<?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>1025-028X</journal-id>
<journal-title><![CDATA[Vaccimonitor]]></journal-title>
<abbrev-journal-title><![CDATA[Vaccimonitor]]></abbrev-journal-title>
<issn>1025-028X</issn>
<publisher>
<publisher-name><![CDATA[Finlay Ediciones]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1025-028X2003000100002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Validación de un ensayo ELISA para la determinación de anticuerpos anti LPS de Vibrio Cholerae]]></article-title>
<article-title xml:lang="en"><![CDATA[Validation of an ELISA assay to determine antibodies against LPS of Vibrio Cholerae]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pino]]></surname>
<given-names><![CDATA[Yadira]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valmaseda]]></surname>
<given-names><![CDATA[Tania]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina]]></surname>
<given-names><![CDATA[Yudisey]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cedré]]></surname>
<given-names><![CDATA[Bárbara]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Año]]></surname>
<given-names><![CDATA[Gemma]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[Hilda M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Talavera]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Irma]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgado]]></surname>
<given-names><![CDATA[Ileana]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Finlay  ]]></institution>
<addr-line><![CDATA[Ciudad de La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2003</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2003</year>
</pub-date>
<volume>12</volume>
<numero>1</numero>
<fpage>11</fpage>
<lpage>17</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1025-028X2003000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1025-028X2003000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1025-028X2003000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Para evaluar la respuesta inmunológica de cualquier candidato vacunal es necesario contar en el laboratorio con técnicas estandarizadas y validadas. Es por ello que en este trabajo se realizaron los ensayos para la estandarización del ELISA indirecto, usado para la determinación de anticuerpos séricos anti-LPS Ogawa contra cólera en suero de humanos inoculados por vía oral, así como la evaluación de los parámetros de validación típicos de este ensayo. Para la selección de las condiciones óptimas se evaluaron la concentración de recubrimiento, condiciones de bloqueo y dilución de conjugado, con el objetivo de seleccionar las mejores respuestas para el control positivo, el control negativo y el blanco en cada caso.Una concentración de 25 &#956;g/mL de LPS Ogawa en PBS, como recubrimiento, durante toda la noche; leche descremada al 0,5% en PBS, 30 min a temperatura ambiente como bloqueo y el conjugado anti-IgA-HRP diluido 1:5000, resultaron las variables óptimas para el ensayo. En cuanto a la validación de la técnica los parámetros evaluados fueron precisión, exactitud, límite de detección, especificidad y robustez. Para ello se siguió un protocolo de validación que permitiera evaluarlos, y en todos los casos el ensayo se consideró adecuado, siempre y cuando el coeficiente de variación resultara ser menor del 20%. En todos los parámetros evaluados se cumplió con este requisito, considerando así los resultados confiables y reproducibles.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In order to evaluate the immunological response to any vaccine candidate, it is necessary to have standardized and validated laboratory techniques. For this reason the standardization of an indirect ELISA, used for determining serum antibodies against Ogawa LPS to cholera in sera of humans inoculated orally, was carried out; as well as the evaluation of the typical validation parameters for this assay. The optimal conditions for the coating concentration, blocking conditions and conjugate dilution were evaluated to select the best results for the positive control, the negative control and the blank. A 25 &#956;g/mL concentration of Ogawa LPS in PBS left overnight for coating, 0,5% skimmed milk in PBS during 30 min at room temperature for blocking and anti-IgA-HRP diluted 1:5000 as conjugate were found to be the optimal variants for the assay. With respect to the technique validation, the parameters evaluated were precision, exactness, detection limit, specificity and robustness. A validation protocol allowing their evaluation was carried out. In all cases the assay was considered adequate, if the variation coefficient was less than 20%. For all the parameters evaluated this requisite was fulfilled, so that the results were considered to be reliable and reproducible.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cólera]]></kwd>
<kwd lng="es"><![CDATA[ELISA]]></kwd>
<kwd lng="es"><![CDATA[estandarización]]></kwd>
<kwd lng="es"><![CDATA[validación]]></kwd>
<kwd lng="en"><![CDATA[Cholera]]></kwd>
<kwd lng="en"><![CDATA[ELISA]]></kwd>
<kwd lng="en"><![CDATA[standardization]]></kwd>
