<?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>S2007-11242020000100167</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v11i1.4998</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Relación genética, formación de biopelículas, movilidad y virulencia de Escherichia coli aislada de mastitis bovina]]></article-title>
<article-title xml:lang="en"><![CDATA[Genetic relationships, biofilm formation, motility and virulence of Escherichia coli isolated from bovine mastitis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Soto]]></surname>
<given-names><![CDATA[Alejandro Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toro-Castillo]]></surname>
<given-names><![CDATA[Valentín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Munguía-Magdaleno]]></surname>
<given-names><![CDATA[Cristián Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Flores]]></surname>
<given-names><![CDATA[José Emmanuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Pantoja]]></surname>
<given-names><![CDATA[Luis Enrique]]></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 contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Mejía]]></surname>
<given-names><![CDATA[Rafael]]></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>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>11</volume>
<numero>1</numero>
<fpage>167</fpage>
<lpage>182</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242020000100167&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242020000100167&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242020000100167&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Escherichia coli es una de las bacterias ambientales que frecuentemente se ha visto implicada en infecciones de la glándula mamaria bovina. Aunque se desconocen los factores de virulencia específicos involucrados en dicho proceso, se ha observado que las bacterias formadoras de biopelículas se asocian con infecciones persistentes. De igual forma se ha planteado que las bacterias móviles pueden ser más patógenas. El propósito del trabajo fue analizar la relación genética, capacidad de formación de biopelículas y movilidad de E. coli aislada de casos de mastitis bovina, así como la virulencia in vivo de aislados representativos. El 67.7 % de las bacterias pertenece al grupo filogenético A, el 17.6 % al grupo B1 y el 14.7 % al D. El estudio de la relación genética mediante (GTG)5 reveló que solo dos bacterias son idénticas genéticamente, el resto se organizaron en siete grupos distintos con 70 % de similitud. El 76.5 % de las bacterias fue capaz de formar biopelículas de forma fuerte, moderada o débil. Además, los genes csgA y fimA se detectaron en el 52.9 % de las bacterias formadoras de biopelículas. El análisis de movilidad mostró que el 70.6 % fue móvil. Mientras que, el análisis de patogenicidad en larvas de Galleria mellonella reveló que bacterias formadoras de películas y móviles fueron capaces de matar un mayor número de larvas a las 24 h que las no formadoras. Los resultados indican que las E. coli causantes de mastitis bovina son muy diversas y pertenecen principalmente al grupo filogenético A y que las formadoras de biopelículas y móviles son más patógenas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstracts Escherichia coli is an environmental bacterium frequently implicated in bovine mammary infections. Although specific virulence factors are unknown, biofilm-forming bacteria are associated with persistent infections, and motile bacteria exhibit increased virulence. An analysis was done of the genetic relationship, biofilm formation capacity and motility of bovine mastitis-associated E. coli, as well as the in vivo virulence of representative bacterial isolates. Of the 34 isolates, 67.7 % belonged to phylogenetic group A, 17.6 % to group B1 and 14.7 % to group D. Genetic relationship analysis done with (GTG)5-PCR indicated that the analyzed bacteria are diverse, with only two isolates exhibiting 100 % similarity, and the remaining 32 being grouped into seven main clusters with more than 70 % similarity. Biofilm formation capacity ranged from strong to moderate and weak in 76.5 % of the isolates. The csgA and fimA genes were detected in 52.9 % of the biofilm-forming isolates. Most (70.6 %) of the isolates were motile. In vivo infection assays using Galleria mellonella showed the biofilm-forming bacteria to be more pathogenic than the non-biofilm-forming ones. The studied bovine mastitis-associated E. coli were genetically diverse. Biofilm formation capacity and motility were variable among the isolates, but the biofilm-forming bacteria were more pathogenic than the non-biofilm-forming ones.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[E. coli]]></kwd>
<kwd lng="es"><![CDATA[Mastitis bovina]]></kwd>
<kwd lng="es"><![CDATA[Diversidad]]></kwd>
<kwd lng="es"><![CDATA[Biopelículas]]></kwd>
<kwd lng="es"><![CDATA[Virulencia]]></kwd>
<kwd lng="en"><![CDATA[E. coli]]></kwd>
<kwd lng="en"><![CDATA[Bovine mastitis]]></kwd>
<kwd lng="en"><![CDATA[Diversity]]></kwd>
<kwd lng="en"><![CDATA[Biofilm]]></kwd>
<kwd lng="en"><![CDATA[Virulence]]></kwd>
</kwd-group>
</article-meta>
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