<?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>0036-3634</journal-id>
<journal-title><![CDATA[Salud Pública de México]]></journal-title>
<abbrev-journal-title><![CDATA[Salud pública Méx]]></abbrev-journal-title>
<issn>0036-3634</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud Pública]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0036-36342022000300249</article-id>
<article-id pub-id-type="doi">10.21149/12930</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Seric IgG anti-SARS-CoV-2 pre- and post- Covid-19 pandemic from Mexican asymptomatic subjects]]></article-title>
<article-title xml:lang="es"><![CDATA[IgG sérica anti-SARS-CoV-2 pre y post pandemia de Covid-19 en mexicanos asintomáticos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre-Cruz]]></surname>
<given-names><![CDATA[Lucinda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán-García]]></surname>
<given-names><![CDATA[Martín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acosta-Castillo]]></surname>
<given-names><![CDATA[Isaac]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Aguilera]]></surname>
<given-names><![CDATA[Dora L de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Landero-Isidro]]></surname>
<given-names><![CDATA[Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-González]]></surname>
<given-names><![CDATA[Juana P]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Duarte]]></surname>
<given-names><![CDATA[Jaqueline]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leyva-Rendón]]></surname>
<given-names><![CDATA[Adolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez Laboratorio de Neuroinmunoendocrinología ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez Laboratorio Clínico y Banco de Sangre ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez Laboratorio de Demencias ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez Departamento de Trabajo Social ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez Clínica de Neurología General ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>64</volume>
<numero>3</numero>
<fpage>249</fpage>
<lpage>258</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0036-36342022000300249&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0036-36342022000300249&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0036-36342022000300249&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Objective:  To detect serum IgG anti-SARS-CoV-2 in pre- and post- Covid-19 pandemic in Mexican asymptomatic subjects in order to know the degree of viral dispersion.  Materials and methods:  Association of serum IgG antibodies (determined by ELISA) to sociodemographic and clinical data or contact with Covid-19 cases in three groups of subjects: 1) Covid-19 pre-pandemic blood donors (n= 538); 2) Covid-19 post-pandemic blood donors (n= 243); 3) Covid-19 post-pandemic neurological patients (n= 312). None of the subjects studied had been vaccinated.  Results:  The positive rate of IgG anti-SARS-CoV-2 was notably higher in participants recruited during the pandemic (donors, 29.6%; neurological patients, 15.7%) than in those recruited pre-pandemic (donors 0.6%) (p &lt;0.001). Other conditions associated to antibody positivity were being a worker in sales or services, or having had previous contact with people with Covid-19, for donnors and neurological patients, and having diabetes mellitus, for neurological patients. Higher positivity levels of anti-SARS-CoV-2 IgG were found in females than in males. The highest proportion of subjects with anti-SARS-CoV-2 antibodies was found in central Mexico.  Conclusions: The dispersion of SARS-CoV-2 in asymptomatic, unvaccinated subjects (donors and neurological patients) recruited in a Mexican health institution, who work in sales or services or had previously had contact with Covid-19 patients is 16 to 30%. The level of positivity for anti-SARS-CoV-2 IgG is higher in females than in males. SARS-CoV-2 antibody seroprevalence follow-up studies must be favored among the general population, being mandatory for donors.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Objetivo: Detectar IgG sérica anti-SARS-CoV-2 antes y después de la pandemia de Covid-19 en sujetos mexicanos asintomáticos, con la intención de conocer el grado de dispersión viral.  Material y métodos: Se analizó la asociación de anticuerpos IgG séricos (determinados por ELISA), datos sociodemográficos y clínicos y contacto con casos de Covid-19 en tres grupos de sujetos: 1) donadores de sangre reclutados antes de la pandemia de Covid-19 (n= 538); 2) donadores (n= 243) y 3) pacientes neurológicos (n= 312) reclutados durante la pandemia de Covid-19. Ninguno de los sujetos estudiados había sido vacunado.  Resultados:  La tasa de positividad de IgG anti-SARS-CoV-2 fue notablemente mayor en los participantes reclutados durante la pandemia (donadores, 29.6%; pacientes neurológicos, 15.7%) que en los reclutados prepandemia (donadores 0.6%). Otras condiciones asociadas con positividad de anticuerpos fueron trabajar en ventas o servicios, o haber tenido contacto previo con pacientes Covid-19, en donadores y pacientes neurológicos, y haber tenido diabetes mellitus, en pacientes neurológicos. Se encontraron mayores niveles de positividad de IgG anti-SARS-CoV-2 en mujeres que en hombres. La mayor proporción de sujetos con anticuerpos anti-SARS-CoV-2 procedía del centro de México.  Conclusiones: La dispersión del SARS-CoV-2 en sujetos asintomáticos, no vacunados (donadores y pacientes neurológicos), reclutados en una institución de salud mexicana, que trabajan en ventas o servicios, o tienen contacto previo con pacientes Covid-19 es de 16 a 30%. El nivel de positividad de IgG anti-SARS-CoV-2 es más alto en mujeres que en hombres. Los estudios de seguimiento de la seroprevalencia del SARS-CoV-2 deben favorecerse en la población general, siendo obligatorios en los donadores.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[IgG anti-SARS-CoV-2]]></kwd>
<kwd lng="en"><![CDATA[ELISA]]></kwd>
<kwd lng="en"><![CDATA[asymptomatic subjects]]></kwd>
<kwd lng="en"><![CDATA[donors]]></kwd>
<kwd lng="es"><![CDATA[IgG anti-SARS-CoV-2]]></kwd>
<kwd lng="es"><![CDATA[ELISA]]></kwd>
<kwd lng="es"><![CDATA[sujetos asintomáticos]]></kwd>
<kwd lng="es"><![CDATA[donadores]]></kwd>
</kwd-group>
</article-meta>
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