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McCarthy SC, Macori G, Burgess CM, Duffy G, Fanning S. Hybrid genome assemblies of four Shiga toxin-producing Escherichia coli strains containing a complete locus of enterocyte effacement and an O-Island 122. Microbiol Resour Announc 2023; 12:e0004623. [PMID: 37905991 PMCID: PMC10652964 DOI: 10.1128/mra.00046-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 09/29/2023] [Indexed: 11/02/2023] Open
Abstract
This study describes the hybrid genome assemblies of four Shiga toxin-producing Escherichia coli strains isolated from the recto-anal junction of slaughter-age Irish sheep. In silico serotyping and genome analysis determined that each of the strains harbored a Shiga-toxin subtype, a complete locus of enterocyte effacement, and a rare O-island 122.
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Affiliation(s)
- Siobhán C. McCarthy
- UCD-Center for Food Safety, School of Health, Physiotherapy and Sports Science, University College Dublin, Belfield, Dublin, Ireland
- Food Safety Department, Teagasc Food Research Center, Ashtown, Dublin, Ireland
| | - Guerrino Macori
- UCD-Center for Food Safety, School of Health, Physiotherapy and Sports Science, University College Dublin, Belfield, Dublin, Ireland
- School of Biology and Environmental Science, University College Dublin, Dublin, Ireland
| | | | - Geraldine Duffy
- Food Safety Department, Teagasc Food Research Center, Ashtown, Dublin, Ireland
| | - Séamus Fanning
- UCD-Center for Food Safety, School of Health, Physiotherapy and Sports Science, University College Dublin, Belfield, Dublin, Ireland
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Li K, Xu L, Tian M, Yang M, Jia L, Zou D, Liu R, Du J, Ma Y. The pathogenic potential and genetic attributes of Escherichia coli in milk from dairy cows with subclinical mastitis. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2022; 57:876-882. [PMID: 36193664 DOI: 10.1080/03601234.2022.2129239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The centrality of milk and dairy products to the human diet allows potential pathogens to pose a threat to human health. Pathogenic Escherichia coli is a zoonotic foodborne pathogen with many virulence genes which cause variations in its pathogenicity. The current study aimed to investigate the pathogenic potential of E. coli from milk of dairy cows with subclinical mastitis and evaluate the genetic relatedness to E. coli from human sources. The majority of the E. coli isolates belonged to the A (55.0%) and B2 (22.5%) phylogenetic groups and the most prevalent virulence genes were colV (90.0%), fyuA (75.0%) and vat (42.5%). Mice injected with G4-BD23 (P < 0.05) and G5-BD3 had lower survival rates than controls and visible pathological changes to lung and kidney. Nineteen MLST types were identified in 40 dairy E. coli isolates and three STs (ST10, ST48 and ST942) were shared with those from human sources. Some dairy E. coli isolates were phylogenetically related to human E. coli isolates indicating pathogenic potential.
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Affiliation(s)
- Ke Li
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Lina Xu
- College of Life Science and Food Engineering, Hebei University of Engineering, Handan, China
| | - Mengyue Tian
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Ming Yang
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Li Jia
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Dongmin Zou
- College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong, China
| | - Ruonan Liu
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Jinliang Du
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi, China
| | - Yuzhong Ma
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
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Bording-Jorgensen M, Tyrrell H, Lloyd C, Chui L. Comparison of Common Enrichment Broths Used in Diagnostic Laboratories for Shiga Toxin-Producing Escherichia coli. Microorganisms 2021; 9:microorganisms9030503. [PMID: 33673617 PMCID: PMC7997271 DOI: 10.3390/microorganisms9030503] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/11/2021] [Accepted: 02/25/2021] [Indexed: 01/04/2023] Open
Abstract
Acute gastroenteritis caused by Shiga toxin-producing Escherichia coli (STEC) affects more than 4 million individuals in Canada. Diagnostic laboratories are shifting towards culture-independent diagnostic testing; however, recovery of STEC remains an important aspect of surveillance programs. The objective of this study was to compare common broth media used for the enrichment of STEC. Clinical isolates including O157:H7 as well as non-O157 serotypes were cultured in tryptic soy (TSB), MacConkey (Mac), and Gram-negative (GN) broths and growth was compared using culture on sheep’s blood agar and real-time PCR (qPCR). In addition, a selection of the same isolates was spiked into negative stool and enriched in the same three broths, which were then evaluated using culture on CHROMagarTM STEC agar and qPCR. TSB was found to provide the optimal enrichment for growth of isolates with and without stool. The results from this study suggest that diagnostic laboratories may benefit from enriching STEC samples in TSB as a first line enrichment instead of GN or Mac.
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Affiliation(s)
- Michael Bording-Jorgensen
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB T6G 2R3, Canada; (M.B.-J.); (H.T.); (C.L.)
| | - Hannah Tyrrell
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB T6G 2R3, Canada; (M.B.-J.); (H.T.); (C.L.)
| | - Colin Lloyd
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB T6G 2R3, Canada; (M.B.-J.); (H.T.); (C.L.)
| | - Linda Chui
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB T6G 2R3, Canada; (M.B.-J.); (H.T.); (C.L.)
