<?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>0016-3813</journal-id>
<journal-title><![CDATA[Gaceta médica de México]]></journal-title>
<abbrev-journal-title><![CDATA[Gac. Méd. Méx]]></abbrev-journal-title>
<issn>0016-3813</issn>
<publisher>
<publisher-name><![CDATA[Academia Nacional de Medicina de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-38132019000400410</article-id>
<article-id pub-id-type="doi">10.24875/gmm.19004716</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Escherichia coli enterotoxigénica y enteroagregativa: prevalencia, patogénesis y modelos múridos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ríos-Muñiz]]></surname>
<given-names><![CDATA[Diana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerna-Cortés]]></surname>
<given-names><![CDATA[Jorge Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morán-García]]></surname>
<given-names><![CDATA[Nadia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meza-Segura]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estrada-García]]></surname>
<given-names><![CDATA[Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Nacional de Ciencias Biológicas Departamento de Microbiología]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<volume>155</volume>
<numero>4</numero>
<fpage>410</fpage>
<lpage>416</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-38132019000400410&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-38132019000400410&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-38132019000400410&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los patotipos de Escherichia coli enterotoxigénica (ETEC) y enteroagregativa (EAEC) son importantes agentes etiológicos causantes de diarrea en niños menores de cinco años de México y países en desarrollo, en quienes causan numerosas muertes. Ambos se han asociado con retraso en el crecimiento infantil y son los principales agentes causales de la &#8220;diarrea del viajero&#8221;. La patogénesis de ambas bacterias se inicia cuando estas se adhieren al epitelio intestinal mediante fimbrias, denominadas factores de colonización en las cepas ETEC aisladas de humano y fimbrias de adherencia agregativa en las cepas de EAEC. Una vez que ETEC se adhiere al enterocito produce una o ambas de sus toxinas e induce la secreción de iones de cloruro, sodio y agua al lumen intestinal, produciendo su característica diarrea acusa. EAEC se une al epitelio intestinal formando una biopelícula, induce la producción de moco, libera sus toxinas y promueve inflamación. Modelos de infección de EAEC y ETEC con ratones C57BL/6 silvestres y deficientes del ligando de CD40 (con microbiotas intactas), respectivamente, revelaron que la desnutrición y la dieta baja en cinc incrementan la infección de EAEC causando retraso en el crecimiento y que ETEC coloniza, persiste e induce respuesta inmune humoral local y sistémica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Enterotoxigenic (ETEC) and enteroaggregative Escherichia coli (EAEC) pathotypes are important etiological agents causative of diarrhea in children younger than 5 years of age in Mexico and in developing countries, where they cause numerous deaths. Both have been associated with delayed growth in children and are the main causative agents of traveler&#8217;s diarrhea. The pathogenesis of both bacteria starts by adhering to the intestinal epithelium by means of fimbriae, called colonization factors in human ETEC isolates and aggregative adherence fimbriae in EAEC isolates. Once ETEC adheres to the enterocyte, it produces one or both of its toxins and induces the secretion of chloride and sodium ions and water into the intestinal lumen, producing its characteristic watery diarrhea. EAEC binds to the intestinal epithelium forming a biofilm, induces the production of mucus, releases its toxins and promotes inflammation. EAEC and ETEC infection models with wild-type C57BL/6 and CD40 ligand-deficient mice (with intact microbiota), respectively, revealed that undernutrition and low-zinc diet increases EAEC infection, causing growth retardation, and that ETEC colonizes, persists and induces local and systemic humoral immune response.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Escherichia coli enterotoxigénica]]></kwd>
<kwd lng="es"><![CDATA[Escherichia coli enteroagregativa]]></kwd>
<kwd lng="es"><![CDATA[Diarrea infantil]]></kwd>
<kwd lng="es"><![CDATA[Desnutrición]]></kwd>
<kwd lng="es"><![CDATA[Modelos múridos]]></kwd>
<kwd lng="en"><![CDATA[Enterotoxigenic Escherichia coli]]></kwd>
<kwd lng="en"><![CDATA[Enteroaggregative Escherichia coli]]></kwd>
<kwd lng="en"><![CDATA[Diarrhea in children]]></kwd>
<kwd lng="en"><![CDATA[Undernutrition]]></kwd>
<kwd lng="en"><![CDATA[Murine models]]></kwd>
</kwd-group>
</article-meta>
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