<?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>2072-8174</journal-id>
<journal-title><![CDATA[Revista del Nacional (Itauguá)]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Nac. (Itauguá)]]></abbrev-journal-title>
<issn>2072-8174</issn>
<publisher>
<publisher-name><![CDATA[Hospital Nacional (Itauguá)]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2072-81742025000100106</article-id>
<article-id pub-id-type="doi">10.18004/rdn2025.e1700106</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización fenotípica y genotípica de carbapenemasas producidas por patógenos bacterianos gramnegativos aislados en hospitales de Paraguay (2022)]]></article-title>
<article-title xml:lang="en"><![CDATA[Phenotypic and genotypic characterization of carbapenemases produced by Gram-negative bacterial pathogens isolated in hospitals in Paraguay (2022)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Melgarejo Touchet]]></surname>
<given-names><![CDATA[Nancy Lorena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Mora]]></surname>
<given-names><![CDATA[Mario Fabián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brítez]]></surname>
<given-names><![CDATA[Cristina M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dunjo]]></surname>
<given-names><![CDATA[Pamela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kawabata]]></surname>
<given-names><![CDATA[Aníbal]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Laconich]]></surname>
<given-names><![CDATA[Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Irala]]></surname>
<given-names><![CDATA[Juan Domingo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Duarte]]></surname>
<given-names><![CDATA[Gloria Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cuevas Gorostiaga]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Marta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[Evelyn]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abreu]]></surname>
<given-names><![CDATA[Karina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Blasco Gavilán]]></surname>
<given-names><![CDATA[Raquel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portillo de Naleiro]]></surname>
<given-names><![CDATA[Rosa Estela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Viera]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jara Amarilla]]></surname>
<given-names><![CDATA[Karen Antonella]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez Sánchez]]></surname>
<given-names><![CDATA[Dolly]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pereira Martínez]]></surname>
<given-names><![CDATA[Jazmín Clarissa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[Sara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[Viviana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lesme]]></surname>
<given-names><![CDATA[Rocío Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abente]]></surname>
<given-names><![CDATA[Sonia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Goertzen]]></surname>
<given-names><![CDATA[Stefan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Busignani]]></surname>
<given-names><![CDATA[Sofia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Grupo de investigación Resistencia a los Antimicrobianos (RAM)  ]]></institution>
<addr-line><![CDATA[Asunción ]]></addr-line>
<country>Paraguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>17</volume>
<fpage>106</fpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2072-81742025000100106&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2072-81742025000100106&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2072-81742025000100106&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción: la diseminación de bacterias gramnegativas resistentes a carbapenémicos representa una causa importante de morbi-mortalidad, siendo una amenaza creciente para la salud pública y de gran preocupación en el mundo. Aunque la resistencia a carbapenémicos puede ser debida a varios mecanismos, el más relevante, clínica y epidemiológicamente, es por producción de enzimas.  Objetivos:  caracterizar fenotípica y genotípicamente carbapenemasas producidas por bacilos gramnegativos de importancia clínica aislados en hospitales de Paraguay en el año 2022 y evaluar la susceptibilidad a colistina.  Metodología: estudio multicéntrico, retrospectivo, realizado en 1226 cepas remitidas al Laboratorio Central durante el año 2022 para su caracterización fenotípica y genotípica. Fueron realizados estudios de identificación (métodos convencionales), susceptibilidad a colistina (microdilución en caldo), y de confirmación de genes de resistencia (moleculares).  Resultados: de las 1226 cepas estudiadas, 629 (51 %) correspondieron a no fermentadores (89 % Acinetobacter spp.) y 597 (49 %) a fermentadores (74 % Klebsiella pneumoniae). Las carbapenemasas confirmadas en A. baumannii fueron: OXA-23(94,9 %), NDM (3,1 %), OXA-23 + NDM (1,8 %) y OXA-23+NDM+OXA-58 (0,2 %); en K. pneumoniae: NDM (84,5 %), KPC (11,7 %), KPC+NDM (3,7 %) y NDM+OXA-48like (0,2 %); y en P. aeruginosa la prevalente fue NDM (50,9 %). La resistencia asociada a colistina, fue encontrada principalmente en K. pneumoniae (24 %).  Conclusión: en nuestro país es endémica la circulación de bacterias productoras de carbapenemasa. La coproducción de estas enzimas está confirmada. NDM es la prevalente en Enterobacterales y P. aeruginosa y OXA-23 en A. baumannii. La alta resistencia asociada a colistina en K. pneumoniae hace imperiosa la necesidad de contar con nuevos antimicrobianos más efectivos para el tratamiento de las infecciones.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: the dissemination of Gram-negative bacteria resistant to carbapenems represents an important cause of morbidity and mortality, being a growing threat to public health and of great concern worldwide. Although resistance to carbapenems can be due to several mechanisms, the most relevant, clinically and epidemiologically, is enzyme production. The goals of this study were to phenotypically and genotypically characterize carbapenemases produced by clinically important Gram-negative bacilli (GNB) isolated in hospitals in Paraguay in 2022 and evaluate the susceptibility to colistin.  Methodology:  retrospective study, carried out on 1226 GNB strains sent to the Central Laboratory during 2022 for phenotypic and genotypic characterization. Identification studies were performed out by conventional methods, susceptibility to colistin by microdilution in broth, and molecular studies for the confirmation of resistance genes.  Results: in total, of 1226 GNB isolates, 629 (51 %) were confirmed as non-carbohydrate-fermenting GNB (89 % Acinetobacter spp.) and 597 (49 %) as carbohydrate-fermenting GNB (74 % Klebsiella pneumoniae). Carbapenemases OXA-23 (94.9 %), NDM (3.1 %), OXA-23+NDM (1.8 %) and OXA-23+NDM+OXA-58 (0.2 %) were confirmed in Acinetobacter baumannii; in K. pneumoniae: NDM (84.5 %), KPC (11.7 %), KPC+NDM (3.7 %) and NDM+OXA-48like (0.2 %); and in P. aeruginosa the prevalent was NDM (50.9 %). Colistin-associated resistance was found mainly in K. pneumoniae (24%).  Conclusions: in our country the circulation of carbapenemase-producing bacteria is endemic. The co-production of these enzymes is confirmed. NDM is prevalent in Enterobacterales and P. aeruginosa, and OXA-23 in A. baumannii. The high resistance associated with colistin in K. pneumoniae makes it imperative to have new, more effective antimicrobials for the treatment of infections.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Enterobacteriaceae resistentes a carbapenémicos]]></kwd>
<kwd lng="es"><![CDATA[Acinetobacter baumannii]]></kwd>
<kwd lng="es"><![CDATA[colistina]]></kwd>
<kwd lng="es"><![CDATA[carbapenémicos]]></kwd>
<kwd lng="es"><![CDATA[Paraguay]]></kwd>
<kwd lng="en"><![CDATA[Carbapenem-Resistant Enterobacteriaceae]]></kwd>
<kwd lng="en"><![CDATA[Acinetobacter baumannii]]></kwd>
<kwd lng="en"><![CDATA[colistin]]></kwd>
<kwd lng="en"><![CDATA[carbapenems]]></kwd>
<kwd lng="en"><![CDATA[Paraguay]]></kwd>
</kwd-group>
</article-meta>
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