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Vélez MV, Colello R, Nieto MV, Paz LE, Etcheverría AI, Vidal R, Padola NL. Transcription levels of hes and their involvement in the biofilm formation of Shiga toxin-producing Escherichia coli O91. Vet Res Commun 2024:10.1007/s11259-024-10308-0. [PMID: 38263503 DOI: 10.1007/s11259-024-10308-0] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 01/10/2024] [Indexed: 01/25/2024]
Abstract
Shiga toxin-producing Escherichia coli (STEC) are recognized as being responsible for many cases of foodborne diseases worldwide. Cattle are the main reservoir of STEC, shedding the microorganisms in their feces. The serogroup STEC O91 has been associated with hemorrhagic colitis and hemolytic uremic syndrome. Locus of Adhesion and Autoaggregation (LAA) and its hes gene are related to the pathogenicity of STEC and the ability to form biofilms. Considering the frequent isolation of STEC O91, the biofilm-forming ability, and the possible role of hes in the pathogenicity of STEC, we propose to evaluate the ability of STEC to form biofilms and to evaluate the expression of hes before and after of biofilm formation. All strains were classified as strong biofilm-forming. The hes expression showed variability between strains before and after biofilm formation, and this may be due to other genes carried by each strain. This study is the first to report the relationship between biofilm formation, and hes expression and proposes that the analysis and diagnosis of LAA, especially hes as STEC O91 virulence factors, could elucidate these unknown mechanisms. Considering that there is no specific treatment for HUS, only supportive care, it is necessary to know the survival and virulence mechanisms of STEC O91.
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Affiliation(s)
- María Victoria Vélez
- Facultad de Cs. Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA-CICPBA-CONICET, Tandil, Buenos Aires, Argentina
| | - Rocío Colello
- Facultad de Cs. Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA-CICPBA-CONICET, Tandil, Buenos Aires, Argentina
| | - María Victoria Nieto
- Facultad de Cs. Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA-CICPBA-CONICET, Tandil, Buenos Aires, Argentina
| | - Laura Estefanía Paz
- Facultad de Cs. Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), SAMP, Tandil, Buenos Aires, Argentina
- Instituto Multidisciplinario sobre Ecosistemas y Desarrollo Sustentable, CONICET, Tandil, Buenos Aires, Argentina
| | - Analía Inés Etcheverría
- Facultad de Cs. Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA-CICPBA-CONICET, Tandil, Buenos Aires, Argentina
| | - Roberto Vidal
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Nora Lía Padola
- Facultad de Cs. Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, Argentina.
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA-CICPBA-CONICET, Tandil, Buenos Aires, Argentina.
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Ruiz MJ, García MD, Canalejo LMM, Krüger A, Padola NL, Etcheverría AI. Antimicrobial activity of Lactiplantibacillus plantarum against shiga toxin-producing Escherichia coli. J Appl Microbiol 2023; 134:lxad202. [PMID: 37660235 DOI: 10.1093/jambio/lxad202] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 08/15/2023] [Accepted: 08/31/2023] [Indexed: 09/04/2023]
Abstract
AIMS The aim of the present work was to characterize the Lactiplantibacillus sp. LP5 strain, isolated from pork production, and identify bacteriocin-like inhibitory substances produced by this strain. METHODS AND RESULTS In this study, LP5 was identified by species-specific PCR and 16S rRNA sequencing. Additionally, bacterial growth kinetics, antimicrobial activity, the detection of genes related to plantaricin production, and the genetic expression of plantaricins were determined. Lactiplantibacillus sp. LP5 was identified as Lactiplantibacillus plantarum. The well-diffusion test using cell-free supernatants (CFS), neutralized CFS, CFS treated with catalase, and CFS treated with proteinase K showed that inhibitory effects on a Shiga toxin-producing Escherichia coli (STEC) strain were produced by bacteriocins. The PCR technique allowed the detection of genes encoding E/F plantaricins, as well as J/K and whole genome sequencing, and bacteriocin mining analysis allowed us to confirm the presence of these plantaricins. CONCLUSIONS We can conclude that the inhibitory effect of L. plantarum LP5 isolated from pigs against the STEC EDL933 strain could be associated with the bacteriocins production and represents a potential use as a probiotic strain.
