and O113:H21, the latter are frequently isolated from food and from human patients (Werber et al. 2008). Remarkably, all eae -negative STEC as well as the atypical EHEC stains were also negative for the set of nle genes investigated in this study (Table 4). In Table 4, the following abbreviations are used: EHEC is enterohaemorrhagic E. coli; STEC is Shiga toxin-producing E. coli; ETEC is enterotoxigenic E. coli; FEC is E. coli isolated from feces of healthy children, EC is E. coli. nle genes encoded by islands OI#71 and OI#122 were present in typical EHEC strains including the new emerging serotypes. One characteristic pattern of nle genes ( entlespL2 , nleB, nleE, nleF , nleH1-2 and nleA ) was found in EHEC strains belonging to serotypes O157:[H7], O111:[H8], O26:[H11], O103:H25, O118:[H16], O121:[H19], O112:H19, 05:NM, O55:H7, O123:H11, 0172:H25, and O165:H25 (Table 2). Among the 76 EHEC 0157:[H7] strains, six were sorbitol-fermenting (SF) O157:H NM , stx2 strains, these showed the same nle pattern as the non-SF O157:[H7] strains. Two O-rough:[H7] ( stx2 , eae- gamma) strains, previously identified as positive for the rfbE O157 gene had the same nle pattern as serologically typable 0157:[H7] strains. Another type of nle pattern was found with EHEC strains belonging to serotypes 0103:H2, 0145:[H28], 045:H2, and O15:H2 strains. These were positive for all nle -genes investigated except for OI#71 encoded genes nleA and nleF (Table 2). Our results indicate that typical EHEC strains are highly conserved for the distribution of nle -genes and point to an association of eae , nle -pattern and serotype. Exceptions were rarely observed, such as absence of the nleH1-2 gene in one of the 34 examined EHEC O26:H11 strains (Table 2). Most (93.25%) of the typical EHEC strains were positive for the plasmid located ehxA gene encoding enterohemolysin, this marker was also present in 87% of new emerging EHEC, 73% of the atypical EHEC and in 42,66% of the other STEC strains investigated in this study. Identification and characterization of Stx -negative strains resembling EHEC for serotype and other properties: It was previously reported that EHEC strains can lose their stx-gene spontaneously during infection and upon subculturing (Friedrich et al. 2007). We were interested to investigate Stx -negative, eae -positive E. coli strains belonging to EHEC associated serotypes for their similarity with EHEC strains in regard to their eae-genotypes and their nle -genes. The results obtained with 65 strains are presented in Table 3. The inventors could identify three stx -negative O157:[H7], ten O26:[H11], one O103:[H2], three O121:[H19], one 0121:[H-], four 055:H7 and one O15:H2 strains that showed similar eae-genotypes and nle patterns as stx -producing EHEC belonging to the same serotypes (Table 3). It seems likely that these strains represent remnants of EHEC strains belonging to these serotypes that have lost their stx -genes. In contrast, a group of fourteen 0157 strains with non H7-flagellae (H NT , H16, H2, H26, H27, H39, H45) was different from EHEC 0157:H7 not only by their H-types but also by the eae-genotypes and absence of most nle genes investigated, except nleH1-2 and nleA. EHEC 0111:[H8] strains were usually positive for eae-theta and for all OI#71 and OI#122 encoded nle genes. Only one of 24 strains was negative with nleF (Table 2). Two single stx -negative O111:H11 strains (eae-beta) showed