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Bagel A, Lopez C, David-Briand E, Michel V, Douëllou T, Sergentet D. Serotype-dependent adhesion of Shiga toxin-producing Escherichia coli to bovine milk fat globule membrane proteins. Front Microbiol 2022; 13:1010665. [PMID: 36504830 PMCID: PMC9731836 DOI: 10.3389/fmicb.2022.1010665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 10/10/2022] [Indexed: 11/25/2022] Open
Abstract
Shiga toxin-producing Escherichia coli (STEC) are food-borne pathogens that can cause severe symptoms for humans. Raw milk products are often incriminated as vehicule for human STEC infection. However, raw milk naturally contains molecules, such as the milk fat globule membrane and associated proteins, that could inhibit pathogen adhesion by acting as mimetic ligands. This study aimed to: (i) evaluate the capability of STEC cells to adhere to bovine milk fat globule membrane proteins (MFGMPs), (ii) highlight STEC surface proteins associated with adhesion and (iii) evaluate the variation between different STEC serotypes. We evaluated the physicochemical interactions between STEC and milk fat globules (MFGs) by analyzing hydrophobic properties and measuring the ζ-potential. We used a plate adhesion assay to assess adhesion between MFGMPs and 15 Escherichia coli strains belonging to three key serotypes (O157:H7, O26:H11, and O103:H2). A relative quantitative proteomic approach was conducted by mass spectrometry to identify STEC surface proteins that may be involved in STEC-MFG adhesion. The majority of E. coli strains showed a hydrophilic profile. The ζ-potential values were between -3.7 and - 2.9 mV for the strains and between -12.2 ± 0.14 mV for MFGs. Our results suggest that non-specific interactions are not strongly involved in STEC-MFG association and that molecular bonds could form between STEC and MFGs. Plate adhesion assays showed a weak adhesion of O157:H7 E. coli strains to MFGMPs. In contrast, O26:H11 and O103:H2 serotypes attached more to MFGMPs. Relative quantitative proteomic analysis showed that the O26:H11 str. 21,765 differentially expressed five outer membrane-associated proteins or lipoproteins compared with the O157:H7 str. EDL933. This analysis also found strain-specific differentially expressed proteins, including four O26:H11 str. 21,765-specific proteins/lipoproteins and eight O103:H2 str. PMK5-specific proteins. For the first time, we demonstrated STEC adhesion to MFGMPs and discovered a serotype effect. Several outer membrane proteins-OmpC and homologous proteins, intimin, Type 1 Fimbriae, and AIDA-I-that may be involved in STEC-MFG adhesion were highlighted. More research on STEC's ability to adhere to MFGMs in diverse biological environments, such as raw milk cheeses and the human gastrointestinal tract, is needed to confirm the anti-adhesion properties of the STEC-MFG complex.
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Affiliation(s)
- Arthur Bagel
- Bacterial Opportunistic Pathogens and Environment Research Group, UMR5557 Ecologie Microbienne Lyon, National Center of Scientific Research (CNRS), Université de Lyon, Marcy-l’Etoile, France
| | | | | | | | - Thomas Douëllou
- Bacterial Opportunistic Pathogens and Environment Research Group, UMR5557 Ecologie Microbienne Lyon, National Center of Scientific Research (CNRS), Université de Lyon, Marcy-l’Etoile, France
| | - Delphine Sergentet
- Bacterial Opportunistic Pathogens and Environment Research Group, UMR5557 Ecologie Microbienne Lyon, National Center of Scientific Research (CNRS), Université de Lyon, Marcy-l’Etoile, France,Laboratoire d’Etudes des Microorganismes Alimentaires Pathogènes, VetAgro Sup—Campus Vétérinaire, French National Reference Laboratory for Escherichia coli Including Shiga Toxin-Producing E. coli (NRL-STEC), Université de Lyon, Marcy-l‘Etoile, France,*Correspondence: Delphine Sergentet,
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Douëllou T, Galia W, Kerangart S, Marchal T, Milhau N, Bastien R, Bouvier M, Buff S, Montel MC, Sergentet-Thevenot D. Milk Fat Globules Hamper Adhesion of Enterohemorrhagic Escherichia coli to Enterocytes: In Vitro and in Vivo Evidence. Front Microbiol 2018; 9:947. [PMID: 29867855 PMCID: PMC5963252 DOI: 10.3389/fmicb.2018.00947] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 04/23/2018] [Indexed: 12/13/2022] Open