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Affiliation(s)
- María Julia Ruiz
- Department of Animal Health and Preventive Medicine, Veterinary Research Centre (CIVETAN), CONICET-CICPBA, Faculty of Veterinary Sciences, National University of the Centre of the Province of Buenos Aires, Tandil CP7000, Buenos Aires, Argentina
| | - Mauro Daniel García
- Department of Animal Health and Preventive Medicine, Veterinary Research Centre (CIVETAN), CONICET-CICPBA, Faculty of Veterinary Sciences, National University of the Centre of the Province of Buenos Aires, Tandil CP7000, Buenos Aires, Argentina
| | - Luis Manuel Medina Canalejo
- Food Science and Technology Department, International Agrifood Campus of Excellence, Charles Darwin Annex Building, Campus de Rabanales, University of Córdoba, Cordoba, Spain
| | - Alejandra Krüger
- Department of Animal Health and Preventive Medicine, Veterinary Research Centre (CIVETAN), CONICET-CICPBA, Faculty of Veterinary Sciences, National University of the Centre of the Province of Buenos Aires, Tandil CP7000, Buenos Aires, Argentina
| | - Nora Lía Padola
- Department of Animal Health and Preventive Medicine, Veterinary Research Centre (CIVETAN), CONICET-CICPBA, Faculty of Veterinary Sciences, National University of the Centre of the Province of Buenos Aires, Tandil CP7000, Buenos Aires, Argentina
| | - Analía Inés Etcheverría
- Department of Animal Health and Preventive Medicine, Veterinary Research Centre (CIVETAN), CONICET-CICPBA, Faculty of Veterinary Sciences, National University of the Centre of the Province of Buenos Aires, Tandil CP7000, Buenos Aires, Argentina
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Colello R, Vélez MV, Farias MVN, Rodríguez M, Montero D, Vidal R, Etcheverría AI, Padola NL. Expression of hes, iha, and tpsA codified in locus of adhesion and autoaggregation and their involvement in the capability of shiga toxin-producing Escherichia coli strains to adhere to epithelial cells. BMC Res Notes 2023; 16:163. [PMID: 37550739 PMCID: PMC10408066 DOI: 10.1186/s13104-023-06433-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 07/17/2023] [Indexed: 08/09/2023] Open
Abstract
OBJECTIVES Shiga toxin-producing Escherichia coli strains LAA-positive are important cause of human infection. The capability to adhere to epithelial cells is a key virulence trait, and genes codified in LAA pathogenicity island could be involved in the adhesion during the pathogenesis of LAA-positive STEC strains. Thus, our objectives were to compare hes-negative and hes-positive STEC strains in their adherence capability to epithelial cells (HEp-2) and to evaluate the expression levels of the hes, iha, and tpsA in the bacteria adhered and non-adhered to HEp-2 cells. These genes are encoded in LAA, and are virulence factors that participate in adhesion and autoaggregation. RESULTS We could not observe differences between the adhesion of strains but also in the expression level of of hes, iha, and tpsA. Genes encoded in LAA contribute to the adhesion phenotype though the expression of STEC adhesins is a coordinated event that depends not only the strain but also on the environment as well as its genetic background. Therefore, the results of this study suggest that LAA ,the most prevalent PAI among LEE-negative STEC strains, plays a role in pathogenesis.
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Affiliation(s)
- Rocío Colello
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, 7000, Argentina.
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, 7000, Argentina.
| | - M Victoria Vélez
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, 7000, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, 7000, Argentina
| | - M Victoria Nieto Farias
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, 7000, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, 7000, Argentina
| | - Marcelo Rodríguez
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), SAMP, Tandil, Buenos Aires, 7000, Argentina
| | - David Montero
- Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, 4030555, Chile
- Centro Integrativo de Biología y Química Aplicada (CIBQA), Universidad Bernardo O'Higgins, Santiago, 8320000, Chile
| | - Roberto Vidal
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, 8320000, Chile
| | - Analía I Etcheverría
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, 7000, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, 7000, Argentina
| | - Nora Lía Padola
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), CISAPA, Tandil, Buenos Aires, 7000, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, 7000, Argentina
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Colello R, Baigorri M, Del Canto F, González J, Rogé A, van der Ploeg C, Sánchez Chopa F, Sparo M, Etcheverría A, Padola NL. Occurrence and genetic characterization of Shiga toxin-producing Escherichia coli on bovine and pork carcasses and the environment from transport trucks. World J Microbiol Biotechnol 2023; 39:174. [PMID: 37115263 DOI: 10.1007/s11274-023-03624-1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 04/17/2023] [Indexed: 04/29/2023]
Abstract
Shiga toxin-producing Escherichia coli (STEC) are foodborne pathogens causing severe diseases. The ability of STEC to produce disease is associated with Shiga toxin (Stx) production. We investigated the occurrence of STEC on bovine and pork carcasses and walls of trucks where they were transported, and we characterized virulence genes and serotypes of STEC strains. We compared the whole genomic sequencing of a STEC O157:H7 strain isolated from a bovine carcass in this work and a STEC O157:H7 strain isolated from a child with HUS, both isolated in 2019. We studied the relationship between these isolates and others collected in the database. The results show a 40% of STEC and two different serogroups were identified (O130 and O157). STEC O157:H7 were isolated from bovine carcasses and harbored stx2, eae, ehxA, katP, espP, stcE, ECSP_0242/1773/2687/2870/2872/3286/3620 and were classified as lineage I/II. In STEC non-O157 isolates, three isolates were isolated from bovine carcasses and harbored the serogroup O130 and one strain isolated from pork carcasses was O-non-typeable. All STEC non-O157 harbored sxt1 gene. The analysis from the whole genome showed that both STEC O157:H7 strains belonged to the hypervirulent clade 8, ST11, phylogroup E, carried the allele tir 255 T > A T, and they were not clonal. The analysis of information allows us to conclude that the STEC strains circulate in pork and bovine carcasses arriving in transport. This situation represents a risk for the consumers and the need to implement an integrated STEC control in the food chain.