the same nle profile as EHEC O111:[H8] indicating that transfer of pathogenicity islands might have occurred between different pathogroups of E . coli. Interestingly, EPEC 0111:H2 strains that cause gastroenteritis in infants were found different from EHEC O111:[H8], by their H-type, and by absence of OI#71 encoded nleF and nleA genes (Table 3). An EPEC O111:H19 strain ( eae- eta) was even more distant from EHEC O111:[H8] since it carried none of the nle genes. EHEC 0145:[H28] strains are characterized by possession of the complete set of OI#122 module 2 encoded nle genes ent , nleB and nleE (Table 2). Interestingly, these genes were absent in two stx -negative 0145:[H28] strains which resemble 0145:[H28] EHEC for all other traits that were investigated (Table 3). It is possible that these strains are remnants of EHEC O145:[H28] which have lost their stx genes and the OI#122 PAI. All EPEC 0145 strains (0145:H34, 0145:H4 and 0145:Hr) differed significantly from EHEC 0145:[H28] as they do not possess any nle gene and encode other eae-genotypes. In the group of 0103:H2 strains, the rabbit EPEC strain E22 was similar to all EHEC 0103:H2 strains for the set of nle genes but differed by the eae-beta subtype as EHEC 0103:H2 encode eae -epsilon. In contrast, the EHEC 0103:H25 strain which caused an outbreak of HUS in Norway in 2006 (Schimmer et al. 2008) was found different from the classical EHEC 0103:H2 clone by its H-type, eae-type and the set of nle genes. We additionally investigated representatives of classical EPEC groups. The EPEC 055:H7 strain was similar for its eae-genotype and nle -genes to EHEC 0157:[H7] strains. All nle genes investigated were also present in EPEC 0127:H6, strain E2348/69. EPEC 084:H2 harbored all nle genes except nleE . EPEC 0156:H8 was negative only for the OI#71 nleF and nleA genes. EPEC 0128:H2 and 0113:H6 were only positive for nleH and lacked the OI#122 module 2 associated nle genes. EPEC 055:H6 also lacked the OI#122 module 2 associated nle genes but carried nleH and nleF. In contrast EPEC 086:H40 carried the OI#122 module 2 encoded nle genes but none of those located on OI#71 (Table 3). Some other EPEC strains (0125:H6, 0126:H6, 051, and 076:H51) did not possess any nle gene and usually encoded eae -alpha genotype. These findings pointed to significant differences between EPEC and EHEC strains, not only for their serotypes, but also for their LEE and non LEE associated effectors. Identification and characterisation of eae- and nle -negative strains. Numerous types of STEC are isolated from animals and food but only 5% of these are positive for an eae-gene or belong to the typical EHEC serogroups 026, 0103, 0111, 0145 and 0157 (Beutin et al.2007) . Some of the eae-negative STEC strains are known to cause diarrhea in humans but are rarely involved in hemorrhagic diseases such as HC and HUS (Beutin et al.2004, Friedrich et al.2007, Werber et al.2008). We were interested to investigate representative strains of the eae-negative STEC types that are frequently isolated from food (08, 091, 0100, 0113, 0146, 0128 and 0174). A total of 150 STEC strains that were isolated from food, animals and humans as well as 29 fecal E. coli isolates from healthy children (FEC) were investigated with the virulotyping GeneDisc. The results are summarized in Table 4. None of the eae-negative STEC strains or of the FEC from healthy infants was positive for any of the nle