<?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>S0375-07602012000200002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diagnóstico de la leishmaniasis: de la observación microscópica del parásito a la detección del ADN]]></article-title>
<article-title xml:lang="en"><![CDATA[Leishmaniasis diagnosis: going from microscopic observation of parasite to DNA detection]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montalvo]]></surname>
<given-names><![CDATA[Ana M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fraga]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monzote]]></surname>
<given-names><![CDATA[Lianet]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[Marley]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fonseca]]></surname>
<given-names><![CDATA[Lisset]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto de Medicina Tropical Pedro Kourí  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2012</year>
</pub-date>
<volume>64</volume>
<numero>2</numero>
<fpage>108</fpage>
<lpage>131</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0375-07602012000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0375-07602012000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0375-07602012000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción: la leishmaniasis es una enfermedad causada por varias especies del género Leishmania, de la cual se han incrementado los reportes en los últimos años. Diversos factores genéticos, inmunológicos y asociados al parásito determinan el establecimiento de la infección y la ocurrencia de enfermedad, que se presenta en formas clínicas muy diversas, lo cual condiciona, entre otros elementos, el método diagnóstico que se aplica. Métodos: se hizo una revisión de la literatura básica y actualizada sobre aspectos generales de la leishmaniasis: la enfermedad y su situación epidemiológica, el ciclo de vida y la transmisión, vectores, presentaciones clínicas y diagnóstico; este último acápite contiene información sobre los principales métodos que se utilizan en el presente. Se puntualizó en la forma en que se apoya el diagnóstico desde el grupo de Leishmania del Instituto de Medicina Tropical "Pedro Kourí", que constituye el centro nacional de referencia para esta enfermedad tropical. Resultados: se muestra información actualizada sobre los temas escogidos, con un enfoque orientador y práctico, dirigido al personal de salud que debe enfrentar casos con sospecha de leishmaniasis. Se muestran tablas y gráficos que resumen de manera organizada aspectos relevantes, así como el algoritmo de trabajo que se sigue en el instituto con relación al diagnóstico de esta enfermedad, con énfasis especial en las aplicaciones al diagnóstico molecular que ha realizado el grupo de trabajo. Conclusiones: debido a que la leishmaniasis permanece aún sin control, el diagnóstico oportuno continúa siendo una necesidad. Todos los métodos aportan información de utilidad para la toma de decisiones en el tratamiento clínico, la imposición del tratamiento y el enfoque epidemiológico de esta parasitosis. Entre ellos, proponemos un algoritmo de trabajo en nuestro laboratorio, con el empleo de los métodos que resultan más útiles de acuerdo a nuestras condiciones y experiencias.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction: leishmaniasis is a disease caused by several species from Leishmania genus, which has been increasingly reported in the last few years. Several genetic, immunological factors and others related to this parasite have been associated to the outcome of the infection, and the occurrence of illness in varied clinical forms. All the aforementioned has an impact on the diagnostic method that should be used. Methods: a basic and recent literature review was made, mainly focused on general aspects of leishmaniasis as epidemiological situation of disease, life cycle and transmission, vectors, clinical presentation and diagnosis; the latter shows information about the main methods used at present. The procedure followed by the Leishmania group at "Pedro Kourí" Institute of Tropical Medicine to support the diagnostic activities was presented as well. Results: updated practical information about the chosen topics was presented, with a practical guiding approach aimed at the health personnel that must face suspected leishmaniasis cases. Tables and figures summarized relevant aspects in an organized form, as well as the working algorithm of Institute concerning diagnosis was presented. The application of molecular diagnosis by this working team was particularly underlined. Conclusions: as leishmaniasis is still out of control, opportune diagnosis remains a must. All the methods provide useful information for taking decisions on clinical management, treatment and epidemiology of this parasitosis; hence, a working algorithm was submitted in our lab based on the most useful methods under our present conditions and experience.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Leishmania]]></kwd>
