<?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>1812-9528</journal-id>
<journal-title><![CDATA[Memorias del Instituto de Investigaciones en Ciencias de la Salud]]></journal-title>
<abbrev-journal-title><![CDATA[Mem. Inst. Investig. Cienc. Salud]]></abbrev-journal-title>
<issn>1812-9528</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Investigaciones en Ciencias de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1812-95282023000100011</article-id>
<article-id pub-id-type="doi">10.18004/mem.iics/1812-9528/2023.e21122311</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Concordancia entre una prueba in-house de inmunofluorescencia indirecta y un test comercial de hemoaglutinación indirecta para la detección de anticuerpos anti-Trypanosoma cruzi]]></article-title>
<article-title xml:lang="en"><![CDATA[Agreement between an in-house indirect immunofluorescence assay and a commercial indirect hemagglutination test for detection of anti-Trypanosoma cruzi antibodies]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chamorro]]></surname>
<given-names><![CDATA[Luz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Giménez]]></surname>
<given-names><![CDATA[Vivian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sanabria]]></surname>
<given-names><![CDATA[Diana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Godoy]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Liuzzi]]></surname>
<given-names><![CDATA[Cinthia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carpinelli]]></surname>
<given-names><![CDATA[María Mercedes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Benegas]]></surname>
<given-names><![CDATA[Sara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Asunción Facultad de Ciencias Químicas ]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Asunción Instituto de Investigaciones en Ciencias de la Salud Departamento de Inmunología]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>21</volume>
<numero>1</numero>
<fpage>11</fpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S1812-95282023000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S1812-95282023000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S1812-95282023000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El diagnóstico serológico de la enfermedad de Chagas, causada por Trypanosoma cruzi, carece de &#8220;gold standard&#8221;, siendo considerada la inmunofluorescencia indirecta (IFI) como prueba de referencia para la detección de anticuerpos. Actualmente en Paraguay, el diagnóstico se basa en combinar dos pruebas serológicas. El objetivo del estudio fue evaluar la concordancia entre una prueba in-house de IFI y un test comercial de hemoaglutinación indirecta (HAI), para la detección de anticuerpos IgG anti-T. cruzi. Se evaluaron 54 muestras de pacientes que acudieron al Instituto de Investigaciones en Ciencias de la Salud (IICS) con solicitud médica de serología para Chagas. Los sueros fueron primeramente analizados por IFI (29 positivos y 25 negativos) y almacenados en una seroteca, posteriormente, se descongelaron para su análisis por HAI. Se determinó la concordancia entre IFI y HAI utilizando el índice Kappa. La concordancia observada entre ambos métodos fue muy buena (Índice Kappa=0,96; p(0,0001). No se observaron diferencias significativas en las frecuencias de muestras que presentaron IgG anti-T.cruzi en los niveles bajo (p=0,759), intermedio (p=1,000) y alto (p=0,592). Los anticuerpos medidos por ambos métodos mostraron buena correlación (Rho de Spearman= 0,715; p&lt;0,01). La sensibilidad y especificidad de HAI frente a IFI fue 96,6% y 100%, respectivamente. Los hallazgos sugieren que la combinación de ambas pruebas evaluadas, o bien HAI con otras pruebas serológicas, sería una buena elección diagnóstica en la enfermedad de Chagas en nuestro medio.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The serological diagnosis of Chagas disease, caused by Trypanosoma cruzi, lacks a "gold standard", being indirect immunofluorescence (IFI) considered the reference test for the detection of antibodies. Currently in Paraguay, the diagnosis is based on combining two serological tests. The objective of the study was to evaluate the agreement between an IFI in-house assay and a commercial indirect haemagglutination test (HAI) for the detection of IgG anti-T. cruzi. A total of 54 samples were evaluated, all from patients who attended the Instituto de Investigaciones en Ciencias de la Salud (IICS) with a medical request for Chagas serology. The specimens were first analyzed by IFI (29 positive and 25 negative) and stored in a serum bank, later they were thawed for analysis by HAI. Agreement between IFI and HAI was determined using the Kappa index. The agreement observed between both methods was very good (Kappa Index=0.96; p&lt;0.0001). No significant differences were observed in the frequencies of samples that presented anti-T. cruzi IgG at low (p=0.759), intermediate (p=1,000) and high (p=0.592) levels. The antibodies measured by both methods showed a good correlation (Spearman's Rho= 0.715; p&lt;0.01). The sensitivity and specificity of HAI versus IFI was 96.6% and 100%, respectively. The findings suggest that the combination of both tests, or HAI with other serological tests, would be a good diagnostic choice in Chagas disease at local level.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Enfermedad de Chagas]]></kwd>
<kwd lng="es"><![CDATA[Trypanosoma cruzi]]></kwd>
<kwd lng="es"><![CDATA[diagnóstico serológico]]></kwd>
<kwd lng="es"><![CDATA[pruebas serológicas]]></kwd>
<kwd lng="en"><![CDATA[Chagas disease]]></kwd>
<kwd lng="en"><![CDATA[Trypanosoma cruzi]]></kwd>
<kwd lng="en"><![CDATA[serological diagnosis]]></kwd>
<kwd lng="en"><![CDATA[serological tests]]></kwd>
</kwd-group>
</article-meta>
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