genes, pointing to a close association between presence of the LEE and OI#122 and OI#71 encoded nle genes. In order to examine the possible spread of the OI#122 and OI#71 encoded nle genes to other Enterobacteriaceae we have investigated 68 strains of bacteria comprising Escherichia, Cronobacter, Yersinia , Salmonella, Shigella, Citrobacter, Hafnia , Kebsiella and Proteus species. Except for the two strains of S. dysenteriae type 1 ( stx 1), the S. sonnei strain CB7888 ( stx 1) and the Citrobacter rodentium strain CB10835 ( eae, nleE, nleA )(data not shown), all other Enterobacteriacae isolates were confirmed negative for the genes stx1 and/or stx2 , eae, ehxA and for the nle genes (Table 4). In summary, our results show that the nle virulotyping array is a suitable tool for a rapid identification of human virulent EHEC strains belonging to known and new emerging serotypes in samples which may contain other STEC, other Enterobacteriaceae and human fecal E. coli flora.\n TABLE-tabl0001 Table1. Primers and probes preloaded in the GeneDisc. Target gene sequence Forward primer, reverse primer and probe sequences (5'-3') Location within sequence GenBank accession number Reference stx1 a TTT GTY ACT GTS ACA GCW GAA GCY TTA CG 878-906 CCC CAG TTC ARW GTR AGR TCM ACR TC * 983-1008 M16625 (Perelle et al.2004) ROX- CTG GAT GAT CTC AGT GGG CGT TCT TAT GTA A -BHQ 941-971 stx2 b TTT GTY ACT GTS ACA GCW GAA GCY TTAC G 785-813 CCC CAG TTC ARW GTR AGR TCM ACR TC * 887-912 X07865 (Perelle et al.2004) FAM- TCG TCA GGC ACT GTC TGA AAC TGC TCC -BHQ 838-864 eae c CAT TGA TCA GGA TTT TTC TGG TGA TA 899-924 CTC ATG CGG AAA TAG CCG TTA * 979-1000 Z11541 (Nielsen and Andersen 2003) ROX- AT AGT CTC GCC AGT ATT CGC CAC CAA TAC -BHQ * 936-966 ehxA d GTG TCA GTA GGG AAG CGA ACA 41832-41852 ATC ATG TTT TCC GCC AAT G * 41939-41957 AF074613 This study FAM- CGT GAT TTT GAA TTC AGA ACC GGT GG -BHQ 41868-41893 ent / espl2 e TCC TGG ATT ATT TTC TGC ATT TCA 3929758-3929781 ACT ATT GCC AAG TAC GCC ACA A* 3929833-3929812 AE005174 This study FAM-AAT GGT CAT GCA GAC GCA ATA AAG GCA TA-BHQ 3929783-3929811 nleB f CAT GTT GAA GGC TGG AAS TTT GT 3931502-3931524 CCG CTA CAG GGC GAT ATG TT* 3931573-3931554 AE005174 This study FAM-ACA GAG ACG GGA AAA ACT GGA TGC CA-BHQ 3931527-3931552 nleE g AGA AGC GTT TGA ACC TAT TTC CA 3932207-3932229 TTG GGC GTT TTC CGG ATA T* 3932289-3932271 AE005174 This study FAM-AGC CAG TAC ACC GGA AGG AAG CTG G-BHQ 3932237-3932261 nleF h TGA GGT GAG AAA TGA AAA TAC TGA TG* 2281256-2281231 CTA TCC CTG TCC TCT ATC GTC ATTC 2281182-2281206 AE005174 This study ROX-TGT CGG AGC GCT GAG GGC G-BHQ* 2281226-2281208 nleH1-2 I ACA AGA GAA AGT CAT AGT GGT TG 2282298-2282276 AAT CTC YCC CTT AGG CCA TCC CA* 2282230-2282252 AE005174 This study ROX-TTT ACT AAT CTG TTG CAC AGG-BHQ 2282274-2282254 nleA J AGA TAA CYC TAA TAC TAA ATA TGC C 2285138-2285162 GCC CAA CCA TTG CRC CGA TAT GAG G* 2285274-2285250 AE005174 This study ROX-TTC TTA CCA ATG CTG CCG CAA ATG CGC-BHQ 2285164-2285190 \n TABLE-tabl0002 Table 2. Virulotyping of the eae and nle genes in EHEC strains Serotype Number tested ehxA eae ent / espL2 nleB nleE nleF NleH1-2 nleA Or[157]:H7, \nO157:[H7]* 68 a,b,c ehxA gamma ent/espL2 nleB nleE nleF nleH1-2 nleA O157:[H7] 6 a,b,c ehxA gamma ent/espL2 nleB nleE - nleH1-2 nleA 0157:[H7] 2 a ehxA gamma ent/espL2 nleB nleE - nleH1-2 - 0103:H2 23 a,b,c ehxA epsilon ent/espL2 nleB nleE - nleH1-2 - 0103:H2 2 a,c - epsilon ent/espL2 