<kwd lng="en"><![CDATA[validation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana"><strong>ARTICULOS ORIGINALES</strong></font></p>     <p align="right">&nbsp;</p>     <p align="right"><font size="4" face="Verdana"><strong>Validaci&oacute;n de un ensayo ELISA para la determinaci&oacute;n de  anticuerpos anti LPS de Vibrio Cholerae.</strong></font></p>     <p align="right">&nbsp;</p>     <p align="right"><font size="3" face="Verdana">Validation of an ELISA assay to determine antibodies against LPS of Vibrio Cholerae</font><font face="Verdana">.</font></p>     <p align="left">&nbsp;</p>     <p align="left"><strong><font size="2" face="Verdana"> Yadira Pino, Tania Valmaseda, Yudisey Medina, B&aacute;rbara Cedr&eacute;, Gemma A&ntilde;o, Hilda M. Garc&iacute;a, Jos&eacute; Luis   P&eacute;rez, Arturo Talavera, Irma Gonz&aacute;lez, Ileana Delgado y Luis Garc&iacute;a</font></strong><font size="2" face="Verdana"><br />  </font></p>     <p align="left"><font size="2" face="Verdana">Instituto Finlay. Centro de Investigaci&oacute;n-Producci&oacute;n de Vacunas y Sueros. Ciudad de La Habana, Cuba.  E-mail: <a href="emailto:ypino@finlay.edu.cu">ypino@finlay.edu.cu</a></font></p> <hr />     <p align="left"><font size="2" face="Verdana"><strong>RESUMEN</strong></font></p>     <p align="justify"><font size="2" face="Verdana"> Para evaluar la respuesta inmunol&oacute;gica de cualquier candidato vacunal es necesario contar en el laboratorio   con t&eacute;cnicas estandarizadas y validadas. Es por ello que en este trabajo se realizaron los ensayos para la   estandarizaci&oacute;n del ELISA indirecto, usado para la determinaci&oacute;n de anticuerpos s&eacute;ricos anti-LPS Ogawa   contra c&oacute;lera en suero de humanos inoculados por v&iacute;a oral, as&iacute; como la evaluaci&oacute;n de los par&aacute;metros de   validaci&oacute;n t&iacute;picos de este ensayo. Para la selecci&oacute;n de las condiciones &oacute;ptimas se evaluaron la   concentraci&oacute;n de recubrimiento, condiciones de bloqueo y diluci&oacute;n de conjugado, con el objetivo de   seleccionar las mejores respuestas para el control positivo, el control negativo y el blanco en cada caso.Una concentraci&oacute;n de 25 &mu;g/mL de LPS Ogawa en PBS, como recubrimiento, durante toda la noche; leche   descremada al 0,5% en PBS, 30 min a temperatura ambiente como bloqueo y el conjugado anti-IgA-HRP   diluido 1:5000, resultaron las variables &oacute;ptimas para el ensayo. En cuanto a la validaci&oacute;n de la t&eacute;cnica los   par&aacute;metros evaluados fueron precisi&oacute;n, exactitud, l&iacute;mite de detecci&oacute;n, especificidad y robustez. Para ello se   sigui&oacute; un protocolo de validaci&oacute;n que permitiera evaluarlos, y en todos los casos el ensayo se consider&oacute;   adecuado, siempre y cuando el coeficiente de variaci&oacute;n resultara ser menor del 20%. En todos los   par&aacute;metros evaluados se cumpli&oacute; con este requisito, considerando as&iacute; los resultados confiables y   reproducibles.</font></p>     ]]></body>
<body><![CDATA[<p align="left"><font size="2" face="Verdana"> <strong>Palabras claves:</strong> C&oacute;lera, ELISA, estandarizaci&oacute;n, validaci&oacute;n</font>.</p> <hr />     <p align="justify"><font size="2" face="Verdana"><strong>ABSTRACT</strong><br />  <br />  In order to evaluate the immunological response to any vaccine candidate, it is necessary to have standardized and  validated laboratory techniques. For this reason the standardization of an indirect ELISA, used for determining serum  antibodies against Ogawa LPS to cholera in sera of humans inoculated orally, was carried out; as well as the  evaluation of the typical validation parameters for this assay. The optimal conditions for the coating concentration, blocking conditions and conjugate dilution were evaluated to select the best results for the positive control, the  negative control and the blank. A 25 &mu;g/mL concentration of Ogawa LPS in PBS left overnight for coating, 0,5%   skimmed milk in PBS during 30 min at room temperature for blocking and anti-IgA-HRP diluted 1:5000 as conjugate   were found to be the optimal variants for the assay. With respect to the technique validation, the parameters   evaluated were precision, exactness, detection limit, specificity and robustness. A validation protocol allowing their   evaluation was carried out. In all cases the assay was considered adequate, if the variation coefficient was less   than 20%. For all the parameters evaluated this requisite was fulfilled, so that the results were considered to be  reliable and reproducible.</font></p>     <p align="left"><font size="2" face="Verdana"><br />   <strong>Keywords:</strong> Cholera, ELISA, standardization, validation.</font></p> <hr />     <p align="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Texto completo formato PDF </font></p>     <p align="justify" class="Estilo4 Estilo15"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>REFERENCIAS</strong></font></p>     <!-- ref --><p align="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1.Organizaci&oacute;n Mundial de la Salud. Reuni&oacute;n sobre la vacuna contra c&oacute;lera. Informe Final. Washington, D.C. 1991 </font><!-- ref --><p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">2. Ben&iacute;tez JA, Garc&iacute;a A, Silva A, Garc&iacute;a H, Fando R, Cedr&eacute; B, et al. Preliminary assessment of the safety and inmunogenicity of a new CTX&Ouml;-negative, hemagglutinin/protease-defective El Tor strain as a cholera vaccine candidate.Infection and Immunity. 1999; 67:539-545. </font><!-- ref --><p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">3.Svennerholm AM, Sack DA, Holmgren J. y Bardhan PK. Intestinal antibody responses after immunization with cholera B subunit.Lancet. 1982:305-308. </font><!-- ref --><p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">4.Cedr&eacute; B, Garc&iacute;a H, Garc&iacute;a L. y Talavera A. Estandarizaci&oacute;n y Evaluaci&oacute;n del Ensayo Vibriocida modificado.Revista Cubana de Medicina Tropical. 1999; 51(3):156-159. </font><!-- ref --><p align="justify"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">5.Organizaci&oacute;n Mundial de la Salud. Comit&eacute; de Expertos de la OMS en Especificaciones para las preparaciones farmac&eacute;uticas. 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