<?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>S2007-11242024000300584</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v15i3.6502</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Resistencia a la ivermectina en Rhipicephalus microplus (Acari: Ixodidae) en el noreste de México y factores de riesgo asociados]]></article-title>
<article-title xml:lang="en"><![CDATA[Ivermectin resistance in Rhipicephalus microplus (Acari: Ixodidae) in northeastern Mexico and associated risk factors]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Linares]]></surname>
<given-names><![CDATA[Samantha Abigail]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Ponce]]></surname>
<given-names><![CDATA[Romario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Escareño]]></surname>
<given-names><![CDATA[Jesús Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Ramírez]]></surname>
<given-names><![CDATA[Heidi Giselle]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villarreal-Villarreal]]></surname>
<given-names><![CDATA[José Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Medicina Veterinaria y Zootecnia Campus de ciencias agropecuarias]]></institution>
<addr-line><![CDATA[ Nuevo León]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[ Nuevo León]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2024</year>
</pub-date>
<volume>15</volume>
<numero>3</numero>
<fpage>584</fpage>
<lpage>601</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242024000300584&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242024000300584&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242024000300584&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Rhipicephalus microplus, es la especie parasitaria que más daño genera a la ganadería mexicana y global debido a las pérdidas directas e indirectas, como lo es el incremento de la multirresistencia y la resistencia cruzada. En la actualidad, son pocos los estudios que se tienen sobre la resistencia a lactonas macrocíclicas en México, siendo su mayoría en el sur. El presente estudio tuvo como objetivo evaluar el estado de la resistencia a ivermectina en R. microplus, en el noreste de México y factores de riesgo asociados a ésta. Se colectaron 20 poblaciones de Rhipicephalus microplus, en los estados de Veracruz, Nuevo León, Tamaulipas y San Luis Potosí, y se analizaron con la prueba de inmersión de larvas. Los datos de mortalidad se sometieron a un análisis Probit, estimándose las concentraciones letales (CL) del 50% y 99% y sus respectivos intervalos de confianza del 95% (IC95%) y para la determinación de los posibles factores de riesgo se realizó un análisis multivariado y tablas de contingencia de 2 x 2 para las variables de exposición, con un intervalo de confianza del 95%, y un modelo de regresión logística binomial para aquellas variables con una P&#8804;0.05. El 80 % de las poblaciones analizadas presentaron resistencia con rangos de RR50= 2.07-11.14 y RR99= 3.03-47.93 (P&#8804;0.05) y mediante la regresión logística binomial, se pudo observar que la variable frecuencia de tratamientos obtuvo una P &#8804;0.0134, resultado que mostró ser significativo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Rhipicephalus microplus is the parasitic species that causes the most damage to Mexican and global livestock due to direct and indirect losses, such as the increase in multidrug resistance and cross-resistance. Currently, there are few studies on resistance to macrocyclic lactones in Mexico, most of them in the south. This study aimed to evaluate the status of ivermectin resistance in R. microplus in northeastern Mexico and its associated risk factors. A total of 20 populations of Rhipicephalus microplus were collected in the states of Veracruz, Nuevo León, Tamaulipas, and San Luis Potosí, and they were analyzed with the larval immersion test. Mortality data were subjected to a Probit analysis, estimating lethal concentrations (LC) of 50 % and 99 % and their respective 95 % confidence intervals (95 % CI), and to determine possible risk factors, a multivariate analysis and 2 x 2 contingency tables were performed for the exposure variables, with a 95 % confidence interval, and a binomial logistic regression model for those variables with a P&#8804;0.05. Eighty (80) percent of the analyzed populations showed resistance with ranges of RR50= 2.07-11.14 and RR99= 3.03-47.93 (P&#8804;0.05), and through the binomial logistic regression, it was observed that the variable of frequency of treatments obtained a P&#8804;0.0134, a result that proved to be significant.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Garrapata del ganado]]></kwd>
<kwd lng="es"><![CDATA[Epidemiología veterinaria]]></kwd>
<kwd lng="es"><![CDATA[Dosis-respuesta]]></kwd>
<kwd lng="es"><![CDATA[Acaricidas]]></kwd>
<kwd lng="en"><![CDATA[Cattle tick]]></kwd>
<kwd lng="en"><![CDATA[Veterinary epidemiology]]></kwd>
<kwd lng="en"><![CDATA[Dose-response]]></kwd>
<kwd lng="en"><![CDATA[Acaricides]]></kwd>
</kwd-group>
</article-meta>
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