<?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>0375-0760</journal-id>
<journal-title><![CDATA[Revista Cubana de Medicina Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Med Trop]]></abbrev-journal-title>
<issn>0375-0760</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0375-07602020000200008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Comparación de tres métodos de concentración de enteroparásitos en muestras fecales humanas]]></article-title>
<article-title xml:lang="en"><![CDATA[Comparison between three enteroparasite concentration methods in human stool samples]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso Rosales Rimache]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bautista Manchego]]></surname>
<given-names><![CDATA[Karla Mercedes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Peruana Cayetano Heredia Facultad de Salud Pública y Administración ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Laboratorio privado Arcángel de Ica  ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Perú</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2020</year>
</pub-date>
<volume>72</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0375-07602020000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0375-07602020000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0375-07602020000200008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivo.  Comparar tres métodos de concentración de enteroparásitos en muestras fecales humanas.  Métodos.  Se diseñó un estudio transversal en el que se evaluaron 154 muestras fecales categorizadas en dos grupos: parasitados (n= 127) y no parasitados (n= 27). Las muestras fueron sometidas a tres métodos: parasitológico directo, sedimentación simple y Ritchie modificado, y a la observación microscópica en lugol y suero fisiológico a un aumento de 40X.  Resultados.  Se observó mayor frecuencia en la presencia de estructuras parasitarias por el método de Ritchie modificado (37 %), seguido de la sedimentación simple (14,8 %) en el grupo de no parasitados; mientras que en el grupo de parasitados, se observó mayor carga parasitaria obtenida por el método de Ritchie (3+ (15,8 %) y 2+ (23,6 %), que en la sedimentación simple (3+ (10,2 %) y 2+ (22,8 %). Las especies parasitarias con mayor frecuencia fueron Entamoeba coli (20,3 %), Giardia lamblia (18,8 %), Blastocystis hominis (15,9 %) y Endomlimax nana (15,2 %); además, se presentó 48,7 % casos con poliparasitismo. El área bajo la curva (AUC) para los métodos de Ritchie modificado, sedimentación simple y parasitológico directo fue de 0,870; 0.648 y 0,796, respectivamente. El AUC del método de Ritchie modificado fue mayor en los varones (0,933) que en las mujeres (0.,92); así como en aquellos menores de 12 años (0,867), comparados con personas entre 12-37 años (0,833) y 18-39 años (0,800).  Conclusiones.  El método de Ritchie modificado presenta alto rendimiento diagnóstico y permite concentrar mayor cantidad de parásitos intestinales que el método de sedimentación simple. Además, presenta la ventaja de utilizar insumos de fácil acceso y baja toxicidad, lo que genera mayor posibilidad de implementación en los laboratorios de parasitología.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Objective:  Compare three enteroparasite concentration methods in human stool samples.  Methods:  A cross-sectional study was conducted of 154 stool samples divided into two groups: with parasites (n= 127) and without parasites (n= 27). The samples were subjected to three methods: direct parasitological examination, simple sedimentation and modified Ritchie's, and to microscopic observation in lugol and saline solution to a 40x increase.  Results:  In the non-parasite group the highest frequency in the presence of parasite structures was observed with the modified Ritchie's method (37%), followed by simple sedimentation (14.8%). In the parasite group a greater parasite load was obtained by Ritchie's method (3+ (15.8%) and 2+ (23.6%) than by simple sedimentation (3+ (10.2%) and 2+ (22.8%). The parasite species showing the highest frequency were Entamoeba coli (20.3%), Giardia lamblia (18.8%), Blastocystis hominis (15.9%) and Endomlimax nana (15.2%), whereas polyparasitism was found in 48.7% of the cases. The area under the curve (AUC) for the modified Ritchie's method, simple sedimentation technique and direct parasitological examination was 0.870, 0.648 and 0.796, respectively. In the modified Ritchie's method the AUC was greater in male (0.933) than in female subjects (0.92), as well as in subjects aged under 12 years (0.867) in comparison with people aged 12-37 years (0.833) and 18-39 years (0.800).  Conclusions:  The modified Ritchie's method has a high diagnostic yield and makes it possible to concentrate a larger number of intestinal parasites than the simple sedimentation method. Additionally, it has the advantage of using inputs of easy access and low toxicity, broadening the possibility of its implementation in parasitology laboratories.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[método de Ritchie]]></kwd>
<kwd lng="es"><![CDATA[sedimentación simple]]></kwd>
<kwd lng="es"><![CDATA[parasitológico directo]]></kwd>
<kwd lng="es"><![CDATA[enteroparasitosis]]></kwd>
<kwd lng="en"><![CDATA[Ritchie's method]]></kwd>
<kwd lng="en"><![CDATA[simple sedimentation]]></kwd>
<kwd lng="en"><![CDATA[direct parasitological examination]]></kwd>
<kwd lng="en"><![CDATA[enteroparasitosis]]></kwd>
</kwd-group>
</article-meta>
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<surname><![CDATA[Pereira]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Santos]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Serra]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Juliao]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<source><![CDATA[Acta Trop]]></source>
<year>2014</year>
<volume>131</volume>
<page-range>63-70</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