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Affiliation(s)
- Rocío Colello
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Tandil, Buenos Aires, Argentina.
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, Buenos Aires, Argentina.
| | - Manuela Baigorri
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Tandil, Buenos Aires, Argentina
| | - Felipe Del Canto
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Juliana González
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Tandil, Buenos Aires, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, Buenos Aires, Argentina
| | - Ariel Rogé
- Servicio Antígenos y Antisueros, Instituto Nacional de Producción de Biológicos, Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán", Buenos Aires, Argentina
| | - Claudia van der Ploeg
- Servicio Antígenos y Antisueros, Instituto Nacional de Producción de Biológicos, Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán", Buenos Aires, Argentina
| | - Federico Sánchez Chopa
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Tandil, Buenos Aires, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, Buenos Aires, Argentina
| | - Mónica Sparo
- Laboratorio de Microbiología Clínica, Hospital Ramón Santamarina, Tandil, Buenos Aires, Argentina
| | - Analía Etcheverría
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Tandil, Buenos Aires, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, Buenos Aires, Argentina
| | - Nora Lía Padola
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Tandil, Buenos Aires, Argentina
- Centro de Investigación Veterinaria de Tandil (CIVETAN), UNCPBA- CICPBA- CONICET, Tandil, Buenos Aires, Argentina
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Vélez MV, Colello R, Etcheverría AI, Padola NL. [Shiga toxin producing Escherichia coli: the challenge of adherence to survive]. Rev Argent Microbiol 2023; 55:100-107. [PMID: 35676186 DOI: 10.1016/j.ram.2022.04.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 06/07/2021] [Revised: 11/05/2021] [Accepted: 04/19/2022] [Indexed: 10/18/2022] Open
Abstract
Shiga Toxin-producing Escherichia coli (STEC) is recognized as being responsible for a large number of foodborne illnesses around the world. The pathogenicity of STEC has been related to Stx toxins. However, the ability of STEC to colonize the host and other surfaces can be essential for developing its pathogenicity. Different virulence profiles detected in STEC could cause the emergence of strains carrying new genes codified in new pathogenicity islands linked to metabolism and adherence. Biofilm formation is a spontaneous mechanism whereby STEC strains resist in a hostile environment being able to survive and consequently infect the host through contaminated food and food contact surfaces. Biofilm formation shows intra-and inter-serotype variability, and its formation does not depend only on the microorganisms involved. Other factors related to the environment (such as pH, temperature) and the surface (stainless steel and polystyrene) influence biofilm expression. The «One Health» concept implies the interrelation between public, animal, and environmental health actors to ensure food safety, prevent cross-contamination and resistance to sanitizers, highlighting the need to identify emerging pathogens through new molecular markers of rapid detection that involve STEC strains carrying the Locus of Enterocyte Effacement or Locus of Adhesion and Autoaggregation.
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Affiliation(s)
- M V Vélez
- Laboratorio de Inmunoquímica y Biotecnología, Facultad de Ciencias Veterinarias, CIVETAN-CONICET-CIC-UNCPBA, Tandil, Argentina
| | - R Colello
- Laboratorio de Inmunoquímica y Biotecnología, Facultad de Ciencias Veterinarias, CIVETAN-CONICET-CIC-UNCPBA, Tandil, Argentina
| | - A I Etcheverría
- Laboratorio de Inmunoquímica y Biotecnología, Facultad de Ciencias Veterinarias, CIVETAN-CONICET-CIC-UNCPBA, Tandil, Argentina
| | - N L Padola
- Laboratorio de Inmunoquímica y Biotecnología, Facultad de Ciencias Veterinarias, CIVETAN-CONICET-CIC-UNCPBA, Tandil, Argentina.
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Gonzalez J, Cadona JS, Zotta CM, Lavayén S, Vidal R, Padola NL, Sanso AM, Bustamante AV. Genetic features of verotoxigenic Escherichia coli O157:H7 isolated from clinical cases of Argentina and Chile. Microbes Infect 2021; 24:104883. [PMID: 34474180 DOI: 10.1016/j.micinf.2021.104883] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 05/19/2021] [Revised: 08/13/2021] [Accepted: 08/22/2021] [Indexed: 12/17/2022]
Abstract
We aimed to compare the genetic diversity existing in VTEC O157:H7 strains isolated from cases of human disease from Argentina and Chile. For it, 76 strains were studied in relation to the distribution of genes encoding virulence factors and subtyped by lineage-specific polymorphisms (LSPA-6), and phylogroups assignment. Our results show the almost exclusive circulation of VTEC O157:H7 isolates belonging to lineage I/II, associated with hypervirulent strains, and to the phylogroup E and, on the other hand, genetic diversity present among Argentinean and Chilean strains analyzed, mainly in relation to putative virulence determinants and nle profiles.
