<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0122-0268</journal-id>
<journal-title><![CDATA[Revista MVZ Córdoba]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.MVZ Cordoba]]></abbrev-journal-title>
<issn>0122-0268</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Córdoba - Facultad de Medicina Veterinaria y Zootecnia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-02682023000300001</article-id>
<article-id pub-id-type="doi">10.21897/rmvz.3219</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Escherichia coli y Salmonella spp. portadoras de mcr-1 en planta de beneficio porcino, Medellín (Colombia)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palacio-Arias]]></surname>
<given-names><![CDATA[Carlos A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cienfuegos-Gallet]]></surname>
<given-names><![CDATA[Astrid V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Silva]]></surname>
<given-names><![CDATA[Jorge A]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vásquez-Jaramillo]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agrarias Escuela de Medicina Veterinaria, grupo de investigación Centauro]]></institution>
<addr-line><![CDATA[Ciudadela Robledo, Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Antioquia Escuela de Microbiología Grupo de Microbiología Molecular]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>28</volume>
<numero>3</numero>
<fpage>1</fpage>
<lpage>10</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-02682023000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-02682023000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-02682023000300001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivo. Evaluar la resistencia adquirida a colistina mediada por el gen mcr-1 en aislados de E. coli y Salmonella spp., de muestras de materia fecal de porcinos con destino a consumo humano en planta de benefício animal de Medellín, Colombia.  Materiales y métodos. Se realizó un estudio descriptivo, tomando 190 muestras de materia fecal de porcinos durante marzo del 2020. Para la tamización de enterobacterias resistentes a colistina se utilizó agar cromogénico y MacConkey suplementado con sulfato de colistina (2 mg/l). Los aislados fueron analizados mediante PCR para identificar el gen mcr-1, identificación bacteriana y perfil de susceptibilidad antibiótica a los aislados positivos al gen mcr-1 por el sistema automatizado Microscan®. La información fue registrada y analizada mediante estadística descriptiva.  Resultados. La frecuencia de porcinos con aislados resistentes a colistina en la tamización fue del 70.52% (134/190). El 15.78% (30/190) portadores del gen mcr-1 de los cuales el 1.05% (2/190) pertenecieron a la especie Salmonella entérica y el 4.21% (8/190) E. coli. Se identificó en los aislados positivos al gen mcr-1 la capacidad de resistir la acción de múltiples antibióticos (10/10), y una E. coli con la habilidad de producir betalactamasas de espectro extendido (BLEE). La mayoría de los cerdos con enterobacterias portadoras del gen mcr-1 provenían de granjas del departamento de Antioquia, y todos en etapa de levante y ceba.  Conclusiones. Este estudio evidencia la circulación del gen mcr-1 en cerdos al sacrificio, representando un riesgo potencial para la salud pública por su posible entrada a la cadena alimentaria.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Objective. This study aimed to evaluate the acquired mcr-1 gene-mediated colistin resistance in Escherichia coli and Salmonella spp. isolates obtained from fecal samples in pigs destined for human consumption at slaughterhouse located in Medellín (Colombia).  Materials and methods. A descriptive study was carried out, in which 190 fecal samples were collected from pigs at the slaughterhouse in March 2020. Colistin sulfate-supplemented chromogenic and MacConkey agars were used for the screening of colistin-resistant enterobacteria. The selected isolates were analyzed by PCR to identify the presence of the mcr-1 gene. Bacterial identification and antibiotic susceptibility profile were performed on mcr-1 gene-positive isolates by the automated Microscan® system. The information was collected and analyzed using descriptive statistics.  Results. The 70.52% (134/190) of the animals were positive for colistin-resistant isolates by the screening test. The 15.78% (30/190) of the isolates were mcr-1 gene carriers, of which 1.05% (2/190) belong to Salmonella enterica species and 4.21% (8/190) were E. coli. A multiple antibiotics resistance profile (10/10) and an extended-spectrum beta-lactamase (ESBL) -producing E. coli were identified in all the isolates carrying the mcr-1 gene. Most of the pigs with enterobacteria carrying the mcr-1 gene came from farms located in the province of Antioquia, and all belonged to the growing-finishing production stage.  Conclusions. This study evidences the circulation of the mcr-1 type gene in pigs at the time of slaughter, representing a potentially serious threat to public health due to possible implications in the food chain.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Colistina]]></kwd>
<kwd lng="es"><![CDATA[enfermedades transmitidas por los alimentos]]></kwd>
<kwd lng="es"><![CDATA[Enterobacteriaceae]]></kwd>
<kwd lng="es"><![CDATA[Fármacoresistencia microbiana (Fuente: DeSC)]]></kwd>
<kwd lng="en"><![CDATA[Drug resistance]]></kwd>
<kwd lng="en"><![CDATA[colistin]]></kwd>
<kwd lng="en"><![CDATA[Enterobacteriaceae]]></kwd>
<kwd lng="en"><![CDATA[foodborne diseases (Source: DeSC)]]></kwd>
</kwd-group>
</article-meta>
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