<?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>0034-8376</journal-id>
<journal-title><![CDATA[Revista de investigación clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. invest. clín.]]></abbrev-journal-title>
<issn>0034-8376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-83762022000400175</article-id>
<article-id pub-id-type="doi">10.24875/ric.22000159</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Significant Rise in SARS-CoV-2 Reinfection Rate in Vaccinated Hospital Workers during the Omicron Wave: A Prospective Cohort Study]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ochoa-Hein]]></surname>
<given-names><![CDATA[Eric]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leal-Morán]]></surname>
<given-names><![CDATA[Patricia E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nava-Guzmán]]></surname>
<given-names><![CDATA[Karen A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Fernández]]></surname>
<given-names><![CDATA[Abril T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Fernández]]></surname>
<given-names><![CDATA[José F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Rodríguez]]></surname>
<given-names><![CDATA[Fabricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rayas-Bernal]]></surname>
<given-names><![CDATA[Joel Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[González-González]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-González]]></surname>
<given-names><![CDATA[Pavel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Huertas-Jiménez]]></surname>
<given-names><![CDATA[Martha A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Rajme-López]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Cervantes]]></surname>
<given-names><![CDATA[Pilar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Ibarra-González]]></surname>
<given-names><![CDATA[Violeta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Andrade]]></surname>
<given-names><![CDATA[Luis A.]]></given-names>
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<xref ref-type="aff" rid="Aff"/>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Ledesma-Barrientos]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
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<xref ref-type="aff" rid="Aff"/>
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<contrib contrib-type="author">
<name>
<surname><![CDATA[Ponce-de-León]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sifuentes-Osornio]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galindo-Fraga]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán  ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>74</volume>
<numero>4</numero>
<fpage>175</fpage>
<lpage>180</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0034-83762022000400175&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0034-83762022000400175&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0034-83762022000400175&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Background: Relatively low SARS-CoV-2 reinfection rates have been reported in vaccinated individuals, but updates considering the Omicron variant are lacking.  Objective: The objective of the study was to provide a current estimate of the SARS-CoV-2 reinfection rate in a highly immunized population.  Methods: A prospective cohort of Mexican hospital workers was followed (March 2020-February 2022). Reinfection was defined as the occurrence of two or more episodes of COVID-19 separated by a period of &#8805; 90 days without symptoms. The reinfection rate was calculated as the number of reinfection episodes per 100,000 persons per day.  Results: A total of 3732 medical consultations were provided to 2700 workers, of whom 1388 (51.4%) were confirmed COVID-19 cases. A total of 73 reinfection cases were identified, of whom 71 (97.3%) had completed their primary vaccination series and 22 (30.1%) had had a booster dose before the second episode. The overall reinfection rate was 23.1 per 100,000 persons per day (as compared to a rate of 1.9 per 100,000 persons per day before the Omicron wave).  Conclusions: The SARS-CoV-2 reinfection rate rose significantly during the Omicron wave despite a high primary vaccination coverage rate. Almost one-third of reinfected workers had a vaccine booster &#8805; 14 days before the last COVID-19 episode.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[COVID-19]]></kwd>
<kwd lng="en"><![CDATA[SARS-CoV-2]]></kwd>
<kwd lng="en"><![CDATA[Reinfection]]></kwd>
<kwd lng="en"><![CDATA[Health personnel]]></kwd>
<kwd lng="en"><![CDATA[Omicron]]></kwd>
</kwd-group>
</article-meta>
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<given-names><![CDATA[PE]]></given-names>
</name>
<name>
<surname><![CDATA[Vargas-Fernández]]></surname>
<given-names><![CDATA[AT]]></given-names>
</name>
<name>
<surname><![CDATA[González-Lara]]></surname>
<given-names><![CDATA[MF]]></given-names>
</name>
<name>
<surname><![CDATA[Alberto-Hernández]]></surname>
<given-names><![CDATA[MF]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Factors associated with COVID-19 and asymptomatic carriage in healthcare workers of a COVID-19 hospital]]></article-title>
<source><![CDATA[Rev Invest Clin]]></source>
<year>2021</year>
<volume>73</volume>
<page-range>65-71</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>17.</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hernández-Bringas]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[[COVID-19 in Mexico: A Sociodemographic Profile]]]></source>
<year>2021</year>
<publisher-loc><![CDATA[Spanish: ]]></publisher-loc>
<publisher-name><![CDATA[Economic Commission for Latin America and the Caribbean]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