Abstract
Enterohemorrhagic Escherichia coli (EHEC; E. coli) are food-borne agents associated with gastroenteritis, enterocolitis, bloody diarrhea and the hemolytic-uremic syndrome (HUS). Bovine milk glycans have been shown to contain oligosaccharides which are similar to host epithelial cell receptors and can therefore prevent bacterial adhesion. This study aimed to describe interactions between EHEC O157:H7 EDL933 and O26:H11 21765 and milk fat globules (MFGs) in raw milk and raw milk cheese, and the impact of MFGs on EHEC strains adhesion to the intestinal tract in vitro and in vivo. Both EHEC serotypes clearly associated with native bovine MFGs and significantly limited their adhesion to a co-culture of intestinal cells. The presence of MFGs in raw milk cheese had two effects on the adhesion of both EHEC serotypes to the intestinal tracts of streptomycin-treated mice. First, it delayed and reduced EHEC excretion in mouse feces for both strains. Second, the prime implantation site for both EHEC strains was 6 cm more proximal in the intestinal tracts of mice fed with contaminated cheese containing less than 5% of fat than in those fed with contaminated cheese containing 40% of fat. Feeding mice with 40% fat cheese reduced the intestinal surface contaminated with EHEC and may therefore decrease severity of illness.
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Affiliation(s)
- Thomas Douëllou
- Institut National de Recherche Agronomique, Unité de Recherches Fromagères, Aurillac, France.,Université de Lyon, Research Group "Bacterial Opportunistic Pathogens and Environment", UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, Marcy-l'Étoile, France
| | - Wessam Galia
- Université de Lyon, Research Group "Bacterial Opportunistic Pathogens and Environment", UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, Marcy-l'Étoile, France
| | - Stéphane Kerangart
- Université de Lyon, Research Group "Bacterial Opportunistic Pathogens and Environment", UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, Marcy-l'Étoile, France
| | - Thierry Marchal
- UPSP ICE 2011.03.101 & CRB ANIM (ANR11.INBS.0003), Université de Lyon, VetAgro Sup, Marcy-l'Étoile, France
| | - Nadège Milhau
- UPSP ICE 2011.03.101 & CRB ANIM (ANR11.INBS.0003), Université de Lyon, VetAgro Sup, Marcy-l'Étoile, France
| | - Renaud Bastien
- Department of Collective Behaviour, Max Planck Institute for Ornithology, Konstanz, Germany.,Department of Biology, University of Konstanz, Konstanz, Germany
| | - Marion Bouvier
- Université de Lyon, Research Group "Bacterial Opportunistic Pathogens and Environment", UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, Marcy-l'Étoile, France.,Laboratoire d'Études des Microorganismes Alimentaires Pathogènes - French National Reference Laboratory for Escherichia coli Including Shiga Toxin Producing E. coli, Université de Lyon, VetAgro Sup Campus Vétérinaire, Marcy-l'Étoile, France
| | - Samuel Buff
- UPSP ICE 2011.03.101 & CRB ANIM (ANR11.INBS.0003), Université de Lyon, VetAgro Sup, Marcy-l'Étoile, France
| | - Marie-Christine Montel
- Institut National de Recherche Agronomique, Unité de Recherches Fromagères, Aurillac, France
| | - Delphine Sergentet-Thevenot
- Université de Lyon, Research Group "Bacterial Opportunistic Pathogens and Environment", UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, Marcy-l'Étoile, France.,Laboratoire d'Études des Microorganismes Alimentaires Pathogènes - French National Reference Laboratory for Escherichia coli Including Shiga Toxin Producing E. coli, Université de Lyon, VetAgro Sup Campus Vétérinaire, Marcy-l'Étoile, France
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Douëllou T, Montel M, Thevenot Sergentet D. Invited review: Anti-adhesive properties of bovine oligosaccharides and bovine milk fat globule membrane-associated glycoconjugates against bacterial food enteropathogens. J Dairy Sci 2017; 100:3348-3359. [DOI: 10.3168/jds.2016-11611] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 12/14/2016] [Indexed: 12/11/2022]