nleB nleE - nleH1-2 - O103:[H2] 1 ehxA - ent/espL2 nleB nleE - nleH1-2 - O111:[H8] 20 a,c ehxA theta ent/espL2 nleB nleE nleF nleH1-2 nleA 0111:[H-] 2 a ehxA theta ent/espL2 nleB nleE nleF nleH1-2 nleA O111:H8 1 a - theta ent/espL2 nleB nleE nleF nleH1-2 nleA O111:H8 1 a - theta ent/espL2 nleB nleE - nleH1-2 nleA O26:[H11] 21 a,b,c ehxA beta ent/espL2 nleB nleE nleF nleH1-2 nleA O26:[H11] 7 a - beta ent/espL2 nleB nleE nleF nleH1-2 nleA O26:[H11] 4 a,c ehxA beta ent/espL2 nleB nleE - nleH1-2 nleA O26:[H11] 1 a - beta ent/espL2 nleB nleE - nleH1-2 nleA O26:H11 1 a ehxA beta ent/espL2 nleB nleE - - nleA O145:[H28] 17 a,c ehxA gamma ent/espL2 nleB nleE - nleH1-2 - 0145:H28 1 a ehxA gamma ent/espL2 nleB nleE - nleH1-2 nleA O5:H- 12 a,b ehxA beta ent/espL2 nleB nleE nleF nleH1-2 nleA O55:H7 2 a,b - gamma ent/espL2 nleB nleE nleF nleH1-2 nleA 045 :H2 1 a ehxA epsilon ent/espL2 nleB nleE - nleH1-2 - O118:H16 19 a,c ehxA beta ent/espL2 nleB nleE nleF nleH1-2 nleA O118:H16 2 a - beta ent/espL2 nleB nleE nleF nleH1-2 nleA O112ac:H19 1 a - Non-typable ent/espL2 nleB nleE nleF nleH1-2 nleA O121:H19 4 a ehxA epsilon ent/espL2 nleB nleE nleF nleH1-2 nleA O123:H11 1 a ehxA beta ent/espL2 nleB nleE nleF nleH1-2 nleA O165:H25 1 a ehxA epsilon ent/espL2 nleB nleE nleF nleH1-2 nleA 0172:[H25] 1 a ehxA epsilon ent/espL2 nleB nleE nleF nleH1-2 nleA O15:H2 1 a - beta ent/espL2 nleB nleE - nleH1-2 - O103:H25 1 a ehxA theta ent/espL2 nleB nleE nleF nleH1-2 nleA * six of these were SF 0157:NM, and 2 were O-rough:[H7] positive for the rfbE O157 gene. [ ]: genotyping of the flic or rfb genes. a : Clinical isolates; b : Food isolates; c : Animal / environment isolates. \n TABLE-tabl0003 Table 3: Virulotyping of the eae and nle genes in stx -negative strains Serotype Number tested ehxA eae ent / espL2 nleB nleE nleF NleH1-2 nleA O103:H2 1 ehxA epsilon ent/espL2 nleB nleE - nleH1-2 - O103:H2 1* - beta ent/espL2 nleB nleE - nleH1-2 - O111:H11 2 ehxA beta ent/espL2 nleB nleE nleF nleH1-2 nleA O111:[H2] 2 - beta ent/espL2 nleB nleE - nleH1-2 - O111:NM 1 - beta ent/espL2 nleB nleE - nleH1-2 - O1H:H19 2 - eta - - - - - - O111:[H25] 1 - theta ent/espL2 nleB nleE nleF nleH1-2 nleA O145:[H28] 2 ehxA gamma - - - - nleH1-2 - O145 :H34 1 - theta - - - - - - O145 :H4 1 - iota - - - - - - O145:Hr 1 - iota - - - - - - O26:[H11] 7 - beta ent/espL2 nleB nleE nleF nleH1-2 nleA O26:H11 2 ehxA beta ent/espL2 nleB nleE nleF nleH1-2 nleA O26:[H11] 1 ehxA beta ent/espL2 nleB nleE - nleH1-2 nleA O26:[H11] 1 - beta - - - nleF nleH1-2 nleA O26:[H11] 1 - - - - - nleF nleH1-2 nleA O157:H7 1** ehxA gamma ent/espL2 nleB nleE nleF nleH1-2 nleA O157:[H7] 2 ehxA gamma ent/espL2 nleB nleE - nleH1-2 nleA O157:[HNT] 1 - beta - - - - nleH1-2 nleA O157:H16 5 - epsilon - - - - nleH1-2 nleA O157:H2 1 - tau - - - - nleHl-2 nleA O157:H26 2 - beta - - - - nleH1-2 nleA O157:H27 1 ehxA Non-typable - - nleE - - nleA O157:H39 1 ehxA kappa - - nleE - - nleA O157:H45 2 - alpha - - - nleF nleH1-2 nleA O157:H45 1 - alpha - - - nleF nleH1-2 - O15:H2 1 - beta ent/espL2 nleB nleE - nleH1-2 - O55:H7 4 - gamma ent/espL2 nleB nleE nleF nleH1-2 nleA O121:[H-] 1 - epsilon ent/espL2 nleB nleE nleF nleH1-2 nleA O121:H19 3 ehxA epsilon ent/espL2 nleB nleE nleF nleH1-2 nleA O121:H19 1 ehxA - ent/espL2 nleB nleE nleF nleH1-2 nleA O55:H6 1 - iota - - - nleF nleH1-2 - O128:H2 1 - beta - - - - nleH1-2 - O113:H6 1 - beta - - - - nleH1-2 - O127:H6 1*** - alpha ent/espL2 nleB nleE