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Affiliation(s)
- Juliana Gonzalez
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET, Facultad de Ciencias Veterinarias, UNCPBA, Tandil, Buenos Aires, Argentina.
| | - Jimena Soledad Cadona
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET, Facultad de Ciencias Veterinarias, UNCPBA, Tandil, Buenos Aires, Argentina
| | - Claudio Marcelo Zotta
- Servicio Bacteriología, Departamento Laboratorio del Instituto Nacional de Epidemiología "Dr. Juan H. Jara" (INE) -Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán" (ANLIS)- Ministerio de Salud de la Nación Argentina
| | - Silvina Lavayén
- Servicio Bacteriología, Departamento Laboratorio del Instituto Nacional de Epidemiología "Dr. Juan H. Jara" (INE) -Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán" (ANLIS)- Ministerio de Salud de la Nación Argentina
| | - Roberto Vidal
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Nora Lía Padola
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET, Facultad de Ciencias Veterinarias, UNCPBA, Tandil, Buenos Aires, Argentina
| | - Andrea Mariel Sanso
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET, Facultad de Ciencias Veterinarias, UNCPBA, Tandil, Buenos Aires, Argentina
| | - Ana Victoria Bustamante
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET, Facultad de Ciencias Veterinarias, UNCPBA, Tandil, Buenos Aires, Argentina
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Vélez MV, Colello R, Etcheverría AI, Vidal RM, Montero DA, Acuña P, Guillén Fretes RM, Toro M, Padola NL. Distribution of Locus of Adhesion and Autoaggregation and hes Gene in STEC Strains from Countries of Latin America. Curr Microbiol 2020; 77:2111-2117. [DOI: 10.1007/s00284-020-02062-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 05/27/2020] [Indexed: 02/07/2023]
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Colello R, Ruiz MJ, Padín VM, Rogé AD, Leotta G, Padola NL, Etcheverría AI. Detection and Characterization of Salmonella Serotypes in the Production Chain of Two Pig Farms in Buenos Aires Province, Argentina. Front Microbiol 2018; 9:1370. [PMID: 30002649 PMCID: PMC6031755 DOI: 10.3389/fmicb.2018.01370] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [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: 03/20/2018] [Accepted: 06/06/2018] [Indexed: 01/31/2023] Open
Abstract
The aim of the present study was to determine the prevalence of Salmonella in the pork production chain and to characterize Salmonella isolates. From 764 samples, 35 (4.6%) were positive for Salmonella spp., as determined by biochemical tests and the presence of the invA gene. From these, 2.6, 2.0, 8.8, and 8.0% corresponded to samples collected from farms, slaughterhouses, boning rooms and retail markets, respectively. Salmonella strains were classified into five serotypes and distributed as follows: S. Typhimurium in the pork production chain, S. Kentucky in farms and slaughterhouses, S. Brandenburg in slaughterhouses, S. Livingstone in farms and S. Agona in boning rooms and retail markets. Interestingly, the antimicrobial susceptibility testing indicated that all 35 Salmonella spp.-positive isolates were resistant to at least one antimicrobial agent, and 30 were multidrug-resistant (MDR) and resistant to different classes of antibiotics. The enterobacterial repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR) analysis showed clonal relatedness among strains isolated from farms, boning rooms and retail markets. The presence of antibiotic-resistant Salmonella in food poses a potential health hazard to consumers.
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Affiliation(s)
- Rocío Colello
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CICPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
| | - María J Ruiz
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CICPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
| | - Valeria M Padín
- Servicio Antígenos y Antisueros, Instituto Nacional de Producción de Biológicos, Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán", Buenos Aires, Argentina
| | - Ariel D Rogé
- Servicio Antígenos y Antisueros, Instituto Nacional de Producción de Biológicos, Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán", Buenos Aires, Argentina
| | - Gerardo Leotta
- Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout" (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Buenos Aires, Argentina
| | - Nora Lía Padola
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CICPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
| | - Analía I Etcheverría
- Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CICPBA, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
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Umpiérrez A, Bado I, Oliver M, Acquistapace S, Etcheverría A, Padola NL, Vignoli R, Zunino P. Zoonotic Potential and Antibiotic Resistance of Escherichia coli in Neonatal Calves in Uruguay. Microbes Environ 2017; 32:275-282. [PMID: 28904264 PMCID: PMC5606698 DOI: 10.1264/jsme2.me17046] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [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] [Indexed: 11/12/2022] Open
Abstract
Escherichia coli is one of the main etiological agents of neonatal calf diarrhea (NCD). The objective of this study was to assess the presence of virulence genes, genetic diversity, and antibiotic resistance mechanisms in E. coli associated with NCD in Uruguay. PCR was used to assess the presence of intimin, Shiga-like toxin, and stable and labile enterotoxin genes. Resistance to fluoroquinolones and oxyimino-cephalosporins was estimated on Müller-Hinton agar plates. Further antibiotic disc-diffusion tests were performed to assess bacterial multi-resistance. The presence of PMQR, ESBL, MCR-1, and integron genes was evaluated. Isolates were typed using ERIC-PCR, and 20 were selected for MLST, adhesion to Hep-2 cells, in vitro biofilm formation, and eukaryotic cytotoxicity. The prevalence of ETEC genes was lower than 3% in each case (estA and elt). Six isolates were EPEC (eae+) and 2 were EHEC/STEC (eae+/stx1+). The results of a diversity analysis showed high genetic heterogenicity among isolates. Additionally, different sequence types, including ST10, ST21, and ST69, were assigned to selected isolates. Thirty-six percent (96/264) of the isolates were fluoroquinolone-resistant, with 61/96 (63.5%) being multidrug-resistant. Additionally, 6 were oxyimino-cephalosporin-resistant. The qnrB, qnrS1, and blaCTX-M-14 genes were detected, whereas no isolates carried the mcr-1 gene. Isolates had the ability to adhere to Hep-2 cells and form biofilms. Only 1 isolate expressed toxins in vitro. E. coli from NCD cases in Uruguay are very diverse, potentially virulent, and may interact with eukaryotic cells. Zoonotic potential, together with resistance traits and the presence of horizontal transfer mechanisms, may play a significant role in infections caused by these microorganisms.