- Alberta Precision Laboratories-Public Health Laboratory (ProvLab), Edmonton, AB T6G 2J2, Canada
- Correspondence: ; Tel.: +(780)407-8951
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Cadona JS, Burgán J, González J, Bustamante AV, Sanso AM. Differential expression of the virulence gene nleB among Shiga toxin-producing Escherichia coli strains. Heliyon 2020; 6:e04277. [PMID: 32613131 PMCID: PMC7322132 DOI: 10.1016/j.heliyon.2020.e04277] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/08/2020] [Accepted: 06/18/2020] [Indexed: 11/22/2022] Open
Abstract
Shiga toxin-producing Escherichia coli (STEC) is a zoonotic foodborne pathogen associated with hemolytic uremic syndrome (HUS) that vary in their ability to cause disease in humans. STEC represents a serious problem for public health and Argentina is the country with the highest HUS incidence worldwide. Non-LEE effector (nle) genes, present on pathogenicity islands (PAIs), encode translocated substrates of the type III secretion system (T3SS), which could have an important role in STEC virulence. Particularly, nleB is one of the main effector genes proposed as a virulence marker that is involved in the action of T3SS during the STEC infection. NleB inhibits the inflammatory response of the host cell allowing the bacteria to persist in the first stage of the infection. In order to identify the potential risk of STEC strains for public health, the aim of this study was to evaluate and compare basal nleB transcription of 24 STEC strains belonging to 10 serotypes isolated from cattle, food and patients. The results showed differences in nleB transcription among strains. Some non-O157:H7 strains presented transcription levels above the control, an O157:H7 HUS-producing strain. On the other hand, no significant differences were found in basal transcription levels associated with origin or serotype but differences were found between HUS and non-HUS strains. These differences in nleB transcription may be of importance in STEC pathogenesis and could help to differentiate high and low virulence STEC strains.
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Wieczorek K, Osek J. Identification and molecular characteristics of verotoxin-producing Escherichia coli (VTEC) from bovine and pig carcasses isolated in Poland during 2014-2018. Food Microbiol 2020; 92:103587. [PMID: 32950170 DOI: 10.1016/j.fm.2020.103587] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/04/2020] [Accepted: 06/24/2020] [Indexed: 11/16/2022]
Abstract
The presence of verotoxin-producing Escherichia coli (VTEC) on bovine (n = 330) and pig (n = 120) carcasses in Poland was investigated using the ISO/TS 13136 standard. A total of 115 (34.8%) and 37 (30.8%) cattle and pig samples were positive in real-time PCR, respectively. Isolation of the bacteria revealed that from bovine carcasses 37 (32.2%) VTEC were obtained whereas only 5 (13.5%) pig carcasses were positive for the stx gene. The VTEC were characterized using whole genome sequencing (WGS) and bovine isolates were classified into 25 serotypes with the most prevalent O113:H21 (5 strains) whereas pig strains belonged to 5 different serotypes which were not identified among cattle strains. The majority of bovine VTEC (35; 94.6% isolates) were positive for the stx2 gene, either alone or together with the stx1 gene. All strains isolated from pig carcasses resulted positive for the stx2 gene only. Only two isolates of bovine origin contained the eaeA intimin gene, together with the ehxA and lpfA markers. VTEC were highly molecularly diverse as shown by classification into 29 different MLST STs. The obtained results suggest that further studies related to cattle and pig carcasses are needed to assess the role of these sources for human VTEC infections.
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Affiliation(s)
- Kinga Wieczorek
- Department of Hygiene of Food of Animal Origin, National Veterinary Research Institute, Partyzantow 57, 24-100, Pulawy, Poland
| | - Jacek Osek
- Department of Hygiene of Food of Animal Origin, National Veterinary Research Institute, Partyzantow 57, 24-100, Pulawy, Poland.
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Hernandez LB, Cadona JS, Christensen M, Fernández D, Padola NL, Bustamante AV, Sanso AM. Virulence genes and genetic diversity assessment of Shiga toxin-producing Escherichia coli O91 strains from cattle, beef and poultry products. Microb Pathog 2018; 125:463-467. [PMID: 30300666 DOI: 10.1016/j.micpath.2018.10.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 10/04/2018] [Accepted: 10/05/2018] [Indexed: 11/16/2022]
Abstract
Shiga toxin-producing Escherichia coli (STEC) O91 has ranked in the top five of the non-O157 serogroups most frequently associated with human cases. In order to gain insight into the genetic diversity of O91 Latin American STEC strains, we analyzed their virulence properties and carried out a subtyping assay. A panel of 21 virulence genetic markers associated with human and animal infections was evaluated and the relatedness among strains was determined by a multiple-locus variable-number tandem repeats analysis (MLVA) comprising 9 VNTR loci. Twenty-two STEC O91 isolated from cattle and meat food and belonging to 5 serotypes (O91:H21, O91:H8, O91:H14, O91:H28, O91:H40) were studied. Eight virulence profiles were obtained for the O91 STEC strains: 4 for O91:H21 plus one for O91:H8, O91:H14, O91:H28 and O91:H40. All strains contained ehxA and lpfA0113 genes and only both stx1-positive strains lacked saa, which encodes the STEC autoagglutinating adhesin. Other genes involved in adhesion were detected: ehaA (91%), elfA and espP (86%), ecpA (82%) and, hcpA (77%). The gene encoding the cytolethal distending toxin type-V (CDT-V) was found only in O91:H8 and O91:H21, being present in the majority (89%) of strains of this last serotype. MLVA typing divided the total number of strains into 12 genotypes, and 9 of them were unique to a single strain. No association was observed between the virulence profiles and the source of the strains. Although they lack the eae gene, most of the strains have the genetic potential to adhere to host cells through other structures and possess cdt-V, which has been found in STEC strains involved in serious diseases. The MLVA showed clonal relatedness among strains isolated from cattle belonged to a same dairy farm and suggested that the same clone remains circulating throughout the year and, on the other hand, the need to increase the number of VNTR loci which could allow a higher discrimination among O91:H21 isolates.