nleF nleH1-2 nleA O156:H8 1 - gamma ent/espL2 nleB nleE - nleH1-2 - O84:H2 1 ehxA zeta ent/espL2 nleB - nleF nleH1-2 nleA O86:H40 1 - theta ent/espL2 nleB nleE - - - O125:H6 1 - alpha - - - - - - O126:H6 1 - alpha - - - - - - O51 1 - alpha - - - - - - O76:H51 1 - gamma - - - - - - *: Reference RDEC strain E22. **: Reference strain ATCC43888. ***: Reference EPEC strain E2348/69. \n TABLE-tabl0004 Table 4. Strains tested negative for the eae and nle genes. Serotype Number tested E. coli /others ehxA 091:H21 11 Atypical EHEC ehxA 091:H21 4 Atypical EHEC - O113:H21 8 Atypical EHEC ehxA O113:H21 3 Atypical EHEC - O100:NM 5 STEC - O105:H18 2 STEC ehxA O109:H- 1 STEC ehxA O110 2 STEC - O111:H10 1 STEC - O113:H4 10 STEC ehxA O113:H4 2 STEC - O115:H18 1 STEC ehxA O116:H28 1 STEC ehxA O117 2 STEC - O118:H12 3 STEC - O125 1 STEC ehxA O126:H8 1 STEC - O128:H2 1 STEC ehxA O136 3 STEC - O138 1 STEC - O139:H1 1 STEC - O139:ND 1 STEC - O141:[H4] 1 STEC - O141:H2 1 STEC - O141ac 1 STEC - O145 1 STEC - O146:H28 1 STEC ehxA O146:H28 4 STEC - O146:H8 1 STEC - O147 1 STEC - O149:[H19] 1 STEC ehxA O15:H16 1 STEC - O168:H8 1 STEC - O171:H2 1 STEC - O174:H- 1 STEC - O174:H2 5 STEC ehxA O174:H21 9 STEC - O174:H8 1 STEC - O174:H8 1 STEC ehxA O178:H19 2 STEC ehxA O2:H27 1 STEC ehxA O21:NM 2 STEC ehxA O21:H21 4 STEC ehxA O22:H16 2 STEC - O22:H16 2 STEC ehxA O22:H8 2 STEC - O22:H8 2 STEC ehxA O22:Hr 1 STEC ehxA O23:H15 1 STEC ehxA O3 2 STEC ehxA O30:H12 1 STEC - O39:H48 1 STEC ehxA O40:H21 1 STEC ehxA O41:H7 1 STEC - O46:H38 2 STEC ehxA O48 2 STEC ehxA O5 1 STEC ehxA O53 2 STEC - O55:H19 1 STEC - O6 8 STEC - O6:H10 1 STEC ehxA O6:H4 1 STEC - O60 1 STEC - O74:H42 1 STEC ehxA O75:H8 1 STEC ehxA O76 1 STEC ehxA O76:H19 1 STEC ehxA O76:H19 1 STEC - O77 2 STEC ehxA O79 1 STEC ehxA O79:H48 1 STEC ehxA O8:H8 2 STEC - O8:H19 4 STEC - O8:H19 1 STEC ehxA O88:H25 1 STEC - O88 1 STEC ehxA O91 1 STEC ehxA O91 5 STEC - O91:H9 1 STEC ehxA O91:H10 3 STEC - O96:H19 1 STEC ehxA Or:H12 1 STEC - Or 2 STEC - Ox7:H16 1 STEC - Or:H16 1 STEC ehxA Or:H4 1 STEC - O26:H32 1 ETEC - O1:K1:NM 1 FEC - O11:NM 1 FEC - O121:H10 2 FEC - O125:H30 1 FEC - O127 1 FEC - O15:H1 1 FEC - O16:K1:NM 1 FEC - O17:H18 1 FEC - O18:K1:H7 1 FEC - O2:H1 1 FEC - O2:H6 1 FEC - O2:K1:H7 1 FEC - O2:NM 1 FEC - O21:H21 1 FEC - O25:K5 1 FEC - O4:H5 4 FEC - O45:K1:H1 1 FEC - O46:K1:H31 1 FEC - O6:K+:NM 1 FEC - O7:K1:NM 1 FEC - O75:K5:NM 1 FEC - O78:NM 1 FEC - O83:K1:H33 1 FEC - O86 1 FEC - Or:NM 1 FEC - O103:H8 1 EC - O111:H8 1 EC - O111:H10 1 EC - O111:H12 1 EC - O111:H21 1 EC - O113:NM 1 EC - O121:[H45] 1 EC - O132 :H18 1 EC - O142 2 EC - O145 2 EC - O145:H2 1 EC - O153:H12 1 EC - O157,O157:[H7 neg] 12 EC - O157:H10 1 EC - O157:H12 1 EC - O157:H15 1 EC - O157:H16 1 EC - O157:H19 1 EC - O157:H25 1 EC - O157:H42 1 EC - O157:H43 1 EC - O2:H1 1 EC - O26:H21 1 EC - O55:H19 1 EC - O6:H4 1 EC - O62:H30 2 EC - O NT :H7 1 EC - O NT 1 EC - N/A 7 Salmonella sp. - N/A 1 Yersinia - N/A 3 Klebsiella - N/A 4 Proteus - N/A 1 Citrobacter - N/A 3 Hafnia - N/A 2 Shigella - N/A 1 C.sakasaki - References \n Anonymous. 2005. 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M. 1987. Escherichia coli That Cause Diarrhea - Enterotoxigenic, Enteropathogenic, Enteroinvasive, Enterohemorrhagic, and Enteroadherent. J. Infect. Dis. 155: 377-389 . Loukiadis, E., Kérourédan, M., Beutin, L., Oswald, E., and Brugère, H., 2006. Characterization of Shiga Toxin Gene (stx)-Positive and Intimin Gene (eae)-Positive Escherichia coli Isolates from Wastewater of Slaughterhouses in France. Appl. Envir. Microbiol., May; 72: 3245 - 3251 . Mackay, I. 2007. Real-time PCR in Microbiology, from diagnosis to characterization. Caister Academic Press, Norfolk, UK . Maidhof, H., B. Guerra, S. Abbas, H. M. Elsheikha, T.S. Whittam, and L. Beutin. 