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Affiliation(s)
- Ana Umpiérrez
- Departamento de Microbiología, Instituto de Investigaciones Biológicas Clemente Estable
| | - Inés Bado
- Departamento de Bacteriología y Virología, Instituto de Higiene, Facultad de Medicina, Universidad de la República
| | - Martín Oliver
- Departamento de Microbiología, Instituto de Investigaciones Biológicas Clemente Estable
| | - Sofía Acquistapace
- Departamento de Microbiología, Instituto de Investigaciones Biológicas Clemente Estable
| | - Analía Etcheverría
- Laboratorio de Inmunoquímica y Biotecnología, CIVETAN-Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires
| | - Nora Lía Padola
- Laboratorio de Inmunoquímica y Biotecnología, CIVETAN-Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires
| | - Rafael Vignoli
- Departamento de Bacteriología y Virología, Instituto de Higiene, Facultad de Medicina, Universidad de la República
| | - Pablo Zunino
- Departamento de Microbiología, Instituto de Investigaciones Biológicas Clemente Estable
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Brusa V, Restovich V, Galli L, Teitelbaum D, Signorini M, Brasesco H, Londero A, García D, Padola NL, Superno V, Sanz M, Petroli S, Costa M, Bruzzone M, Sucari A, Ferreghini M, Linares L, Suberbie G, Rodríguez R, Leotta GA. Isolation and characterization of non-O157 Shiga toxin-producing Escherichia coli from beef carcasses, cuts and trimmings of abattoirs in Argentina. PLoS One 2017; 12:e0183248. [PMID: 28829794 PMCID: PMC5568767 DOI: 10.1371/journal.pone.0183248] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 08/01/2017] [Indexed: 11/18/2022] Open
Abstract
Several foods contaminated with Shiga toxin-producing Escherichia coli (STEC) are associated with human diseases. Some countries have established microbiological criteria for non-O157 STEC, thus, the absence of serogroups O26, O45, O103, O104, O111, O121, and O145 in sprouts from the European Union or ground beef and beef trimmings from the United States is mandatory. While in Argentina screening for O26, O103, O111, O145 and O121 in ground beef, ready-to-eat food, sausages and vegetables is mandatory, other countries have zero-tolerance for all STEC in chilled beef. The aim of this study was to provide data on the prevalence of non-O157 STEC isolated from beef processed in eight Argentinean cattle slaughterhouses producing beef for export and local markets, and to know the non-O157 STEC profiles through strain characterization and genotypic analysis. Samples (n = 15,965) from 3,205 beef carcasses, 9,570 cuts and 3,190 trimmings collected between March and September 2014 were processed in pools of five samples each. Pools of samples (n = 3,193) from 641 carcasses, 1,914 cuts and 638 trimming were analyzed for non-O157 STEC isolation according to ISO/CEN 13136:2012. Of these, 37 pools of carcasses (5.8%), 111 pools of cuts (5.8%) and 45 pools of trimmings (7.0%) were positive for non-O157 STEC. STEC strains (n = 200) were isolated from 193 pools of samples. The most prevalent serotypes were O174:H21, O185:H7, O8:H19, O178:H19 and O130:H11, and the most prevalent genotypes were stx2c(vh-b) and stx2a/saa/ehxA. O103:H21 strain was eae-positive and one O178:H19 strain was aggR/aaiC-positive. The prevalence of non-O157 STEC in beef carcasses reported here was low. None of the non-O157 STEC strains isolated corresponded to the non-O157 STEC serotypes and virulence profiles isolated from human cases in Argentina in the same study period. The application of microbiological criteria for each foodstuff should be determined by risk analysis in order to have a stringent monitoring system. Likewise, zero-tolerance intervention measures should be applied in beef, together with GMP and HACCP. Further, collaborative efforts for risk assessment, management and communication are extremely important to improve the safety of foodstuffs.
