<?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>2007-1124</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. pecuarias]]></abbrev-journal-title>
<issn>2007-1124</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11242017000400387</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v8i4.4251</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización molecular de Escherichia coli resistente a antibióticos aislada de mastitis bovina en Michoacán, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Molecular characterization of antibiotic resistant Escherichia coli isolated from bovine mastitis in Michoacán, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez Mejía]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gudiño Sosa]]></surname>
<given-names><![CDATA[Luis Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar López]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Loeza Lara]]></surname>
<given-names><![CDATA[Pedro Damián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de La Ciénega del Estado de Michoacán de Ocampo  ]]></institution>
<addr-line><![CDATA[Sahuayo Michoacán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>8</volume>
<numero>4</numero>
<fpage>387</fpage>
<lpage>396</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242017000400387&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242017000400387&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242017000400387&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN: En el presente estudio se describen los patrones de resistencia a antibióticos de E. coli aislada de mastitis bovina, así como la presencia de genes de virulencia y de resistencia. A partir muestras de leche obtenidas de vacas con mastitis se aislaron e identificaron a nivel bioquímico y molecular cepas de E. coli, a las cuales se les analizó el perfil de resistencia a antibióticos y mediante PCR se investigó la presencia de genes de virulencia, de resistencia a antibióticos beta-lactámicos, tetraciclina, estreptomicina y quinolonas; así como la presencia de integrones clase 1. El análisis genético reveló que 11.8 % de los aislados de E. coli presentaron el gen de virulencia que codifica para la intimina (eaeA). Por otro lado, todas las E. coli fueron resistentes a uno o más antibióticos, con alta frecuencia de resistencia para tetraciclina, ampicilina y cefalotina. Además, el 73.5 % fueron resistentes a tres o más antibióticos. De 11 genes de resistencia analizados, se confirmó la presencia de siete, distribuidos en el 79.4 % de los aislados bacterianos. De los cuales, bla CTX-M se encontró en 16 aislados, tetB en 11, tetA, strA y strB en 9, qnrB en cuatro y bla TEM en un solo aislado. También, en el 5.9 % de los aislados de E. coli se identificó la presencia de integrones clase 1. En conclusión, se encontraron elevados índices de resistencia en las E. coli aisladas de mastitis bovina. Estas bacterias contienen genes de virulencia relacionados a patógenos de humano; también llevan genes de resistencia a beta-lactámicos, tetraciclina, estreptomicina y quinolonas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT: In the present study the antibiotic resistance patterns of E. coli isolated from bovine mastitis, as well as the presence of Extended-spectrum &#946;-lactamases (ESBL), tetracycline, streptomycin, and quinolone resistance genes were analyzed. From mastitic cows, milk samples were obtained, of which E. coli were isolated and identified biochemically and confirmed at the molecular level. Genetic analysis revealed that 11.8 % of the E. coli contained a virulence gene encoding intimin (eaeA). All E. coli were resistant to one or more antibiotics, with higher rates of resistance to tetracycline, ampicillin, and cephalothin. In addition, 73.5 % of E. coli were resistant to three or more antibiotics. Of eleven resistance genes analyzed, seven were detected in 79.4 % of the bacterial isolates. Of these, bla CTX-M was found in 16 isolates, tetB in 11, tetA, strA and strB in nine, qnrB in four, and bla TEM in one isolate. About 5.9 % of the E. coli isolates carried class 1 integron integrase gene. In conclusion, a high prevalence of antibiotic resistance in E. coli isolated from bovine mastitis was identified. The bacteria also harbor a virulence gene related to human pathogens and genes conferring resistance to beta-lactam antibiotics, tetracycline, streptomycin, and quinolones.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Mastitis bovina]]></kwd>
<kwd lng="es"><![CDATA[E. coli]]></kwd>
<kwd lng="es"><![CDATA[Resistencia a los antibióticos]]></kwd>
<kwd lng="es"><![CDATA[Genes de virulencia]]></kwd>
<kwd lng="es"><![CDATA[PCR]]></kwd>
<kwd lng="en"><![CDATA[Bovine mastitis]]></kwd>
<kwd lng="en"><![CDATA[E. coli]]></kwd>
<kwd lng="en"><![CDATA[Antibiotic resistance]]></kwd>
<kwd lng="en"><![CDATA[Virulence genes]]></kwd>
<kwd lng="en"><![CDATA[PCR]]></kwd>
</kwd-group>
</article-meta>
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