<?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>0535-5133</journal-id>
<journal-title><![CDATA[Investigación Clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Invest. clín]]></abbrev-journal-title>
<issn>0535-5133</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Investigaciones Clínicas "Dr. Américo Negrette", Facultad de Medicina, Universidad del Zulia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0535-51332024000400426</article-id>
<article-id pub-id-type="doi">10.54817/ic.v65n4a03</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Correlations of serum 25-hydroxy-vitamin D, CD4+CD25+CD127- regulatory T cells and total immunoglobulin E in children with recurrent respiratory tract infections.]]></article-title>
<article-title xml:lang="es"><![CDATA[Las correlaciones séricas de 25-hidroxivitamina D, CD4+CD25+CD127- linfocitos T reguladores e inmunoglobulina E total en niños con infecciones recurrentes del tracto respiratorio.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yang]]></surname>
<given-names><![CDATA[Yanfei]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fan]]></surname>
<given-names><![CDATA[Na]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[Xingzhu]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Lin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Zhihai]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hou]]></surname>
<given-names><![CDATA[Yao]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Ting]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[Yuqin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Kunming Children&#8217;s Hospital Ward of Special Needs ]]></institution>
<addr-line><![CDATA[ Yunnan Province]]></addr-line>
<country>China</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>65</volume>
<numero>4</numero>
<fpage>426</fpage>
<lpage>435</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0535-51332024000400426&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0535-51332024000400426&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0535-51332024000400426&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Recurrent respiratory tract infections (RRTIs) have a complex pathogenic mechanism. There may be correlations between expression levels of serum 25-hydroxy-vitamin D (25-OH-D), regulatory T cells (Tregs), total immunoglobulin E (IgE) and RRTIs. We aimed to explore the correlations of serum 25-OH-D, cluster of differentiation 4 (CD4)+CD25+CD127- Tregs and total IgE in children with RRTIs. A total of 150 children with pneumonia were enrolled as the subjects and randomly assigned into a control group (97 children with non-RRTIs) and an observation group (53 children with RRTIs). The expression levels of serum 25-OH-D, CD4+CD25+CD127- Tregs and total IgE were compared in RRTI children with different genders, stages, sites of lesions and severities of illness. The correlation was tested by Pearson analysis. The expression level of serum 25-OH-D was significantly higher in children with RRTIs in the upper respiratory tract than that in the lower respiratory tract, whereas the expression level of total IgE was significantly lower in children with RRTIs in the upper respiratory tract (p&lt;0.05). The expression level of 25-OH-D was negatively correlated with expression levels of CD4+CD25+CD127- Tregs and total IgE (r=-0.355, -0.314, p&lt;0.05), while a positive correlation was found between expression levels of CD4+CD25+CD127- Treg and total IgE (r=0.237, p&lt;0.05). The area under the curve of combination of 25-OH-D, CD4+CD25+CD127- Treg and total IgE expression levels for predicting RRTIs was 0.852. The combined detection of the three indicators is conducive to enhancing the detection rate of RRTIs.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las infecciones recurrentes del tracto respiratorio (ITRR) tienen un mecanismo patogénico complejo. Puede haber correlaciones entre los niveles de expresión de 25-hidroxivitamina D (25-OH-D) sérica, células T reguladoras (Treg), inmunoglobulina E total (IgE) y RRTI. Nuestro objetivo fue explorar las correlaciones de la 25-OH-D sérica, el grupo de diferenciación 4 (CD4)+CD25+CD127- Tregs y la IgE total en niños con IRRR. Se inscribió un total de 150 niños con neumonía como sujetos y se los asignó aleatoriamente a un grupo de control (97 niños sin RRTI) y un grupo de observación (53 niños con RRTI). Se compararon los niveles de expresión de 25-OH-D, (CD4)+CD25+CD127- Tregs en suero y de IgE total en niños con RRTI con diferentes géneros, estadios, sitios de lesiones y gravedad de la enfermedad. La correlación fue probada mediante análisis de Pearson. El nivel de expresión de 25-OH-D sérico fue significativamente mayor en niños con IRRI en el tracto respiratorio superior que en el tracto respiratorio inferior, mientras que el nivel de expresión de IgE total fue significativamente menor en niños con IRRI en el tracto respiratorio superior (p&lt;0,05). El nivel de expresión de 25-OH-D se correlacionó negativamente con los niveles de expresión de (CD4)+CD25+CD127- Tregs y la IgE total (r=-0,355, -0,314, p&lt;0,05), mientras que se encontró una correlación positiva entre los niveles de expresión de (CD4)+CD25+CD127- Treg e IgE total (r=0,237, p&lt;0,05). El área bajo la curva de combinación de los niveles de expresión de 25-OH-D, (CD4)+CD25+CD127- Treg y de IgE total para predecir IRRI fue de 0,852. La detección combinada de los tres indicadores conduce a mejorar la tasa de detección de IRRI.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[cluster of differentiation]]></kwd>
<kwd lng="en"><![CDATA[correlation]]></kwd>
<kwd lng="en"><![CDATA[25-hydroxy-vitamin D]]></kwd>
<kwd lng="en"><![CDATA[immunoglobulin]]></kwd>
<kwd lng="en"><![CDATA[recurrent respiratory tract infection]]></kwd>
<kwd lng="en"><![CDATA[regulatory T cell]]></kwd>
<kwd lng="es"><![CDATA[cluster of differentiation]]></kwd>
<kwd lng="es"><![CDATA[correlacion]]></kwd>
<kwd lng="es"><![CDATA[25-hidroxi-vitamina D]]></kwd>
<kwd lng="es"><![CDATA[inmunoglobulina]]></kwd>
<kwd lng="es"><![CDATA[infeccion recurrente del tracto respiratorio, T cell reguladora]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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