<kwd lng="es"><![CDATA[leishmaniasis]]></kwd>
<kwd lng="es"><![CDATA[diagnóstico]]></kwd>
<kwd lng="es"><![CDATA[algoritmo]]></kwd>
<kwd lng="en"><![CDATA[Leishmania]]></kwd>
<kwd lng="en"><![CDATA[leishmaniasis]]></kwd>
<kwd lng="en"><![CDATA[diagnosis]]></kwd>
<kwd lng="en"><![CDATA[algorithm]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div align="right">       <p><font face="Verdana" size="2"><B>ART&Iacute;CULO DE REVISI&Oacute;N</B> </font></p>       <p>&nbsp; </p> </div>     <P>      <P><b><font face="Verdana" size="4">Diagn&oacute;stico de la leishmaniasis: de    la observaci&oacute;n microsc&oacute;pica del par&aacute;sito a la detecci&oacute;n    del ADN</font></b>     <P>&nbsp;      <P><font face="Verdana" size="2"><B><font size="3">Leishmaniasis diagnosis: going    from microscopic observation of parasite to DNA detection</font></B></font>     <P>&nbsp;     <P>&nbsp;      <P>      ]]></body>
<body><![CDATA[<P><b><font face="Verdana" size="2">Dr. C. Ana M. Montalvo, MSc. Jorge Fraga,    Dr. C. Lianet Monzote, MSc. Marley Garc&iacute;a, MSc. Lisset Fonseca</font></b>      <P><font face="Verdana" size="2">Instituto de Medicina Tropical &quot;Pedro Kour&iacute;&quot;.    La Habana, Cuba.</font>     <P>&nbsp;     <P>&nbsp;  <hr size="1" noshade> <font face="Verdana" size="2"><B>RESUMEN</B></font>      <p><font face="Verdana" size="2"><B>Introducci&oacute;n</b>: la leishmaniasis    es una enfermedad causada por varias especies del g&eacute;nero <I>Leishmania</I>,    de la cual se han incrementado los reportes en los &uacute;ltimos a&ntilde;os.    Diversos factores gen&eacute;ticos, inmunol&oacute;gicos y asociados al par&aacute;sito    determinan el establecimiento de la infecci&oacute;n y la ocurrencia de enfermedad,    que se presenta en formas cl&iacute;nicas muy diversas, lo cual condiciona,    entre otros elementos, el m&eacute;todo diagn&oacute;stico que se aplica.<B>        <br>   M&eacute;todos</B>: se hizo una revisi&oacute;n de la literatura b&aacute;sica    y actualizada sobre aspectos generales de la leishmaniasis: la enfermedad y    su situaci&oacute;n epidemiol&oacute;gica, el ciclo de vida y la transmisi&oacute;n,    vectores, presentaciones cl&iacute;nicas y diagn&oacute;stico; este &uacute;ltimo    ac&aacute;pite contiene informaci&oacute;n sobre los principales m&eacute;todos    que se utilizan en el presente. Se puntualiz&oacute; en la forma en que se apoya    el diagn&oacute;stico desde el grupo de Leishmania del Instituto de Medicina    Tropical &quot;Pedro Kour&iacute;&quot;, que constituye el centro nacional de    referencia para esta enfermedad tropical. <B>    <br>   Resultados</B>: se muestra informaci&oacute;n actualizada sobre los temas escogidos,    con un enfoque orientador y pr&aacute;ctico, dirigido al personal de salud que    debe enfrentar casos con sospecha de leishmaniasis. Se muestran tablas y gr&aacute;ficos    que resumen de manera organizada aspectos relevantes, as&iacute; como el algoritmo    de trabajo que se sigue en el instituto con relaci&oacute;n al diagn&oacute;stico    de esta enfermedad, con &eacute;nfasis especial en las aplicaciones al diagn&oacute;stico    molecular que ha realizado el grupo de trabajo. <B>    <br>   Conclusiones</B>: debido a que la leishmaniasis permanece a&uacute;n sin control,    el diagn&oacute;stico oportuno contin&uacute;a siendo una necesidad. Todos los    m&eacute;todos aportan informaci&oacute;n de utilidad para la toma de decisiones    en el tratamiento cl&iacute;nico, la imposici&oacute;n del tratamiento y el    enfoque epidemiol&oacute;gico de esta parasitosis. Entre ellos, proponemos un    algoritmo de trabajo en nuestro laboratorio, con el empleo de los m&eacute;todos    que resultan m&aacute;s &uacute;tiles de acuerdo a nuestras condiciones y experiencias.    </font> </p>     <P>      <P><font face="Verdana" size="2"><B>Palabras clave</B>: <I>Leishmania</I>, leishmaniasis,    diagn&oacute;stico, algoritmo. </font> <hr size="1" noshade> <font face="Verdana" size="2"><B>ABSTRACT </B></font>      ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2"><B>Introduction</b>: leishmaniasis is a disease    caused by several species from <I>Leishmania</I> genus, which has been increasingly    reported in the last few years. Several genetic, immunological factors and others    related to this parasite have been associated to the outcome of the infection,    and the occurrence of illness in varied clinical forms. All the aforementioned    has an impact on the diagnostic method that should be used. <B>    <br>   Methods</B>: a basic and recent literature review was made, mainly focused on    general aspects of leishmaniasis as epidemiological situation of disease, life    cycle and transmission, vectors, clinical presentation and diagnosis; the latter    shows information about the main methods used at present. The procedure followed    by the Leishmania group at &quot;Pedro Kour&iacute;&quot; Institute of Tropical    Medicine to support the diagnostic activities was presented as well. <B>    <br>   Results</B>: updated practical information about the chosen topics was presented,    with a practical guiding approach aimed at the health personnel that must face    suspected leishmaniasis cases. Tables and figures summarized relevant aspects    in an organized form, as well as the working algorithm of Institute concerning    diagnosis was presented. The application of molecular diagnosis by this working    team was particularly underlined. <B>    <br>   Conclusions</B>: as leishmaniasis is still out of control, opportune diagnosis    remains a must. All the methods provide useful information for taking decisions    on clinical management, treatment and epidemiology of this parasitosis; hence,    a working algorithm was submitted in our lab based on the most useful methods    under our present conditions and experience. </font>      <P>      <P><font face="Verdana" size="2"><B>Key words</B>: <I>Leishmania</I>, leishmaniasis,    diagnosis, algorithm. </font> <hr size="1" noshade>     <p>&nbsp;</p>     <P>&nbsp;      <P>      <P><font face="Verdana" size="3"><B>LA ENFERMEDAD Y SU SITUACI&Oacute;N EPIDEMIOL&Oacute;GICA    ACTUAL</B> </font>      ]]></body>
<body><![CDATA[<P>      <P><font face="Verdana" size="2">La leishmaniasis es una enfermedad causada por    protozoos par&aacute;sitos del g&eacute;nero <I>Leishmania</I> y se caracteriza    por presentar una variedad cl&iacute;nica y epidemiol&oacute;gica en relaci&oacute;n    con las especies involucradas en la infecci&oacute;n, los vectores transmisores,    as&iacute; como factores ligados al hospedero.<SUP>1,2</SUP> </font>     <P><font face="Verdana" size="2">Alrededor de 20 especies son pat&oacute;genas    para el hombre, las cuales se distribuyen en distintas regiones del Viejo y    el Nuevo Mundo (<a href="#tab1">tabla 1</a>). Seg&uacute;n la Organizaci&oacute;n    Mundial de la Salud, la enfermedad es end&eacute;mica en 88 pa&iacute;ses de    4 continentes y se notifican alrededor de 2 millones de casos nuevos cada a&ntilde;o    (<a href="http://www.who.int/leishmaniasis/burden/magnitude/burden_magnitude/" target="_blank">http://www.who.int/leishmaniasis/burden/magnitude/burden_magnitude/</a>).    Algunos autores indican que el n&uacute;mero global de casos se increment&oacute;,    particularmente en Brasil,<SUP>3</SUP> Bolivia, Per&uacute;,<SUP>4</SUP> Colombia,<SUP>5</SUP>    y Afganist&aacute;n.<SUP>6</SUP> Tal incremento puede ser el resultado del inadecuado    control de vectores y reservorios en las zonas end&eacute;micas, de la mayor    detecci&oacute;n de leishmaniasis cut&aacute;nea asociada a infecciones oportunistas    (VIH/sida),<SUP>7</SUP> de la emergencia en la resistencia al tratamiento<SUP>8    </SUP>y del impacto reciente de los cambios clim&aacute;ticos, que inciden en    la distribuci&oacute;n y el comportamiento de los vectores implicados en la    transmisi&oacute;n de distintas enfermedades, entre estas, la leishmaniasis.<SUP>9</SUP>    </font>      <P align="center">&nbsp;     <p class=MsoNormal align=center style=' text-align:center;line-height:normal'><b><span lang=IT style='font-size:10.0pt; font-family:Verdana'>Tabla 1.</span></b><span lang=IT style='font-size:10.0pt; font-family:Verdana'> Principales especies patógenas para el homb</span><span style='font-size:10.0pt;font-family:Verdana'>re y su distribución geográfica<a name="tab1"></a></span></p> <table class=MsoTableWeb1 border=1 cellspacing=3 cellpadding=0 width="580" align="center">   <tr style='height:17.7pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:17.7pt'>            <p class=MsoNormal style='line-height:   normal'><span style='font-size:10.0pt;font-family:Verdana'>Género</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:17.7pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Complejo</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:17.7pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Especie</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:17.7pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Distribución geográfica</span></p>     </td>   </tr>   <tr>      <td rowspan=10 style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal style='line-height:   normal'><i><span style='font-size:10.0pt;font-family:Verdana'>Leishmania</span></i><span   style='font-size:10.0pt;font-family:Verdana'> (<i>Leishmania</i>)</span></p>     </td>     <td rowspan=4 style='padding:0cm 5.4pt 0cm 5.4pt'>            ]]></body>
