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1.
Biomedica ; 43(4): 474-482, 2023 12 01.
Article in English, Spanish | MEDLINE | ID: mdl-38109140

ABSTRACT

INTRODUCTION: Shiga toxin-producing Escherichia coli (STEC) is a foodborne pathogen associated with clinical cases of diarrhea in humans. Its main virulence factors are the Shiga toxins (Stx1 and Stx2). Cattle are the main reservoir of STEC, and many outbreaks in humans have been related to the consumption of undercooked ground beef contaminated with this pathogen. OBJECTIVE: To determine the prevalence of STEC in ground beef commercialized in all the butcher shops of a township in the department of Quindío and to characterize the virulence genes of the strains found. MATERIALS AND METHODS: Thirty ground beef samples were taken in three different times; stx genes and other STEC virulence factors (eae, ehxA, saa) were detected by multiplex PCR. RESULTS: The overall prevalence of STEC was 33.33 % (10/30 positive samples). We isolated eight non-O157 (LEE-negative) strains with four different genetic profiles: stx2 / stx2-ehxA-saa / stx1-stx2-ehxA-saa / stx1-saa. CONCLUSION: This is the first report on the prevalence of STEC in ground beef in a township in the department of Quindío.


Introducción: Escherichia coli productora de toxina Shiga (STEC) es un agente patógeno de origen alimentario asociado a casos clínicos de diarrea en humanos; sus principales factores de virulencia son las toxinas Shiga (Stx1 y Stx2). El principal reservorio de STEC es el ganado bovino y muchos brotes en humanos se han relacionado con el consumo de carne mal cocida contaminada con este agente patógeno. Objetivo: El objetivo de este trabajo fue determinar la prevalencia de STEC en carne molida comercializada en todas las carnicerías de un municipio del departamento del Quindío y caracterizar los genes de virulencia de las cepas encontradas. Materiales y métodos: Se tomaron 30 muestras de carne molida en tres momentos diferentes; se detectaron los genes stx y otros factores de virulencia de STEC (eae, ehxA, saa) mediante PCR Multiplex. Resultados: Los resultados mostraron una prevalencia global de STEC del 33,33 % (10/30 muestras positivas). En total se aislaron ocho cepas STEC no-O157 (LEE-negativas) con cuatro perfiles genéticos diferentes: stx2 / stx2-ehxA-saa / stx1-stx2-ehxA-saa / stx1-saa. Conclusión: Este es el primer reporte que muestra la prevalencia de STEC en carne molida en un municipio del departamento del Quindío.


Subject(s)
Diarrhea , Escherichia coli , Humans , Cattle , Animals , Colombia/epidemiology , Prevalence , Diarrhea/epidemiology , Virulence Factors/genetics
2.
Biomédica (Bogotá) ; 43(4): 474-482, dic. 2023. tab
Article in English | LILACS | ID: biblio-1533959

ABSTRACT

Introduction. Shiga toxin-producing Escherichia coli (STEC) is a foodborne pathogen associated with clinical cases of diarrhea in humans. Its main virulence factors are the Shiga toxins (Stx1 and Stx2). Cattle are the main reservoir of STEC, and many outbreaks in humans have been related to the consumption of undercooked ground beef contaminated with this pathogen. Objective. To determine the prevalence of STEC in ground beef commercialized in all the butcher shops of a township in the department of Quindío and to characterize the virulence genes of the strains found. Materials and methods. Thirty ground beef samples were taken in three different times; stx genes and other STEC virulence factors (eae, ehxA, saa) were detected by multiplex PCR. Results. The overall prevalence of STEC was 33.33 % (10/30 positive samples). We isolated eight non-O157 (LEE-negative) strains with four different genetic profiles: stx 2 / stx 2-ehxA-saa / stx 1-stx 2-ehxA-saa / stx 1-saa. Conclusion. This is the first report on the prevalence of STEC in ground beef in a township in the department of Quindío.