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Douëllou T, Delannoy S, Ganet S, Fach P, Loukiadis E, Montel MC, Sergentet-Thevenot D. Molecular characterization of O157:H7, O26:H11 and O103:H2 Shiga toxin-producing Escherichia coli isolated from dairy products. Int J Food Microbiol 2017; 253:59-65. [PMID: 28499121 DOI: 10.1016/j.ijfoodmicro.2017.04.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 04/18/2017] [Accepted: 04/19/2017] [Indexed: 01/10/2023]
Abstract
Pathogenic Shiga toxin-producing E. coli (STEC) are recognized worldwide as environment and foodborne pathogens which can be transmitted by ingestion of ready-to-eat food such as raw milk-derived products. STEC show a prevalence rate in dairy products of 0.9%, yet comparably few outbreaks have been related to dairy products consumption. In this study, we used rt-qPCR to identify the virulence potential of O157, O26 and O103 STEC strains isolated from raw-milk dairy products by analyzing virulence-related gene frequencies and associations with O-island (OI) 44, OI-48, OI-50, OI-57, OI-71 and OI-122. Results showed that 100% of STEC strains investigated harbored genes associated with EHEC-related virulence profile patterns (eae and stx, with either espK, espV, ureD and/or Z2098). We also found similarities in virulence-related gene content between O157:H7 and O103:H2 dairy and non-dairy STEC strains, especially isolates from human cases. The O26:H11-serotype STEC strains investigated harbor the arcA-allele 2 gene associated with specific genetic markers. These profiles are associated with high-virulence seropathotype-A STEC. However, the low frequency of stx2 gene associated with absence of other virulence genes in dairy isolates of O26:H11 remains a promising avenue of investigation to estimate their real pathogenicity. All O26:H11 attaching-effacing E. coli (AEEC) strains carried CRISPRO26:H11SP_O26_E but not genetic markers espK, espV, ureD and/or Z2098 associated with the emerging potentially high-virulence "new French clone". These strains are potentially as "EHEC-like" strains because they may acquire (or have lost) stx gene. In this study, O157:H7, O103:H2 and O26:H11 STEC strains isolated from dairy products were assigned as potential pathogens. However, research now needs to investigate the impact of dairy product environment and dairy processing on the expression of their pathogenicity.
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Affiliation(s)
- T Douëllou
- Institute National de Recherche Agronomique, Unité de Recherches Fromagères, 15000 Aurillac, France; Université de Lyon, Research Group "Bacterial Opportunistic Pathogens and Environment", UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, 69280 Marcy l'Etoile, France.
| | - S Delannoy
- Université Paris-Est, ANSES, Laboratoire de Sécurité des Aliments, Plateforme IdentyPath, 14 rue Pierre et Marie Curie, 94701 Maisons-Alfort, France
| | - S Ganet
- Université de Lyon, Research Group "Bacterial Opportunistic Pathogens and Environment", UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, 69280 Marcy l'Etoile, France; Université de Lyon, VetAgro Sup Campus Vétérinaire, Laboratoire d'Etudes des Microorganismes Alimentaires Pathogènes-French National Reference laboratory for Escherichia coli including Shiga toxin-producing E. coli (NRL-STEC), 69280 Marcy l'Etoile, France
| | - P Fach
- Université Paris-Est, ANSES, Laboratoire de Sécurité des Aliments, Plateforme IdentyPath, 14 rue Pierre et Marie Curie, 94701 Maisons-Alfort, France
| | - E Loukiadis
- Université de Lyon, Research Group "Bacterial Opportunistic Pathogens and Environment", UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, 69280 Marcy l'Etoile, France; Université de Lyon, VetAgro Sup Campus Vétérinaire, Laboratoire d'Etudes des Microorganismes Alimentaires Pathogènes-French National Reference laboratory for Escherichia coli including Shiga toxin-producing E. coli (NRL-STEC), 69280 Marcy l'Etoile, France
| | - M-C Montel
- Institute National de Recherche Agronomique, Unité de Recherches Fromagères, 15000 Aurillac, France
| | - D Sergentet-Thevenot
