<?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>0016-3813</journal-id>
<journal-title><![CDATA[Gaceta médica de México]]></journal-title>
<abbrev-journal-title><![CDATA[Gac. Méd. Méx]]></abbrev-journal-title>
<issn>0016-3813</issn>
<publisher>
<publisher-name><![CDATA[Academia Nacional de Medicina de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-38132021000500497</article-id>
<article-id pub-id-type="doi">10.24875/gmm.21000380</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la azitromicina en la producción de biopelículas y la composición de Acinetobacter baumannii resistente a múltiples fármacos]]></article-title>
<article-title xml:lang="en"><![CDATA[Azithromycin effect on multidrug-resistant Acinetobacter baumannii biofilm production and composition]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho-Ortiz]]></surname>
<given-names><![CDATA[Adrián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lara-Medrano]]></surname>
<given-names><![CDATA[Reynaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Reséndez]]></surname>
<given-names><![CDATA[Michel F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Olazarán]]></surname>
<given-names><![CDATA[Soraya]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Treviño]]></surname>
<given-names><![CDATA[Samantha]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garza-González]]></surname>
<given-names><![CDATA[Elvira]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Universitario Dr. José E. González Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Monterrey N.L]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Hospital Universitario Dr. José E. González Servicio de Gastroenterología]]></institution>
<addr-line><![CDATA[Monterrey N.L]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2021</year>
</pub-date>
<volume>157</volume>
<numero>5</numero>
<fpage>497</fpage>
<lpage>502</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-38132021000500497&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-38132021000500497&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-38132021000500497&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Objetivos: Evaluar el efecto de la azitromicina (AZM) en la formación y composición de biopelículas en Acinetobacter baumannii resistente a múltiples fármacos (MDR).  Material y métodos: Se estudiaron 96 aislamientos de A. baumannii. La susceptibilidad antimicrobiana y la concentración inhibitoria submínima (sub-MIC) se determinaron por el método de microdilución del caldo. Los genes carbapenemasa fueron detectados por reacción en cadena de la polimerasa y la diversidad clonal por electroforesis en gel de campos pulsados (PFGE). La formación de biopelículas sin AZM y la sub-MIC de AZM por tinción de cristal violeta. La composición de la biopelícula sin AZM y la sub-MIC de AZM se determinaron mediante ensayos de desprendimiento.  Resultados: Los A. baumannii seleccionados fueron MDR; el 93.8% resistentes al carbapenem y 24 OXA-24 positivos. El PFGE demostró predominancia en los clones A (53%), B (34.7%) y C (12.5%). La producción de biopelículas en sub-MIC de AZM disminuyó en un 53.1%, aumentó en un 34.7% y no mostró diferencias en un 12.5% de los aislamientos, comparado con la producción de biopelículas sin AZM.  Conclusión: La sub-MIC de AZM puede reducir la producción de biopelículas en aislamientos de A. baumannii MDR con disminución de proteínas y el ADN en la biopelícula. Nuestros resultados pueden ser útiles en estudios de sinergia para nuevas alternativas terapéuticas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objectives: To evaluate the effect of azithromycin (AZM) on biofilm formation and composition in multidrug resistant (MDR) Acinetobacter baumannii.  Material and methods: Ninety-six A. baumannii isolates were studied. Antimicrobial susceptibility and sub-minimum inhibitory concentration (sub-MIC) were determined by the broth microdilution method. Carbapenemase genes were detected by polymerase chain reaction and clonal diversity by pulsed-field gel electrophoresis (PFGE). Biofilm formation without AZM and AZM sub-MIC were determined by crystal violet staining. AZM-free biofilm composition and AZM sub-MIC were determined by detachment assays.  Results: The selected A. baumannii were MDR; 93.8 % were carbapenem-resistant and 24 were OXA-24-positive. PFGE showed predominance of clones A (53 %), B (34.7 %) and C (12.5 %). Biofilm production at AZM sub-MICs decreased in 53.1 %, increased in 34.7 % and showed no differences in 12.5 % of isolates, in comparison with biofilm production without AZM.  Conclusion: AZM sub-MIC can reduce biofilm production in A. baumannii MDR isolates with decreased protein and DNA in the biofilm. Our results may be useful in synergy studies for new therapeutic alternatives.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Acinetobacter baumannii]]></kwd>
<kwd lng="es"><![CDATA[Biopelícula]]></kwd>
<kwd lng="es"><![CDATA[Sub-MIC]]></kwd>
<kwd lng="es"><![CDATA[Composición de biopelícula]]></kwd>
<kwd lng="en"><![CDATA[Acinetobacter baumannii]]></kwd>
<kwd lng="en"><![CDATA[Biofilm]]></kwd>
<kwd lng="en"><![CDATA[Sub-MIC]]></kwd>
<kwd lng="en"><![CDATA[Biofilm composition]]></kwd>
</kwd-group>
</article-meta>
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