Introducción. Escherichia coli productora de toxina Shiga (STEC) es un agente patógeno de origen alimentario asociado a casos clínicos de diarrea en humanos; sus principales factores de virulencia son las toxinas Shiga (Stx1 y Stx2). El principal reservorio de STEC es el ganado bovino y muchos brotes en humanos se han relacionado con el consumo de carne mal cocida contaminada con este agente patógeno. Objetivo. El objetivo de este trabajo fue determinar la prevalencia de STEC en carne molida comercializada en todas las carnicerías de un municipio del departamento del Quindío y caracterizar los genes de virulencia de las cepas encontradas. Materiales y métodos. Se tomaron 30 muestras de carne molida en tres momentos diferentes; se detectaron los genes stx y otros factores de virulencia de STEC (eae, ehxA, saa) mediante PCR Multiplex. Resultados. Los resultados mostraron una prevalencia global de STEC del 33,33 % (10/30 muestras positivas). En total se aislaron ocho cepas STEC no-O157 (LEE-negativas) con cuatro perfiles genéticos diferentes: stx 2 / stx 2-ehxA-saa / stx 1-stx 2-ehxA-saa / stx 1-saa. Conclusión. Este es el primer reporte que muestra la prevalencia de STEC en carne molida en un municipio del departamento del Quindío.


Subject(s)
Shiga-Toxigenic Escherichia coli , Prevalence
3.
Rev. argent. microbiol ; 54(3): 31-40, set. 2022. graf
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1407193

ABSTRACT

Resumen Este estudio evaluó las condiciones higiénico-sanitarias de carnicerías de la ciudadde Tandil (provincia de Buenos Aires) mediante una estimación del riesgo basada en encuestasdirigidas a revisar las buenas prácticas de manufactura y de higiene de los establecimientos. Seutilizó una escala de 1 a 100 para clasificar a los establecimientos en las categorías de riesgoalto (0-40), riesgo moderado (41-70) y riesgo bajo (71-100). A su vez, se evaluó la presencia deSalmonella spp., Staphylococcus aureus, Escherichia coli productor de toxina Shiga (STEC) encarne bovina picada y en muestras ambientales como mesada, cuchilla, picadora y manos delcarnicero. Las muestras se tomaron una sola vez e inmediatamente se refrigeraron y transpor-taron al laboratorio para su análisis. En el período de estudio todas las carnicerías (100) fueronclasificadas como de «riesgo bajo¼ y con buenas condiciones higiénico-sanitarias. No obstante,el 75% de las muestras de carne picada no cumplió con al menos uno de los criterios microbiológicos establecidos en el Artículo 255 del Código Alimentario Argentino. Se sugiere estableceruna estrategia tendiente a identificar los desvíos e implementar un plan de mejoras continuasen las carnicerías de la ciudad de Tandil.


Abstract The aim of this work was to evaluate the hygienic-sanitary conditions of butcher shops in Tandil, Buenos Aires Province, by estimating the risk based on good manufacturing and hygiene practices, through surveys of the establishments. The analysis was performed using a scale of 1-100, and classifying them as high risk (0-40), moderate risk (41-70) or low risk (71-100). The presence of Salmonella spp., Staphylococcus aureus and Shiga toxin-producing Escherichia coli (STEC) from both, ground beef and environmental samples such as countertop, cleaver, mincer and butcher's hands, taken at butcher shops was also evaluated. Sampling was performed only once and immediately refrigerated and transported to the laboratory for analysis. All butcher shops evaluated (100) were classified as "low risk'' with good hygienic-sanitary conditions. However, 75% of the ground beef samples analyzed did not meet at least one of the microbiological criteria established in the Código Alimentario Argentino [Argentine Food Code], article 255. We propose to establish a strategy to identify deviations and implement a plan for continuous improvement in butcher shops of Tandil city.

4.
Rev Argent Microbiol ; 54(3): 215-219, 2022.
Article in Spanish | MEDLINE | ID: mdl-34556377

ABSTRACT

The aim of this work was to evaluate the hygienic-sanitary conditions of butcher shops in Tandil, Buenos Aires Province, by estimating the risk based on good manufacturing and hygiene practices, through surveys of the establishments. The analysis was performed using a scale of 1-100, and classifying them as high risk (0-40), moderate risk (41-70) or low risk (71-100). The presence of Salmonella spp., Staphylococcus aureus and Shiga toxin-producing Escherichia coli (STEC) from both, ground beef and environmental samples such as countertop, cleaver, mincer and butcher's hands, taken at butcher shops was also evaluated. Sampling was performed only once and immediately refrigerated and transported to the laboratory for analysis. All butcher shops evaluated (100) were classified as "low risk" with good hygienic-sanitary conditions. However, 75% of the ground beef samples analyzed did not meet at least one of the microbiological criteria established in the Código Alimentario Argentino [Argentine Food Code], article 255. We propose to establish a strategy to identify deviations and implement a plan for continuous improvement in butcher shops of Tandil city.


Subject(s)
Shiga-Toxigenic Escherichia coli , Animals , Argentina , Cattle , Food Microbiology , Meat/microbiology , Salmonella , Staphylococcus aureus
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