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Affiliation(s)
- Luciana Belén Hernandez
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CIC-UNCPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000, Tandil, Argentina
| | - Jimena Soledad Cadona
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CIC-UNCPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000, Tandil, Argentina
| | - Martín Christensen
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CIC-UNCPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000, Tandil, Argentina
| | - Daniel Fernández
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CIC-UNCPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000, Tandil, Argentina
| | - Nora Lía Padola
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CIC-UNCPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000, Tandil, Argentina
| | - Ana Victoria Bustamante
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CIC-UNCPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000, Tandil, Argentina
| | - Andrea Mariel Sanso
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CIC-UNCPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, 7000, Tandil, Argentina.
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Torres AG, Amaral MM, Bentancor L, Galli L, Goldstein J, Krüger A, Rojas-Lopez M. Recent Advances in Shiga Toxin-Producing Escherichia coli Research in Latin America. Microorganisms 2018; 6:microorganisms6040100. [PMID: 30274180 PMCID: PMC6313304 DOI: 10.3390/microorganisms6040100] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 09/01/2018] [Accepted: 09/28/2018] [Indexed: 12/12/2022] Open
Abstract
Pathogenic Escherichia coli are known to be a common cause of diarrheal disease and a frequently occurring bacterial infection in children and adults in Latin America. Despite the effort to combat diarrheal infections, the south of the American continent remains a hot spot for infections and sequelae associated with the acquisition of one category of pathogenic E. coli, the Shiga toxin-producing E. coli (STEC). This review will focus on an overview of the prevalence of different STEC serotypes in human, animals and food products, focusing on recent reports from Latin America outlining the recent research progress achieved in this region to combat disease and endemicity in affected countries and to improve understanding on emerging serotypes and their virulence factors. Furthermore, this review will highlight the progress done in vaccine development and treatment and will also discuss the effort of the Latin American investigators to respond to the thread of STEC infections by establishing a multidisciplinary network of experts that are addressing STEC-associated animal, human and environmental health issues, while trying to reduce human disease. Regardless of the significant scientific contributions to understand and combat STEC infections worldwide, many significant challenges still exist and this review has focus in the Latin American efforts as an example of what can be accomplished when multiple groups have a common goal.
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Affiliation(s)
- Alfredo G Torres
- Department of Microbiology and Immunology, Sealy Institute for Vaccine Sciences, University of Texas Medical Branch, Galveston, TX 77555, USA.
| | - Maria M Amaral
- Laboratorio de Fisiopatogenia, Departamento de Fisiología, Instituto de Fisiología y Biofísica Bernardo Houssay, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires C1121ABG, Argentina.
| | - Leticia Bentancor
- Laboratory of Genetic Engineering and Molecular Biology, Institute of Basic and Applied Microbiology, National University of Quilmes, Bernal, Buenos Aires 1876, Argentina.
| | - Lucia Galli
- Instituto de Genética Veterinaria Ing. Fernando N. Dulout (UNLP-CONICET, La Plata), Facultad de Ciencias Veterinarias, La Plata 1900, Argentina.
| | - Jorge Goldstein
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Fisiología y Biofísica Houssay, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires C1121ABG, Argentina.
| | - Alejandra Krüger
- Centro de Investigación Veterinaria de Tandil (CONICET-CIC-UNCPBA), Facultad de Ciencias Veterinarias, Tandil 7000, Argentina.
| | - Maricarmen Rojas-Lopez
- Department of Medicine, Division of Infectious Diseases, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02115, USA.
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Erratum: Jimena Soledad Cadona, et al.; Pathogenicity Islands Distribution in Non-O157 Shiga Toxin-Producing Escherichia coli (STEC). Genes 2018, 9, 81. Genes (Basel) 2018; 9:genes9040222. [PMID: 29677096 PMCID: PMC5924564 DOI: 10.3390/genes9040222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 03/26/2018] [Accepted: 04/04/2018] [Indexed: 12/04/2022] Open
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