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Affiliation(s)
- Victoria Brusa
- IGEVET—Instituto de Genética Veterinaria “Ing. Fernando N. Dulout” (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias UNLP, La Plata, Argentina
- Laboratorio de Microbiología de Alimentos, Facultad de Ciencias Veterinarias UNLP, La Plata, Argentina
| | - Viviana Restovich
- IPCVA–Instituto de Promoción de la Carne Vacuna Argentina, Ciudad Autónoma de Buenos Aires, Argentina
| | - Lucía Galli
- IGEVET—Instituto de Genética Veterinaria “Ing. Fernando N. Dulout” (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias UNLP, La Plata, Argentina
| | - David Teitelbaum
- IPCVA–Instituto de Promoción de la Carne Vacuna Argentina, Ciudad Autónoma de Buenos Aires, Argentina
| | - Marcelo Signorini
- CONICET—EEA Rafaela, Instituto Nacional de Tecnología Agropecuaria (INTA), Santa Fe, Argentina
| | - Hebe Brasesco
- IPCVA–Instituto de Promoción de la Carne Vacuna Argentina, Ciudad Autónoma de Buenos Aires, Argentina
| | - Alejandra Londero
- IGEVET—Instituto de Genética Veterinaria “Ing. Fernando N. Dulout” (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias UNLP, La Plata, Argentina
| | - Diego García
- IPCVA–Instituto de Promoción de la Carne Vacuna Argentina, Ciudad Autónoma de Buenos Aires, Argentina
| | - Nora Lía Padola
- CIVETAN–Centro de Investigación Veterinaria Tandil (CONICET, CICPBA), Facultad de Ciencias Veterinarias, UNCPBA, Tandil, Argentina
| | - Valeria Superno
- IPCVA–Instituto de Promoción de la Carne Vacuna Argentina, Ciudad Autónoma de Buenos Aires, Argentina
| | - Marcelo Sanz
- CIVETAN–Centro de Investigación Veterinaria Tandil (CONICET, CICPBA), Facultad de Ciencias Veterinarias, UNCPBA, Tandil, Argentina
| | - Sandra Petroli
- IPCVA–Instituto de Promoción de la Carne Vacuna Argentina, Ciudad Autónoma de Buenos Aires, Argentina
| | - Magdalena Costa
- IGEVET—Instituto de Genética Veterinaria “Ing. Fernando N. Dulout” (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias UNLP, La Plata, Argentina
| | - Mariana Bruzzone
- IPCVA–Instituto de Promoción de la Carne Vacuna Argentina, Ciudad Autónoma de Buenos Aires, Argentina
| | - Adriana Sucari
- Centro Estudios Infectológicos “Dr. Daniel Stamboulian”, División Alimentos, Ciudad Autónoma de Buenos Aires, Argentina
| | - Marcela Ferreghini
- IPCVA–Instituto de Promoción de la Carne Vacuna Argentina, Ciudad Autónoma de Buenos Aires, Argentina
| | - Luciano Linares
- Laboratorio de Microbiología de Alimentos, Facultad de Ciencias Veterinarias UNLP, La Plata, Argentina
| | - Germán Suberbie
- SENASA–Servicio Nacional de Sanidad y Calidad Agroalimentaria, Ciudad Autónoma de Buenos Aires, Argentina
| | - Ricardo Rodríguez
- Instituto de Economía (CICPES, INTA), Ciudad Autónoma de Buenos Aires, Argentina
| | - Gerardo A. Leotta
- IGEVET—Instituto de Genética Veterinaria “Ing. Fernando N. Dulout” (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias UNLP, La Plata, Argentina
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Alonso MZ, Sanz ME, Irino K, Krüger A, Lucchesi PMA, Padola NL. Isolation of atypical enteropathogenic Escherichia coli from chicken and chicken-derived products. Br Poult Sci 2016; 57:161-4. [PMID: 26810335 DOI: 10.1080/00071668.2015.1135502] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Atypical enteropathogenic Escherichia coli (EPEC) strains from chicken and chicken-derived products were isolated and characterised. The strains presented a wide variety of serotypes, some have been reported in other animal species (O2:H40, O5:H40) and in children with diarrhoea (O8:H-). Most of the strains carried intimin β. The results indicate that chicken and chicken products are important sources of atypical EPEC strains that could be associated with human disease, and highlight the need to improve hygiene practices in chicken slaughtering and meat handling.
