<?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[Biomédica]]></abbrev-journal-title>
<issn>0120-4157</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-41572018000100096</article-id>
<article-id pub-id-type="doi">10.7705/biomedica.v38i0.3653</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Detección y expresión de superantígenos y de resistencia antimicrobiana en aislamientos obtenidos de mujeres portadoras de Staphylococcus aureus que cuidan y alimentan niños]]></article-title>
<article-title xml:lang="en"><![CDATA[Detection and expression of superantigens and resistance in isolates from women carriers of Staphylococcus aureus who take care of and feed children]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guaca-González]]></surname>
<given-names><![CDATA[Yina Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flórez-Restrepo]]></surname>
<given-names><![CDATA[Gladys Fernanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moncayo-Ortiz]]></surname>
<given-names><![CDATA[José Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santacruz-Ibarra]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Aldana]]></surname>
<given-names><![CDATA[Adalucy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Tecnológica de Pereira Facultad de Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[Pereira ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Tecnológica de Pereira Centro de Biología Molecular y Biotecnología ]]></institution>
<addr-line><![CDATA[Pereira ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2018</year>
</pub-date>
<volume>38</volume>
<numero>1</numero>
<fpage>96</fpage>
<lpage>104</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-41572018000100096&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-41572018000100096&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-41572018000100096&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción. Staphylococcus aureus coloniza mucosas y piel, y causa graves infecciones en el hombre y los animales. Es importante establecer el estatus de portadoras de cepas enterotoxigénicas de este microorganismo en manipuladoras de alimentos, con el fin de prevenir intoxicaciones alimentarias.  Objetivo.  Establecer las correlaciones entre los genes de enterotoxinas clásicas, el gen tsst-1, la producción de toxinas en cultivo y la resistencia antimicrobiana en aislamientos de S. aureus provenientes de manipuladoras de alimentos que cuidan niños en sus comunidades.  Materiales y métodos.  Se cultivaron muestras de las fosas nasales y las yemas de los dedos de las manos, y se identificó S. aureus empleando las pruebas de rutina y métodos automatizados. La extracción de ADN se hizo mediante el método de bromuro de cetil-trimetil-amonio (Cetyl-Trimethyl- Ammonium Bromide, CTAB) modificado. Para la detección de superantígenos se emplearon pruebas de reacción en cadena de la polimerasa (PCR) simple y múltiple, y para la de toxinas, estuches comerciales.  Resultados.  Se encontró que el 22,0 % de los aislamientos correspondía a portadoras de S. aureus: 17,0 % en los aislamientos de fosas nasales; 5,0 % en los de las manos y 6,7 % simultáneamente en los dos sitios. La prevalencia de superantígenos fue de 73,7 %. El genotipo más frecuente fue el sea-tsst-1, con 10,0 %. La resistencia a un solo antibiótico fue de 74,7 % y, a cuatro antibióticos, de 3,2 %; de los aislamientos, el 93,7 % correspondía a cepas productoras de betalactamasas. La detección de genes clásicos y de tsst-1 mediante PCR fue de 48,4 % y la de toxinas en el sobrenadante, de 42,1 %, con una correlación de 95,7 %. Las mayores correlaciones se establecieron entre las toxinas TSST-1 (22/22) y SEA (17/18). La correlación del gen tsst-1 con la proteína y la resistencia fue de 100 %. Todos los aislamientos con el genotipo sea-tsst-1 t fueron resistentes y productores de las toxinas.  Conclusión.  La tasa de aislamientos de S. aureus toxigénicos y resistentes obtenidos de mujeres que cuidan y preparan alimentos para niños fue de más de 70 %, lo que demostró su gran virulencia y la consecuente necesidad de aplicar estrictamente las normas higiénicas y sanitarias vigentes para evitar el riesgo de intoxicación alimentaria.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: Staphylococcus aureus colonizes mucous membranes and skin causing severe infections in humans and animals. It is important to determine carrier status of enterotoxigenic strains of this microorganism in food handlers to prevent food poisoning.  Objective:  To establish the correlations among classic enterotoxigenic genes, tsst-1 gene, the production of toxins in cultures and antimicrobial resistance in S. aureus isolates from women who handle the food, feed and take care of children in their communities.  Materials and methods:  Nasal swab and finger samples were cultured and S. aureus was identified using routine methods and automated systems. DNA extraction was done by the CTAB modified method, and superantigen detection by simple and multiplex PCR, while toxins were detected using commercial kits.  Results:  We found that 22.0% of subjects were S. aureus carriers: 17.0% corresponded to nose samples, 5.0% to hands and 6.7% to both nose and hands. The prevalence of superantigens was 73.7%. The most frequent genotype was sea-tsst-1 with 10%. Resistance to one antibiotic was 74.7%, and to four antibiotics, 3.2%; 93.7% of the isolates were betalactamase-positive. Classical genes and tsst-1 gene were detected by PCR in 48.4% of samples and toxins in supernatant were detected in 42.1% of them with 95.7% of correlation.The highest correlations were established for TSST-1 and SEA with 100% and 94.4%, respectively. The correlation of tsst-1 gene with toxin production and resistance was 100%. All isolates with genotype sea-tsst-1 were toxin-positive and resistant.  Conclusion:  The rate of toxigenic and resistant S. aureus isolates from women in charge of feeding and taking care of children was higher than 70%, which demonstrates its high virulence. This requires the strict application of hygienic and sanitary regulations in order to avoid the risk of food poisoning.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Staphylococcus aureus]]></kwd>
<kwd lng="es"><![CDATA[enterotoxinas]]></kwd>
<kwd lng="es"><![CDATA[farmacorresistencia microbiana]]></kwd>
<kwd lng="es"><![CDATA[superantígenos]]></kwd>
<kwd lng="es"><![CDATA[genotipo]]></kwd>
<kwd lng="es"><![CDATA[variación genética]]></kwd>
<kwd lng="en"><![CDATA[Staphylococcus aureus]]></kwd>
<kwd lng="en"><![CDATA[enterotoxins]]></kwd>
<kwd lng="en"><![CDATA[drug resistance, microbial]]></kwd>
<kwd lng="en"><![CDATA[superantigens]]></kwd>
<kwd lng="en"><![CDATA[genotype]]></kwd>
<kwd lng="en"><![CDATA[genetic variation]]></kwd>
</kwd-group>
</article-meta>
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