<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282021000100004</article-id>
<article-id pub-id-type="doi">10.19136/era.a8n1.2687</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Immune and parasitological response in horses infected with gastrointestinal nematodes in the humid tropic of Mexico]]></article-title>
<article-title xml:lang="en"><![CDATA[Respuesta inmune y parasitológica de caballos infectados con nematodos gastrointestinales en el trópico húmedo de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Garduño]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maldonado-Simán]]></surname>
<given-names><![CDATA[Erna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Hernández]]></surname>
<given-names><![CDATA[Glafiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ponce-Covarrubias]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oliva-Hernández]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gives]]></surname>
<given-names><![CDATA[Pedro Mendoza-de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Unidad Regional Universitaria Sursureste ]]></institution>
<addr-line><![CDATA[Teapa Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Montecillo Edo. de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma de Guerrero Escuela Superior de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Tecpan de Galeana Guerrero]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Campo Experimental Huimanguillo ]]></institution>
<addr-line><![CDATA[Huimanguillo Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Centro Nacional de Investigación Disciplinaria en Salud Animal e Inocuidad ]]></institution>
<addr-line><![CDATA[Jiutepec Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>8</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282021000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282021000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282021000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El objetivo fue determinar la respuesta parasitológica e inmune en caballos reinfectados naturalmente con nematodos gastrointestinales (NGI) posterior a la desparasitación en el trópico húmedo de México. El estudio se realizó en Tenosique, Tabasco, México. Se utilizaron 30 caballos muestreados mensualmente durante nueve meses. Se determinó el número de huevos por gramo de heces (HPG). Se realizaron coprocultivos para obtener e identificar larvas infectivas (L3). Se obtuvieron muestras de sangre para determinar el volumen celular aglomerado (VCA), proteína plasmática (PPT) y el conteo diferencial de leucocitos (CDL). Se realizaron ensayos de inmuno absorción enzimática (ELISA) en suero para determinar los niveles de IgA contra antígenos de Ciatostómidos y de Strongylus. Los análisis consideraron la edad y el género, también se estudió la época (fría, lluviosa y seca). El número de HPG y PPT fueron más altos en las hembras (1224 ± 1269 y 7.6 ± 0.6 gdL-1, respectivamente) que en los machos (623 ± 671 y 7.4 ± 0.5 gdL-1, respectivamente), y no se observaron diferencias con la edad del animal (p &gt; 0.05). El número de HPG aumentó en la temporada de lluvias. Los principales nematodos fueron de la subfamilia Cyathostominae (97.4%) y en menor grado las especies Strongylus equinus, S. edentatus, S. vulgaris, y Oxyuris equii. La época afectó el conteo de leucocitos, neutrófilos y linfocitos, pero no eosinófilos. Las variables como el género, edad animal y las condiciones ambientales son elementos a considerar para un diagnóstico de NGI y la aplicación de tratamientos para su control.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The objective of the study was to determine the parasitological and immune response in horses naturally re-infected with gastrointestinal nematodes (GIN) after anthelmintic treatment in the humid tropic of Mexico. The study was conducted in Tenosique, Tabasco, Mexico. A total of 30 horses were sampled monthly for nine months. Fecal samples were obtained to determine the number of nematode eggs per gram (EPG) of feces. Stool cultures were performed to obtain and identify infective larvae (L3) genera. Blood samples were also obtained to determine the packed cell volume (PCV), the total plasma protein (TPP), and the differential leukocyte count (DLC). Serum enzyme-linked immunosorbent assays (ELISA) were performed to determine IgA levels against adult cyathostomins and Strongylus nematode antigen. The analyses considered the age and gender of the horses, and the season (Cold, rainy and dry). The number of EPG and TPP were higher in females (1224 ± 1269 and 7.6 ± 0.6 gdL-1, respectively) than males (623 ± 671 and 7.4 ± 0.5 gdL-1, respectively), and no differences were observed with animal age (p &gt; 0.05). The number of EPG increased in the rainy season. The main nematodes involved were of the subfamily Cyathostominae (97.4%) and to a lesser degree of species Strongylus equinus, S. edentatus, S. vulgaris, and Oxyuris equii. The season affected the leukocytes, neutrophils, and lymphocytes counts but not eosinophils. Variables such as gender, animal age, and environmental conditions are important elements for a diagnosis of GIN and the application of treatments for its control.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cyathostomins]]></kwd>
<kwd lng="en"><![CDATA[equines]]></kwd>
<kwd lng="en"><![CDATA[immunoglobulins]]></kwd>
<kwd lng="en"><![CDATA[parasites]]></kwd>
<kwd lng="en"><![CDATA[Strongylus]]></kwd>
<kwd lng="es"><![CDATA[Cyathostomidos]]></kwd>
<kwd lng="es"><![CDATA[equinos]]></kwd>
<kwd lng="es"><![CDATA[inmunoglobulinas]]></kwd>
<kwd lng="es"><![CDATA[parásitos]]></kwd>
<kwd lng="es"><![CDATA[Strongylus]]></kwd>
</kwd-group>
</article-meta>
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