2002. A multiresistant clone of Shiga toxin-producing Escherichia coli O118:[H16] is spread in cattle and humans over different European countries. Appl. Environ. Microbiol. 68(12): 5834-5842 . McLean, C., K. A. Bettelheim, A. Kuzevski, L. Falconer, and S. P. Djordjevic. 2005. Isolation of Escherichia coli 05:H-, possessing genes for Shiga toxin 1, intimin-β and enterohaemolysin, from an intestinal biopsy from an adult case of bloody diarrhoea: evidence for two distinct 05:H- pathotypes. J. Med. Microbiol. 54: 605-607 . Nataro, J. P. and J. B. Kaper. 1998. Diarrheagenic Escherichia coli. Clinical Microbiol. Rev. 11: 142-201 . Nielsen, E. M. and M. T. Andersen. 2003. Detection and characterization of verocytotoxin producing Escherichia coli by automated 5' nuclease PCR assay. J. Clin. Microbiol. 41: 2884-2893 . Notomi, T., Okayama, H., Masubuchi, H., Yonekawa, T., Watanabe, K., Amino, N., and Hase, T. 2000 Loop-Mediated Isothermal Amplification of DNA. Nucleic Acids Research 28, no. 12: E63 . Oswald, E., H. Schmidt, S. Morabito, H. Karch, O. Marches, and A. Caprioli. 2000. Typing of intimin genes in human and animal enterohemorrhagic and enteropathogenic Escherichia coli: characterization of a new intimin variant. Infect. Immun. 68: 64-71 . Perelle, S., F. Dilasser, J. Grout, and P. Fach. 2004. Detection by 5'-nuclease PCR of Shiga toxin producing Escherichia coli 026, 055, 091, 0103, 0111, 0113, 0145 and 0157:H7, associated with the world's most frequent clinical cases. Mol. Cell. Probes. 18: 185-192 . Perna, N. T., G. F. Mayhew, G. Pósfai, S. Elliott, M. S. Donnenberg, J. B. Kaper, and F. R. Blattner. 1998. Molecular evolution of a pathogenicity island from enterohemorrhagic Escherichia coli 0157:H7. Infect Immun. 66(8): 3810-3817 . Riley, L. W., R. S. Remis, S. D. Helgerson, H. B. McGee, J. G. Wells, B. R. Davis, R. J. Hebert, E. S. Olcott, L. M. Johnson, N. T. Hargrett, P. A. Blake, and M. L. Cohen. 1983. Hemorrhagic colitis associated with a rare Escherichia coli serotype. N. Engl. J. Med. 308(12): 681-685 . Schimmer, B., K. Nygard, H.M. Eriksen, J. Lassen, B.A. Lindstedt, L. T. Brandal, G. Kapperud, and P. Aavitsland. 2008. Outbreak of haemolytic uraemic syndrome in Norway caused by stx2-positive Escherichia coli 0103:H25 traced to cured mutton sausages. BMC Infect. Dis. 8:41 Starr, M., V. Bennett-Wood, A. K. Bigham, T. F. de Koning-Ward, A. M. Bordun, D. Lightfoot, K. A. Bettelheim, C. L. Jones, and R. M. Robins-Browne. 1998. Hemolytic-uremic syndrome following urinary tract infection with enterohemorrhagic Escherichia coli: case report and review. Clin Infect Dis. 27(2): 310-315 . Tarr, C. L. and T. S. Whittam. 2002. Molecular evolution of the intimin gene in O111 clones of pathogenic Escherichia coli. J. Bacteriol. 184: 479-487 . Walker, G., Fraiser, M., Schram, J., Little, M., Nadeau, J., and Douglas P. Malinowski, D. 1992 Strand Displacement Amplification-An Isothermal, In Vitro DNA Amplification Technique, Nucleic Acids Research 20, no. 7: 1691-1696 . Werber, D., L. Beutin, R. Pichner, K. Stark, and A. Fruth. 