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Memorias del Instituto de Investigaciones en Ciencias de la Salud (Mem. Inst. Investig. Cienc. Salud) is the official publication of the Institute of Research in Health Sciences (IICS) of the National University of Asunción (UNA), Paraguay. It publishes original scientific contributions in clinical medicine, biomedical research, microbiology, molecular biology, dentistry, nursing, nutrition, public health, health biotechnology, genetics, biochemistry, and related disciplines. Founded in 1983, the journal adopted its current name in 2002 and has been published exclusively online since 2015, incorporating XML article dissemination as of 2024. Since 2023, it operates under a continuous publication model. The journal accepts manuscripts in Spanish and English as original research articles, reviews, case studies, and brief communications. All content is available in open access, free of charge for authors and readers, under the Creative Commons Attribution 4.0 International License, in accordance with the Budapest Open Access Initiative (BOAI). It is indexed in BVS, SciELO Paraguay, HINARI, LILACS, DOAJ, Latindex, MIAR, Dialnet, CiteFactor, Google Scholar, LivRe, BASE, EBSCO, and Web of Science – SciELO Citation Index. The journal is funded by IICS-UNA, supports the OAI-PMH protocol for metadata harvesting, and uses the LOCKSS system for digital preservation of its contents.

 
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Manuscripts submitted to Memorias del Instituto de Investigaciones en Ciencias de la Salud undergo a double-blind peer review process, in which the identities of both authors and reviewers remain anonymous throughout the evaluation. Each manuscript is assessed by a minimum of two external reviewers with expertise in the relevant subject area, who are given a period of 30 days to submit their evaluation. Reviewers assess the originality, methodological rigor, scientific relevance, and clarity of presentation of each work. Based on the reviewers' reports, the Editorial Committee decides whether to accept, request revisions, or reject the manuscript, and communicates the decision to the authors as promptly as possible. This process ensures impartiality, transparency, and the scientific quality of published articles.

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The Institute of Research in Health Sciences (IICS) of the National University of Asunción (UNA) invites researchers, academics, and health professionals to submit their manuscripts for consideration in the 2026 Volume of Memorias del Instituto de Investigaciones en Ciencias de la Salud (Mem. Inst. Investig. Cienc. Salud). The journal accepts original and unpublished contributions in Spanish as original research articles, review articles, case studies, and brief communications, in the areas of clinical medicine, biomedical research, microbiology, molecular biology, dentistry, nursing, nutrition, public health, health biotechnology, genetics, biochemistry, and related disciplines. The call for submissions is open and ongoing, and manuscripts may be submitted at any time of the year through the journal's online submission system. All received manuscripts undergo double-blind peer review. The journal is open access, with no charges for authors or readers. For further information on submission guidelines, please refer to the author instructions available on the journal's website.

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Portación de fimH en aislados de Escherichia coli productor de Toxina Shiga provenientes de ganado bovino, Departamento Cordillera, Paraguay

Authors

  • Melisa Florentín
  • Patricia Acuña Author
  • Natalia Rojas Author
  • Fátima Rodríguez Author
  • Rosa Guillén Author

DOI:

https://doi.org/10.18004/mem.iics/1812-9528/2018.016(01)33-038

Keywords:

STEC, biofilm, ganado bovino

Abstract

Ciertas cepas de Escherichia coli productoras de toxina Shiga (STEC) tienen la capacidad de formar biofilm en alimentos y otras superficies, aumentando su potencial como fuente de contaminación. El gen fimH se ha asociado a la capacidad de formación de biofilm en E.coli. Este estudio observacional descriptivo de corte transverso se realizó con el objetivo de describir la portación de fimH en aislados STEC provenientes de muestras de materia fecal de ganado bovino del Departamento de Cordillera en el 2016. Los aislados de STEC se obtuvieron por cultivos, extracción de ADN y amplificación por PCR de genes stx1 y stx2. El gen fimH se detectó por PCR convencional. Un total de 1006 aislamientos de E. coli se sometieron a extracción de ADN y amplificación por PCR para genes stx1 y stx2. De éstos, 269 se identificaron como STEC, en los que la detección del gen fimH se realizó por PCR convencional. Un producto de PCR representativo se sometió a secuenciación del gen fimH y mostró 100% de homología con secuencias de la Base de Datos de GenBank. De 269 aislamientos STEC, 129 aislamientos (48%) resultaron ser portadores del gen fimH y por tanto con potencial de formar biofilm. Esta frecuencia elevada representa un riesgo de persistencia de estos patógenos en elementos y superficies de trabajo de sitios de expendio y manipulación de productos cárnicos. Este trabajo contribuye como una herramienta esencial para seguir con la línea de investigación, obteniendo datos de suma importancia que ayuden a describir la situación de riesgo de contaminación alimentaria en que se encuentra el país.