- Université de Lyon, Research Group "Bacterial Opportunistic Pathogens and Environment", UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, 69280 Marcy l'Etoile, France; Université de Lyon, VetAgro Sup Campus Vétérinaire, Laboratoire d'Etudes des Microorganismes Alimentaires Pathogènes-French National Reference laboratory for Escherichia coli including Shiga toxin-producing E. coli (NRL-STEC), 69280 Marcy l'Etoile, France
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Kerangart S, Douëllou T, Delannoy S, Fach P, Beutin L, Sergentet-Thévenot D, Cournoyer B, Loukiadis E. Variable tellurite resistance profiles of clinically-relevant Shiga toxin-producing Escherichia coli (STEC) influence their recovery from foodstuffs. Food Microbiol 2016; 59:32-42. [PMID: 27375242 DOI: 10.1016/j.fm.2016.05.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 05/04/2016] [Accepted: 05/09/2016] [Indexed: 01/08/2023]
Abstract
Tellurite (Tel)-amended selective media and resistance (Tel-R) are widely used for detecting Shiga toxin-producing Escherichia coli (STEC) from foodstuffs. Tel-R of 81 O157 and non-O157 STEC strains isolated from animal, food and human was thus investigated. Variations of STEC tellurite minimal inhibitory concentration (MIC) values have been observed and suggest a multifactorial and variable tellurite resistome between strains. Some clinically-relevant STEC were found highly susceptible and could not be recovered using a tellurite-based detection scheme. The ter operon was highly prevalent among highly Tel-R STEC but was not always detected among intermediately-resistant strains. Many STEC serogroup strains were found to harbor sublines showing a gradient of MIC values. These Tel-R sublines showed statistically significant log negative correlations with increasing tellurite concentration. Whatever the tellurite concentration, the highest number of resistant sublines was observed for STEC belonging to the O26 serogroup. Variations in the number of these Tel-R sublines could explain the poor recovery of some STEC serogroups on tellurite-amended media especially from food products with low levels of contamination. Comparison of tellurite MIC values and distribution of virulence-related genes showed Tel-R and virulence to be related.
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Affiliation(s)
- Stéphane Kerangart
- University of Lyon, Research Group on «Bacterial Opportunistic Pathogens and Environment», UMR5557 Microbial Ecology, University Lyon 1, CNRS, VetAgro Sup, 69622 Villeurbanne Cedex, France
| | - Thomas Douëllou
- University of Lyon, Research Group on «Bacterial Opportunistic Pathogens and Environment», UMR5557 Microbial Ecology, University Lyon 1, CNRS, VetAgro Sup, 69622 Villeurbanne Cedex, France; Institut National de Recherche Agronomique, Unité de Recherches Fromagères, 15000 Aurillac, France
| | - Sabine Delannoy
- Université Paris-Est, ANSES, Laboratoire de Sécurité des Aliments, Plateforme IdentyPath, 14 Rue Pierre et Marie Curie, 94701 Maisons-Alfort, France
| | - Patrick Fach
- Université Paris-Est, ANSES, Laboratoire de Sécurité des Aliments, Plateforme IdentyPath, 14 Rue Pierre et Marie Curie, 94701 Maisons-Alfort, France
| | - Lothar Beutin
- National Reference Laboratory for Escherichia coli (Including VTEC), Department of Biological Safety, Federal Institute for Risk Assessment (BfR), D-12277 Berlin, Germany
| | - Delphine Sergentet-Thévenot
- University of Lyon, Research Group on «Bacterial Opportunistic Pathogens and Environment», UMR5557 Microbial Ecology, University Lyon 1, CNRS, VetAgro Sup, 69622 Villeurbanne Cedex, France; University of Lyon, VetAgro Sup, LMAP Laboratory, National Reference Laboratory for Escherichia coli (Including VTEC), Marcy L'Etoile, France
| | - Benoit Cournoyer
- University of Lyon, Research Group on «Bacterial Opportunistic Pathogens and Environment», UMR5557 Microbial Ecology, University Lyon 1, CNRS, VetAgro Sup, 69622 Villeurbanne Cedex, France
| | - Estelle Loukiadis
- University of Lyon, Research Group on «Bacterial Opportunistic Pathogens and Environment», UMR5557 Microbial Ecology, University Lyon 1, CNRS, VetAgro Sup, 69622 Villeurbanne Cedex, France; University of Lyon, VetAgro Sup, LMAP Laboratory, National Reference Laboratory for Escherichia coli (Including VTEC), Marcy L'Etoile, France.