2008. Shiga Toxin-producing Escherichia coli Serogroups in Food and Patients, Germany. Emerg Infect Dis. November; 14(11): 1803-1806 . Yaradou, D. F., S. Hallier-Soulier, S. Moreau, F. Poty, Y. Hillion, M. Reyrolle, J. Andre, G. Festoc, K. Delabre, F. Vandenesch, J. Etienne, and S. Jarraud. 2007. Integrated real-time PCR for detection and monitoring of Legionella. pneumophila in water systems. App. Environment. Microbiol. 73: 1452-1456 . Zhang, W. L., B. Kohler, E. Oswald, L. Beutin, H. Karch, S. Morabito, A. Caprioli, S. Suerbaum, and H. Schmidt. 2002. Genetic diversity of intimin genes of attaching and effacing Escherichia coli strains. J. Clin. 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contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:- stx1;- stx2;- eae;
wherein said process is characterised in that it also comprises contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:- nleB;- nleH1-2;- nleE;- ent/espL2;
and detecting the presence or the absence of an amplification product for each of said target genes."],"number":1,"annotation":false,"title":false,"claim":true},{"lines":["A process to perform a molecular risk assessment (MRA) upon a sample known to contain a Shiga toxin-encoding Escherichia coli (STEC), comprising the steps:
contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:- nleB;- nleH1-2;- nleE;- entlespL2;
and detecting the presence or the absence of an amplification product for each of said target genes."],"number":2,"annotation":false,"title":false,"claim":true},{"lines":["A process according to claim 1 or 2, further comprising contacting said sample or DNA isolated therefrom with a pair of primers derived from at least one of the following target genes:
- ehxA;
- ehxA;
- nleF;
- nleA."],"number":3,"annotation":false,"title":false,"claim":true},{"lines":["The process according to any one of claims 1 to 3, wherein said pair of primers for each of said target genes comprise for:
- stx1 at least one primer defined by SEQ ID NO: 1 or SEQ ID NO: 2, or a fragment of at least fifteen nucleotides thereof;
- stx2 at least one primer defined by SEQ ID NO: 4 or SEQ ID NO: 5, or a fragment of at least fifteen nucleotides thereof;
- eae at least one primer defined by SEQ ID NO: 7 or SEQ ID NO: 8, or a fragment of at least fifteen nucleotides thereof;
- nleB at least one primer defined by SEQ ID NO: 16 or SEQ ID NO: 17, or a fragment of at least fifteen nucleotides thereof;
- nleH1-2 at least one primer defined by SEQ ID NO: 25 or SEQ ID NO: 26, or a fragment of at least fifteen nucleotides thereof;
- nleE at least one primer defined by SEQ ID NO: 19 or SEQ ID NO: 20, or a fragment of at least fifteen nucleotides thereof;
- entlespL2 at least one primer defined by SEQ ID NO: 13 or SEQ ID NO: 14, or a fragment of at least fifteen nucleotides thereof;
- ehxA at least one primer defined by SEQ ID NO: 10 or SEQ ID NO: 11, or a fragment of at least fifteen nucleotides thereof;
- nleF at least one primer defined by SEQ ID NO: 22 or SEQ ID NO: 23, or a fragment of at least fifteen nucleotides thereof;
- nleA at least one primer defined by SEQ ID NO: 28 or SEQ ID NO: 29, or a fragment of at least fifteen nucleotides thereof."],"number":4,"annotation":false,"title":false,"claim":true},{"lines":["The process according to claim 4, wherein said amplification products are detected using a degenerate probe defined by the following sequence for each target gene:
- stx1, SEQ ID NO: 3, or a fragment of at least fifteen nucleotides thereof;
- stx2, SEQ ID NO: 6, or a fragment of at least fifteen nucleotides thereof;
- eae, SEQ ID NO: 9, or a fragment of at least fifteen nucleotides thereof;
- ehxA, SEQ ID NO: 12, or a fragment of at least fifteen nucleotides thereof;
- nleF, SEQ ID NO: 24, or a fragment of at least fifteen nucleotides thereof;
- nleB, SEQ ID NO: 18, or a fragment of at least fifteen nucleotides thereof;
- nleH1-2, SEQ ID NO: 27, or a fragment of at least fifteen nucleotides thereof;
- nleE, SEQ ID NO: 21, or a fragment of at least fifteen nucleotides thereof;
- nleA, SEQ ID NO: 30, or a fragment of at least fifteen nucleotides thereof;
- entlespL2, SEQ ID NO: 15, or a fragment of at least fifteen nucleotides thereof."],"number":5,"annotation":false,"title":false,"claim":true},{"lines":["The process according to any one of claims 1 to 5, further comprising performing a negative PCR control and/or an inhibition control; and detecting the presence or the absence of an amplification product from said reactions."],"number":6,"annotation":false,"title":false,"claim":true},{"lines":["The process according to claim 5, wherein said probes are labelled with at least one fluorescent label."],"number":7,"annotation":false,"title":false,"claim":true},{"lines":["The process according to any one of claims 1 to 7, wherein said process comprises a multiplex amplification reaction."],"number":8,"annotation":false,"title":false,"claim":true},{"lines":["The process according to any one of claims 1 to 7, wherein said process comprises a series of independent amplification reactions."],"number":9,"annotation":false,"title":false,"claim":true},{"lines":["The process according to any one of claims 1 to 9, wherein amplification reactions are performed on a macroarray."],"number":10,"annotation":false,"title":false,"claim":true},{"lines":["The process according to any one of claims 1 to 10, wherein said amplification reactions are a real time PCR reactions."],"number":11,"annotation":false,"title":false,"claim":true},{"lines":["A process to determine the serotype of a STEC strain based upon the pattern of target genes present in a sample comprising said STEC strain, wherein said process comprises the steps of:
contacting said sample or DNA isolated therefrom with a pair of primers derived from the following target genes:- nleB;- nleH1-2;- nleE;- entlespL2;- nleF;- nleA;
and detecting the presence or the absence of an amplification product for each of said target genes."],"number":12,"annotation":false,"title":false,"claim":true},{"lines":["A kit for the detection of EHEC strains, comprising the sets of primers defined in claim 1, 2 or 12, and optionally the degenerate probes defined in claim 5."],"number":13,"annotation":false,"title":false,"claim":true},{"lines":["An isolated nucleic acid molecule consisting of the amplification product resulting from a process according to any one of claims 1 to 12."],"number":14,"annotation":false,"title":false,"claim":true}]}},"filters":{"npl":[],"notNpl":[],"applicant":[],"notApplicant":[],"inventor":[],"notInventor":[],"owner":[],"notOwner":[],"tags":[],"dates":[],"types":[],"notTypes":[],"j":[],"notJ":[],"fj":[],"notFj":[],"classIpcr":[],"notClassIpcr":[],"classNat":[],"notClassNat":[],"classCpc":[],"notClassCpc":[],"so":[],"notSo":[],"sat":[]},"sequenceFilters":{"s":"SEQIDNO","d":"ASCENDING","p":0,"n":10,"sp":[],"si":[],"len":[],"t":[],"loc":[]}}