<?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>S0036-36342021000300422</article-id>
<article-id pub-id-type="doi">10.21149/11817</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[On the increasing incidence of SARSCoV-2 in older adolescents and younger adults during the epidemic in Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Sobre la incidencia creciente de SARS-CoV-2 en adolescentes mayores y adultos jóvenes durante la epidemia en México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Stern]]></surname>
<given-names><![CDATA[Dalia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lajous]]></surname>
<given-names><![CDATA[Martin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosa]]></surname>
<given-names><![CDATA[Blanca De la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Goldstein]]></surname>
<given-names><![CDATA[Edward]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Salud Pública Centro de Investigación en Salud Poblacional ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Salud Pública Centro de Investigación en Salud Poblacional ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Harvard T.H. Chan School of Public Health  Department of Global Health and Population]]></institution>
<addr-line><![CDATA[ Boston]]></addr-line>
<country>United States</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Secretaría de Salud Dirección de Información Epidemiológica ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Harvard T.H. Chan School of Public Health Department of Epidemiology Center for Communicable Disease Dynamics]]></institution>
<addr-line><![CDATA[ Boston]]></addr-line>
<country>United States</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2021</year>
</pub-date>
<volume>63</volume>
<numero>3</numero>
<fpage>422</fpage>
<lpage>428</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0036-36342021000300422&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0036-36342021000300422&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0036-36342021000300422&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objective:  To estimate temporary changes in the incidence of SARS-CoV-2-confirmed hospitalizations (by date of symptom onset) by age group during and after the national lockdown.  Materials and methods:  For each age group g, we computed the proportion E(g) of individuals in that age group among all cases aged 10-59y during the early lockdown period (April 20-May 3, 2020), and the corresponding proportion L(g) during the late lockdown (May 18-31, 2020) and post-lockdown (June 15-28, 2020) periods and computed the prevalence ratio: PR(g)=L(g)/E(g).  Results:  For the late lockdown and post-lockdown periods, the highest PR values were found in age groups 15-19y (late: PR=1.69, 95%CI 1.05,2.72; post-lockdown: PR=2.05, 1.30,3.24) and 20-24y (late: PR=1.43, 1.10,1.86; post-lockdown: PR=1.49, 1.15,1.93). These estimates were higher in individuals 15-24y compared to those &#8805;30y.  Conclusions:  Adolescents and younger adults had an increased relative incidence of SARS-CoV-2 during late lockdown and post-lockdown periods. The role of these age groups should be considered when implementing future pandemic response efforts.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Objetivo:  Estimar los cambios temporales en la incidencia de hospitalizaciones confirmadas por SARS-CoV-2 (por fecha de inicio de los síntomas) por grupo de edad durante y después del cierre nacional.  Material y métodos:  Para cada grupo de edad g, calculamos la proporción E(g) de individuos en ese grupo de edad entre todos los casos de 10 a 59 años durante el periodo de cierre temprano (del 20 de abril al 3 de mayo de 2020) y la proporción correspondiente L(g) durante los periodos de cierre tardío (18-31 de mayo de 2020) y posterior al cierre (15-28 de junio de 2020), y se calculó la razón de prevalencia: RP(g)=L(g)/E(g).  Resultados:  Para los periodos de cierre tardío y posterior al cierre, los valores de RP más altos se dieron en los grupos de edad de 15 a 19 años (tardío: RP=1.69, IC95% 1.05,2.72; después del cierre: RP=2.05, 1.30,3.24) y 20-24 años (tardío: RP=1.43, 1.10,1.86; después del cierre: RP=1.49, 1.15,1.93). Estas estimaciones fueron más altas en personas de 15 a 24 años en comparación con las de &#8805; 30 años  Conclusiones:  Los adolescentes y los adultos jóvenes tuvieron una mayor incidencia relativa de SARS-CoV-2 durante los periodos de cierre tardío y posteriores al cierre. El papel de estos grupos de edad en la transmisión de la enfermedad debe tenerse en cuenta al implementar futuros esfuerzos de respuesta a una pandemia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[SARS-CoV-2]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[age distribution]]></kwd>
<kwd lng="en"><![CDATA[incidence]]></kwd>
<kwd lng="en"><![CDATA[mitigation]]></kwd>
<kwd lng="en"><![CDATA[lockdown]]></kwd>
<kwd lng="es"><![CDATA[SARS-CoV-2]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[distribución por edad]]></kwd>
<kwd lng="es"><![CDATA[incidencia]]></kwd>
<kwd lng="es"><![CDATA[mitigación]]></kwd>
<kwd lng="es"><![CDATA[confinamiento]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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