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Affiliation(s)
- M Z Alonso
- a Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET, Departamento de Sanidad Animal y Medicina Preventiva, Facultad de Ciencias Veterinarias , UNCPBA , Tandil , Argentina
| | | | - K Irino
- c Department of Bacteriology , Instituto Adolfo Lutz , Sao Paulo , Brazil
| | - A Krüger
- a Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET, Departamento de Sanidad Animal y Medicina Preventiva, Facultad de Ciencias Veterinarias , UNCPBA , Tandil , Argentina
| | - P M A Lucchesi
- a Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET, Departamento de Sanidad Animal y Medicina Preventiva, Facultad de Ciencias Veterinarias , UNCPBA , Tandil , Argentina
| | - N L Padola
- a Laboratorio de Inmunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET, Departamento de Sanidad Animal y Medicina Preventiva, Facultad de Ciencias Veterinarias , UNCPBA , Tandil , Argentina
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de la Torre E, Colello R, Fernández D, Etcheverría A, Conza JD, Gutkind GO, Tapia MO, Dieguez SN, Soraci AL, Padola NL. Multidrug resistance in Escherichia coli carrying integrons isolated from a pig farm with moderate antibiotic use. J GEN APPL MICROBIOL 2015; 61:270-3. [DOI: 10.2323/jgam.61.270] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Eulalia de la Torre
- Área de Toxicología, Departamento de Fisiopatología, Centro de Investigación Veterinaria de Tandil-Consejo Nacional de Investigaciones Científicas y Técnica - Comisión de Investigaciones Científicas Provincia de Buenos Aires (CIVETAN-CONICET-CICPBA), Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Campus Universitario
| | - Rocío Colello
- Área de Inmunoquímica y Biotecnología, Departamento de Sanidad Animal y Medicina Preventiva (SAMP), CIVETAN-CONICET-CICPBA, Facultad de Ciencias Veterinarias, UNCPBA, Campus Universitario
| | - Daniel Fernández
- Área de Inmunoquímica y Biotecnología, Departamento de Sanidad Animal y Medicina Preventiva (SAMP), CIVETAN-CONICET-CICPBA, Facultad de Ciencias Veterinarias, UNCPBA, Campus Universitario
| | - Analía Etcheverría
- Área de Inmunoquímica y Biotecnología, Departamento de Sanidad Animal y Medicina Preventiva (SAMP), CIVETAN-CONICET-CICPBA, Facultad de Ciencias Veterinarias, UNCPBA, Campus Universitario
| | - José Di Conza
- Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires (UBA)
- Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral
| | - Gabriel O. Gutkind
- Facultad de Farmacia y Bioquímica, UBA
- Hospital de Clínicas de la UBA “José de San Martín”
| | - María Ofelia Tapia
- Área de Toxicología, Departamento de Fisiopatología, Centro de Investigación Veterinaria de Tandil-Consejo Nacional de Investigaciones Científicas y Técnica - Comisión de Investigaciones Científicas Provincia de Buenos Aires (CIVETAN-CONICET-CICPBA), Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Campus Universitario
| | - Susana N. Dieguez
- Área de Toxicología, Departamento de Fisiopatología, Centro de Investigación Veterinaria de Tandil-Consejo Nacional de Investigaciones Científicas y Técnica - Comisión de Investigaciones Científicas Provincia de Buenos Aires (CIVETAN-CONICET-CICPBA), Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Campus Universitario
| | - Alejandro Luis Soraci
- Área de Toxicología, Departamento de Fisiopatología, Centro de Investigación Veterinaria de Tandil-Consejo Nacional de Investigaciones Científicas y Técnica - Comisión de Investigaciones Científicas Provincia de Buenos Aires (CIVETAN-CONICET-CICPBA), Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Campus Universitario
| | - Nora Lía Padola
- Área de Inmunoquímica y Biotecnología, Departamento de Sanidad Animal y Medicina Preventiva (SAMP), CIVETAN-CONICET-CICPBA, Facultad de Ciencias Veterinarias, UNCPBA, Campus Universitario
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Abstract
Shiga toxin-producing Escherichia coli (STEC) cause hemorrhagic colitis (HC) and hemolytic uremic syndrome (HUS) in humans. Outbreaks are linked to bovine food sources. STEC O157:H7 has been responsible for the most severe outbreaks worldwide. However, non-O157 serotypes have emerged as important enteric pathogens in several countries. The main virulence factor of STEC is the production of Shiga toxins 1 and 2. Additional virulence markers are a plasmid-encoded enterohemolysin (ehxA), an autoagglutinating adhesin (Saa), a catalase-peroxidase (katP), an extracellular serine protease (espP), a zinc metalloprotease (stcE), a subtilase cytotoxin (subAB), among others. Other virulence factors are intimin and adhesins that had a roll in the adherence of STEC to bovine colon. This review focuses on the virulence traits of STEC and especially on those related to the adhesion to bovine colon. The known of the interaction between STEC and the bovine host is crucial to develop strategies to control cattle colonization.
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Affiliation(s)
- Analía Inés Etcheverría
- Laboratorio de Imunoquímica y Biotecnología, Centro de Investigación Veterinaria de Tandil (CIVETAN), CONICET-CICPBA, Facultad de Ciencias Veterinarias, UNCPBA, Tandil, Argentina.
