<?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>0120-4157</journal-id>
<journal-title><![CDATA[Biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Biomed.]]></abbrev-journal-title>
<issn>0120-4157</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-41572022000300470</article-id>
<article-id pub-id-type="doi">10.7705/biomedica.6263</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Filogenia y resistencia de cepas de Escherichia coli productoras de betalactamasas de espectro extendido a los antibióticos en pacientes con cáncer hospitalizados en Perú]]></article-title>
<article-title xml:lang="en"><![CDATA[Phylogeny and antimicrobial resistance of extended-spectrum beta-lactamase- producing Escherichia coli from hospitalized oncology patients in Perú]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Matta-Chuquisapon]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia-Bazalar]]></surname>
<given-names><![CDATA[Esther]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sevilla-Andrade]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrón-Pastor]]></surname>
<given-names><![CDATA[Helí Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Mayor de San Marcos Grupo de Investigación Resistencia a los Antimicrobianos ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Mayor de San Marcos Centro de Investigaciones Tecnológicas, Biomédicas y Medioambientales ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Mayor de San Marcos Centro de Investigación de Bioquímica y Nutrición &#8220;Alberto Guzmán Barrón&#8221; ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<volume>42</volume>
<numero>3</numero>
<fpage>470</fpage>
<lpage>478</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-41572022000300470&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-41572022000300470&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-41572022000300470&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción. Las infecciones asociadas con la atención en salud constituyen un problema de salud pública porque aumentan la morbimortalidad de los pacientes, sobre todo de aquellos con factores de riesgo, como la inmunosupresión debida a enfermedades oncológicas. Es importante conocer la diversidad genética de los principales microorganimos causantes de infecciones hospitalarias mediante la vigilancia epidemiológica tradicional y la epidemiología molecular, para hacer un mejor seguimiento y detectar brotes tempranamente.  Objetivo. Determinar el grupo filogenético y la resistencia a antibióticos de las cepas de Escherichia coli aisladas de pacientes con cáncer hospitalizados.  Materiales y métodos. Se hizo un estudio de tipo transversal que incluyó 67 cepas de Escherichia coli productoras de betalactamasas de espectro extendido (BLEE). Se determinó el grupo filogenético, el perfil de resistencia a los antibióticos, los genes de resistencia a betalactámicos, el tipo de las muestras y los servicios de hospitalización de donde fueron recuperadas.  Resultados.  El grupo filogenético más frecuente fue el B2 (36 %). El 57 % de las cepas B2 fueron aisladas de muestras de orina y el 33 % provenía del servicio de urología. La resistencia a ciprofloxacino y gentamicina fue de 91 y 53 %, respectivamente, y el 79 % de las cepas tenía el gen  bla CTX-M. Se encontró una relación significativa (p&lt;0,05) entre los grupos filogenéticos y la resistencia a ciprofloxacina, así como a la edad del paciente.  Conclusión. El filogrupo de E. coli predominante fue el B2. Se evidenció una gran resistencia a ciprofloxacina y gentamicina, una proporción elevada de cepas BLEE con el  bla CTX-M, y una relación entre el grupo filogenético y la resistencia a ciprofloxacino.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: Healthcare-associated infections are a public health problem due to the increased morbimortality of patients, especially those with risk factors such as immunosuppression due to oncological diseases. It is essential to determine the genetic diversity of the main microorganisms causing healthcare infections by combining traditional epidemiological surveillance and molecular epidemiology for better outbreak follow-up and early detection.  Objective: To determine the phylogenetic group and antibiotic resistance of Escherichia coli isolated from hospitalized oncologic patients.  Materials and methods: We conducted a cross-sectional study of 67 strains of ESBL- producing Escherichia coli to determine their phylogenetic group and described their antibiotic resistance profile, beta-lactam resistance genes, as well as the type of sample and the hospitalization areas from which they were recovered.  Results: The most frequent phylogenetic group was B2 (36%); 57% of B2 strains were isolated from urine and 33% came from the urology department. Resistance to ciprofloxacin and gentamicin was 92% and 53%, respectively, and 79% of the strains had the  bla CTX-M gene. A significant association (p&lt;0.05) was found between the phylogenetic groups, ciprofloxacin resistance, and the age of the patients.  Conclusion: The predominant E. coli phylogroup was B2. We evidenced high resistance to ciprofloxacin and gentamicin, a high proportion of ESBL strains with the  bla CTX-M gene, and a significant association between the phylogenetic group and the resistance to ciprofloxacin.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Escherichia coli]]></kwd>
<kwd lng="es"><![CDATA[filogenia]]></kwd>
<kwd lng="es"><![CDATA[resistencia a betalactámicos]]></kwd>
<kwd lng="es"><![CDATA[ciprofloxacina]]></kwd>
<kwd lng="es"><![CDATA[gentamicinas]]></kwd>
<kwd lng="en"><![CDATA[Escherichia coli]]></kwd>
<kwd lng="en"><![CDATA[phylogeny]]></kwd>
<kwd lng="en"><![CDATA[beta-lactam resistance]]></kwd>
<kwd lng="en"><![CDATA[ciprofloxacin]]></kwd>
<kwd lng="en"><![CDATA[gentamicins]]></kwd>
</kwd-group>
</article-meta>
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