<?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>0120-4157</journal-id>
<journal-title><![CDATA[Biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Biomed.]]></abbrev-journal-title>
<issn>0120-4157</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-41572021000500035</article-id>
<article-id pub-id-type="doi">10.7705/biomedica.5650</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Microscopic and molecular evaluation of Strongyloides venezuelensis in an experimental life cycle using Wistar rats]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación microscópica y molecular de Strongyloides venezuelensis en un ciclo de vida experimental utilizando ratas Wistar]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tobar]]></surname>
<given-names><![CDATA[Jairo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Sarmiento]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tayupanta]]></surname>
<given-names><![CDATA[Diana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Melina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[Fabián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigación en Salud Pública Leopoldo Izquieta Pérez  ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2021</year>
</pub-date>
<volume>41</volume>
<fpage>35</fpage>
<lpage>46</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-41572021000500035&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-41572021000500035&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-41572021000500035&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: Strongyloides venezuelensis is a nematode whose natural host is rats. It is used as a model for the investigation of human strongyloidiasis caused by S. stercoralis. The latter is a neglected tropical disease in Ecuador where there are no specific plans to mitigate this parasitic illness.  Objective: To evaluate the stages of S. venezuelensis in an experimental life cycle using Wistar rats.  Materials and methods: Male Wistar rats were used to replicate the natural biological cycle of S. venezuelensis and describe its morphometric characteristics, as well as its parasitic development. Furthermore, the production of eggs per gram of feces was quantified using two diagnostic techniques and assessment of parasite load: Kato-Katz and qPCR.  Results: Viable larval stages (Lr L2, L3) could be obtained up to 96 hours through fecal culture. Parthenogenetic females were established in the duodenum on the fifth day postinfection. Fertile eggs were observed in the intestinal tissue and fresh feces where the production peak occurred on the 8th. day post-infection. Unlike Kato-Katz, qPCR detected parasitic DNA on days not typically reported.  Conclusions: The larval migration of S. venezuelensis within the murine host in an experimental environment was equivalent to that described in its natural biological cycle. The Kato-Katz quantitative technique showed to be quick and low-cost, but the qPCR had greater diagnostic precision. This experimental life cycle can be used as a tool for the study of strongyloidiasis or other similar nematodiasis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción. Strongyloides venezuelensis es un nematodo cuyo huésped natural son las ratas. Se utiliza como modelo para la investigación de la estrongiloidiasis humana producida por S. stercoralis. Esta última es una enfermedad tropical desatendida que afecta al Ecuador, donde no existen planes específicos para mitigar esta parasitosis.  Objetivo. Evaluar experimentalmente los estadios del ciclo de vida de S. venezuelensis utilizando ratas Wistar.  Materiales y métodos. Se emplearon ratas Wistar macho para replicar el ciclo biológico natural de S. venezuelensis y describir sus características morfométricas y su desarrollo parasitario. Además, se cuantificó la producción de huevos por gramo de heces mediante dos técnicas de diagnóstico y valoración de carga parasitaria: Kato-Katz y qPCR.  Resultados. Se obtuvieron estadios larvarios viables (L1, L2, L3) hasta las 96 horas del cultivo fecal. En el duodeno se establecieron hembras partenogenéticas a partir del quinto día de la infección. Se observaron huevos fértiles en el tejido intestinal inspeccionado y en las heces frescas, en las que el pico de producción ocurrió al octavo día de la infección. A diferencia del método Kato-Katz, la qPCR detectó ADN parasitario en días que usualmente no se reportan.  Conclusiones. La migración larvaria de S. venezuelensis dentro del ratón en un ambiente experimental fue equivalente al descrito en un ciclo biológico natural. El método cuantitativo de Kato-Katz dio resultados inmediatos a más bajo costo, pero la qPCR tuvo mayor precisión diagnóstica. Este ciclo de vida experimental puede usarse como una herramienta para el estudio de la estrongiloidiasis u otras nematodiasis similares.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Strongyloides]]></kwd>
<kwd lng="en"><![CDATA[Nematoda]]></kwd>
<kwd lng="en"><![CDATA[life cycle stages]]></kwd>
<kwd lng="en"><![CDATA[intestinal diseases, parasitic]]></kwd>
<kwd lng="en"><![CDATA[Wistar rats]]></kwd>
<kwd lng="en"><![CDATA[Ecuador]]></kwd>
<kwd lng="es"><![CDATA[Strongyloides]]></kwd>
<kwd lng="es"><![CDATA[Nematoda]]></kwd>
<kwd lng="es"><![CDATA[estadios del ciclo de vida]]></kwd>
<kwd lng="es"><![CDATA[parasitosis intestinales]]></kwd>
<kwd lng="es"><![CDATA[ratas Wistar]]></kwd>
<kwd lng="es"><![CDATA[Ecuador]]></kwd>
</kwd-group>
</article-meta>
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