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Alonso MZ, Padola NL, Parma AE, Lucchesi PMA. Enteropathogenic Escherichia coli contamination at different stages of the chicken slaughtering process. Poult Sci 2011; 90:2638-41. [PMID: 22010252 DOI: 10.3382/ps.2011-01621] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Enteropathogenic Escherichia coli is a foodborne pathogen that produces potentially fatal infant diarrhea, noticeably in developing countries. The aim of this study was to detect EPEC contamination by PCR at different stages of the chicken slaughtering process. We collected swabs from chicken cloacae and washed carcasses (external and visceral cavity) during the slaughtering process in 3 sampling occasions. Unwashed eviscerated carcasses were also sampled (at the visceral cavity) in the second and third sampling occasions. Enteropathogenic Escherichia coli was detected in 6 to 28% of cloacal samples, 39 and 56% of unwashed eviscerated carcasses, and 4 to 58% of washed carcasses. None of the samples were positive for bfpA, suggesting contamination with atypical EPEC. The detection of EPEC at different stages of the chicken slaughtering process showed that the proportion of contaminated samples remained or even increased during processing. In addition, the high proportion of contaminated carcasses during chicken processing represents a risk for the consumers and a challenge to improve procedures for those working in the sanitary control service.
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Affiliation(s)
- M Z Alonso
- Departamento Sanidad Animal y Medicina Preventiva, Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
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Fernández D, Rodríguez EM, Arroyo GH, Padola NL, Parma AE. Seasonal variation of Shiga toxin-encoding genes (stx) and detection of E. coli O157 in dairy cattle from Argentina. J Appl Microbiol 2009; 106:1260-7. [PMID: 19187162 DOI: 10.1111/j.1365-2672.2008.04088.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To study the seasonal variation of Shiga toxin-encoding genes (stx) and to investigate the presence of Shiga toxin-producing Escherichia coli (STEC) O157 in cattle belonging to five dairy farms from Argentina. METHODS AND RESULTS Rectal swab samples were collected from 360 dairy cows in each season and 115 and 137 calves in autumn and in spring, respectively. The stx were investigated by multiplex PCR and it was used as the indicator for STEC. Samples positives for stx were tested by PCR for eae-gamma1 of E. coli O157 and then subjected to IMS (immunomagnetic separation). In positive animals significant differences in the prevalence of stx between warm and cold seasons were detected. In warm seasons, stx1 + stx2 increased and stx1 decreased, independently of the animal category. The prevalence of STEC O157 in cows and calves were 0.2% and 0.8%, respectively. CONCLUSIONS This work provides new data about the occurrence of stx and STEC O157 in dairy herds from Argentina and suggests a relationship between the type of stx and season of year. SIGNIFICANCE AND IMPACT OF STUDY The detection of STEC O157 and the seasonality of stx and its types provide an opportunity to improve control strategies designed to prevent contamination of food products and transmission animal-person.
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Affiliation(s)
- D Fernández
- Laboratorio de Inmunoquímica y Biotecnología, Tandil, Argentina
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Parma AE, Sanz ME, Blanco JE, Blanco J, Viñas MR, Blanco M, Padola NL, Etcheverría AI. Virulence genotypes and serotypes of verotoxigenic Escherichia coli isolated from cattle and foods in Argentina. Importance in public health. Eur J Epidemiol 2001; 16:757-62. [PMID: 11142505 DOI: 10.1023/a:1026746016896] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Virulence factors of Verotoxin-producing Escherichia coli (VTEC) strains isolated from hamburgers and ground beef were studied in Argentina by PCR. Their virulence profiles were correlated with those corresponding to strains isolated from calves and adult cattle. Most virulent profiles (VTs+ eae+ Mp+) were present in E. coli from healthy and diarrheic calves corresponding to O5:H-, O5:H27, O20:H?, O26:H11, O38:H?, O103:H-, O103:H2, O111:H-, O118:H16, O165:H-serotypes. The presence of the eae gene was significantly more frequent among VTEC strains isolated from calves (20/26; 76%) than from adult cattle (1/39; 2.5%) (p < 0.005). VT2+ eae- E. coli was prevalent in foods and adult cattle at slaughterhouse. The prevalence of the eae gene was similar between VTEC strains isolated from meat (0/21) and adult cattle (1/39; 2.5%) which constitutes the main population processed at slaughterhouses in Argentina. Serotyping showed that VTEC strains were distributed among 31 serotypes, some of which (O20:H19, O91:H21, O113:H21, O116:H21, O117:H7, O171:H2, OX3:H21) were shared between bovine and food strains. These O serogroups have been isolated from cases of haemorrhagic colitis (HC) and haemolyticuraemic syndrome (HUS) in humans in several continental European countries. This study confirms the role of cattle as a reservoir of many VTEC serotypes other than O157:H7 and represents a base for future diagnostic, prevention and control strategies of EHEC in this country. In addition, this study affirms the advantages of PCR-based screening of E. coli isolates given the finding of so many verotoxin-producing strains.
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Affiliation(s)
- A E Parma
- Laboratorio de Inmunoquímica y Biotecnología, FCV, UNICEN, Tandil, Argentina.
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