<?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>2007-3380</journal-id>
<journal-title><![CDATA[Revista bio ciencias]]></journal-title>
<abbrev-journal-title><![CDATA[Revista bio ciencias]]></abbrev-journal-title>
<issn>2007-3380</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Nayarit]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-33802020000100119</article-id>
<article-id pub-id-type="doi">10.15741/revbio.07.e881</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Prevalence of Cryptosporidium spp. in dairy livestock from the Laguna region, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Prevalencia de Cryptosporidium spp. en hatos lecheros de la región lagunera, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Torres]]></surname>
<given-names><![CDATA[L. L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Cuevas]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez Vázquez]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado Gómez]]></surname>
<given-names><![CDATA[O. G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez Alvarado]]></surname>
<given-names><![CDATA[R. E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Fuentes]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chaidez Quiroz]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vidales Contreras]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[Escobedo Nuevo León]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Facultad de Agricultura y Zootecnia ]]></institution>
<addr-line><![CDATA[Gómez Palacio Durango]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro de Investigación en Alimentación y Desarrollo, A.C. Laboratorio Nacional para la Investigación en Inocuidad Alimentaria ]]></institution>
<addr-line><![CDATA[Culiacán Sinaloa]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>7</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-33802020000100119&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-33802020000100119&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-33802020000100119&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Cryptosporidiosis is a parasitic disease caused by Cryptosporidium spp. This zoonotic protozoan causes gastrointestinal infections in vertebrate animals, including human. In milk production industry, Cryptosporidium spp. causes morbidity and mortality of adult cattle and calves, and therefore, economic losses. In Mexico, the largest group of milk producers is in the Lagunar Region (LR), where gastrointestinal infections in cattle are frequent; however, the etiology is rarely known. The objective of this investigation was to determine the prevalence of Cryptosporidium spp. in 39 dairy herds of the LR. 78 stool samples were taken from the rectum of adult cattle and pre-weaned calves (39 samples from each group). Cryptosporidium spp. was recovered by sedimentation method with formalin ether and identified by microscopy and PCR, amplifying a region of Hsp 70 gene, and PCR products were sequenced and analyzed. The prevalence of Cryptosporidium spp. was determined in 71.79 % of total samples, which corresponded to 56.41 % of adults analyzed (22/39) and 87.17 % of calves (34/39). Sequences analysis showed a 100 % phylogenetic homology with Cryptosporidium parvum in all the isolates analyzed based on the alignment of Hsp70 gene. The prevalence of Cryptosporidium parvum in dairy herds of LR suggests that this is endemic and represents a risk for dairy industry and public health if manure is applied as a fertilizer in agricultural fields.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La cryptosporidiosis es una enfermedad parasitaria causada por Cryptosporidium spp. Este protozoario zoonótico causa infecciones gastrointestinales en animales vertebrados, incluyendo el hombre. En la industria de producción de leche, Cryptospodidium spp. causa morbilidad y mortalidad de bovinos adultos y terneros, y por lo tanto, pérdidas económicas. En México, el mayor grupo de productores de leche se encuentra en la Región Lagunar (LR), donde las infecciones gastrointestinales en los bovinos son frecuentes; sin embargo, pocas veces se conoce la etiología. El objetivo de esta investigación fue determinar la prevalencia de Cryptosporidium spp. en 39 hatos lecheros de la LR. Se tomaron 78 muestras de heces del recto de bovinos adultos y terneros pre-destetados (39 muestras de cada grupo). Cryptosporidium spp. se recuperó por el método de sedimentación con éter de formalina y se identificaron por microscopia y por PCR, amplificando una región del gen Hsp 70, y los productos de PCR fueron secuenciados y analizados. Se determinó una prevalencia de Cryptosporidium spp. en el 71.79 % del total de las muestras, que correspondió al 56.41 % de los adultos analizados (22/39) y al 87.17 % de los terneros (34/39). El análisis de secuencias mostró una homología filogenética del 100 % con Cryptosporidium parvum en todos los aislados analizados con base en el alineamiento del gen Hsp 70. La prevalencia de Cryptosporidium parvum en hatos lecheros de la LR sugiere que es endémico y representa un riesgo para la industria lechera y de salud pública si el estiércol es aplicado como abono en campos agrícolas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cattle]]></kwd>
<kwd lng="en"><![CDATA[dairy herds]]></kwd>
<kwd lng="en"><![CDATA[Cryptosporidium spp.]]></kwd>
<kwd lng="en"><![CDATA[Prevalence]]></kwd>
<kwd lng="en"><![CDATA[sequencing]]></kwd>
<kwd lng="es"><![CDATA[Bovinos]]></kwd>
<kwd lng="es"><![CDATA[hatos lecheros]]></kwd>
<kwd lng="es"><![CDATA[Cryptosporidium spp.]]></kwd>
<kwd lng="es"><![CDATA[prevalencia]]></kwd>
<kwd lng="es"><![CDATA[secuenciación]]></kwd>
</kwd-group>
</article-meta>
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