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Douëllou T, Delannoy S, Ganet S, Mariani-Kurkdjian P, Fach P, Loukiadis E, Montel M, Thevenot-Sergentet D. Shiga toxin-producing Escherichia coli strains isolated from dairy products - Genetic diversity and virulence gene profiles. Int J Food Microbiol 2016; 232:52-62. [PMID: 27257743 DOI: 10.1016/j.ijfoodmicro.2016.04.032] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Revised: 04/27/2016] [Accepted: 04/29/2016] [Indexed: 01/01/2023]
Abstract
Shiga toxin-producing Escherichia coli (STEC) are widely recognized as pathogens causing food borne disease. Here we evaluate the genetic diversity of 197 strains, mainly STEC, from serotypes O157:H7, O26:H11, O103:H2, O111:H8 and O145:28 and compared strains recovered in dairy products against strains from human, meat and environment cases. For this purpose, we characterized a set of reference-collection STEC isolates from dairy products by PFGE DNA fingerprinting and a subset of these by virulence-gene profiling. PFGE profiles of restricted STEC total DNA showed high genomic variability (0.9976 on Simpson's discriminatory index), enabling all dairy isolates to be differentiated. High-throughput real-time PCR screening of STEC virulence genes were applied on the O157:H7 and O26:H11 STEC isolates from dairy products and human cases. The virulence gene profiles of dairy and human STEC strains were similar. Nevertheless, frequency-wise, stx1 was more prevalent among dairy O26:H11 isolates than in human cases ones (87% vs. 44%) while stx2 was more prevalent among O26:H11 human isolates (23% vs. 81%). For O157:H7 isolates, stx1 (0% vs. 39%), nleF (40% vs 94%) and Z6065 (40% vs 100%) were more prevalent among human than dairy strains. Our data point to differences between human and dairy strains but these differences were not sufficient to associate PFGE and virulence gene profiles to a putative lower pathogenicity of dairy strains based on their lower incidence in disease. Further comparison of whole-genome expression and virulence gene profiles should be investigated in cheese and intestinal tract samples.
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Affiliation(s)
- T Douëllou
- INRA UR Fromagères 545, 20 Cote de Reyne, 15000 Aurillac, France; Université de Lyon, "Bacterial Opportunistic Pathogens and Environment" Research Group, UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, 69280 Marcy l'Etoile, France
| | - S Delannoy
- Université Paris-Est, ANSES, Laboratoire de Sécurité des Aliments, Plateforme IdentyPath, 14 rue Pierre et Marie Curie, 94701 Maisons-Alfort, France
| | - S Ganet
- Université de Lyon, "Bacterial Opportunistic Pathogens and Environment" Research Group, UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, 69280 Marcy l'Etoile, France; Université de Lyon, VetAgro Sup Campus Vétérinaire, Laboratoire d'études des Microorganismes Alimentaires Pathogènes, French National Reference Laboratory for Escherichia coli including Shiga-like toxin-producing E. coli (NRL-STEC), 69280 Marcy-l'Etoile, France
| | - P Mariani-Kurkdjian
- Centre National de Référence Associé des Escherichia coli, AP-HP, Service de Microbiologie, Hôpital Robert-Debré, 75019 Paris, France
| | - P Fach
- Université Paris-Est, ANSES, Laboratoire de Sécurité des Aliments, Plateforme IdentyPath, 14 rue Pierre et Marie Curie, 94701 Maisons-Alfort, France
| | - E Loukiadis
- Université de Lyon, "Bacterial Opportunistic Pathogens and Environment" Research Group, UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, 69280 Marcy l'Etoile, France; Université de Lyon, VetAgro Sup Campus Vétérinaire, Laboratoire d'études des Microorganismes Alimentaires Pathogènes, French National Reference Laboratory for Escherichia coli including Shiga-like toxin-producing E. coli (NRL-STEC), 69280 Marcy-l'Etoile, France
| | - Mc Montel
- INRA UR Fromagères 545, 20 Cote de Reyne, 15000 Aurillac, France
| | - D Thevenot-Sergentet
- Université de Lyon, "Bacterial Opportunistic Pathogens and Environment" Research Group, UMR5557 Ecologie Microbienne Lyon, Université Lyon 1, CNRS, VetAgro Sup, 69280 Marcy l'Etoile, France; Université de Lyon, VetAgro Sup Campus Vétérinaire, Laboratoire d'études des Microorganismes Alimentaires Pathogènes, French National Reference Laboratory for Escherichia coli including Shiga-like toxin-producing E. coli (NRL-STEC), 69280 Marcy-l'Etoile, France.
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