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References

Brusa V, Aliverti V, Aliverti F, Ortega EE, de la Torre JH, Linares LH, et al. Shiga toxin-producing Escherichia coli in beef retail markets from Argentina. Front Cell Infect Microbiol. 2012;2:171.

Hur J, Jeon BW, Kim YJ, Oh IG, Lee JH. Escherichia coli isolates from calf diarrhea in Korea and their virulent genetic characteristics. J Vet Med Sci. 2013;75(4):519–22.

Varela G, Chinen I, Gadea P, Miliwebsky E, Mota MI, González S, et al. Detección y caracterización de Escherichia coli productor de toxina Shiga a partir de casos clínicos y de alimentos en Uruguay. Rev Argent Microbiol. 2008;40(2):93–100.

Etcheverría AI, Padola NL. Shiga toxin-producing Escherichia coli. Virulence. 2013;4(5):366–72.

Biscola FT, Abe CM, Guth BEC. Determination of adhesin gene sequences in, and biofilm formation by, O157 and non-O157 Shiga toxin-producing Escherichia coli strains isolated from different sources. Appl Environ Microbiol. 2011;77(7):2201–8.

Costerton JW, Stewart PS, Greenberg EP. Bacterial biofilms. Science. 1999; 284(5418):1318–22.

Chmielewski R, Frank J. Biofilm Formation and Control in Food Processing Facilities. Compr Rev Food Sci Food Saf. 2003;2(1):22–32.

Finlay BB, Falkow S. Common themes in microbial pathogenicity revisited. Microbiol Mol Biol Rev MMBR. 1997;61(2):136–69.

Pratt LA, Kolter R. Genetic analysis of Escherichia coli biofilm formation: roles of flagella, motility, chemotaxis and type I pili. Mol Microbiol. 1998;30(2):285–93.

Rivelli SM, Guillén R. Caracterización molecular de factores de virulencia de aislados de Escherichia coli provenientes de ganado bovino del Paraguay. [master´s thesis]. Paraguay: Universidad Nacional de Asunción; 2015.

Johnson JR, Stell AL. Extended Virulence Genotypes of Escherichia coli Strains from Patients with Urosepsis in Relation to Phylogeny and Host Compromise. J Infect Dis. 2000;181(1):261–72.

Polifroni R, Etcheverría AI, Padola NL, Parma AE. Escherichia coli verocitotoxigénico (VTEC): Características de virulencia y persistencia en el medio ambiente. InVet. 2009;11(1):65–70.

Villegas N, Baronetti J, Albesa I, Polifroni R, Parma A, Etcheverría A, et al. Relevance of Biofilms in the Pathogenesis of Shiga-Toxin-Producing Escherichia coli Infection. Sci World J;2013.

Carpentier B. Biofilms and their consequences, with particular reference to hygiene in the food industry. Journal of Applied Microbiology. 2008;75(6):499-511.

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Published

2018-04-01

Issue

Section

Original Articles

How to Cite

Florentín, M., Acuña, P., Rojas, N., Rodríguez, F., & Guillén, R. (2018). Portación de fimH en aislados de Escherichia coli productor de Toxina Shiga provenientes de ganado bovino, Departamento Cordillera, Paraguay. Memorias Del Instituto De Investigaciones En Ciencias De La Salud, 16(1), 33-38. https://doi.org/10.18004/mem.iics/1812-9528/2018.016(01)33-038