<body><![CDATA[<p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania donovani</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania donovani</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>China, subcontinente indio, Etiopía, Sudán, Kenya, Irán,          Arabia Saudita, Yemen</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania infantum</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Albania, Argelia, Francia, Grecia, Italia, Marruecos, Portugal,          España, Siria, Túnez, Turquía, Yemen</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania chagasi</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Argentina, Bolivia, Brasil, Colombia, Ecuador, El Salvador,          Guadalupe, Guatemala, Honduras, Martinica, México, Nicaragua, Paraguay,          Surinam, Venezuela</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania archibaldi</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>India, Sudán, Etiopía, Líbano, Israel</span></p>     </td>   </tr>   <tr>      <td rowspan=3 style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania tropica</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            ]]></body>
<body><![CDATA[<p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania tropica</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Afganistán, Argelia, Azerbaiyán, Grecia, Irán, Irak, Israel,          Marruecos, Túnez, Turquía, Yemen</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania aethiopica</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Etiopía, Kenya</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania major</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Afganistán, Argelia, Chad, Irán, Irak, Israel, Libia, Mauritania,          Marruecos, Siria, Sudán</span></p>     </td>   </tr>   <tr>      <td rowspan=3 style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania mexicana</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania mexicana</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Belice, Colombia, Costa Rica, República Dominicana, Ecuador,          Guatemala, Honduras, México, Panamá, Venezuela</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania amazonensis</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            ]]></body>
<body><![CDATA[<p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Bolivia, Brasil, Colombia, Costa Rica, Ecuador, Guayana          Francesa, Panamá, Perú, Venezuela</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania garnhami</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Venezuela</span></p>     </td>   </tr>   <tr>      <td rowspan=6 style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal style='line-height:   normal'><i><span style='font-size:10.0pt;font-family:Verdana'>Leishmania</span></i><span   style='font-size:10.0pt;font-family:Verdana'> (<i>Viannia</i>) </span></p>     </td>     <td rowspan=3 style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania guyanensis</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania guyanensis</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Brasil, Colombia, Ecuador, Guayana Francesa, Perú, Surinam,          Venezuela</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania panamensis</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Belice, Colombia, Costa Rica, Ecuador, Honduras, Nicaragua,          Panamá, Venezuela</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania naiffi</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            ]]></body>
<body><![CDATA[<p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Brasil, Guayana Francesa, Ecuador, Perú</span></p>     </td>   </tr>   <tr>      <td rowspan=3 style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania braziliensis</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania braziliensis</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Argentina, Belice, Bolivia, Brasil, Colombia, Costa Rica,</span></p>           <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Ecuador, Guatemala, Honduras, Nicaragua</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania peruviana</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Perú</span></p>     </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania lainsoni</span></i></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Brasil, Bolivia, Perú</span></p>     </td>   </tr> </table>     <p class=MsoNormal align=center style=' text-align:center;line-height:normal'><span style='font-size:10.0pt;font-family: Verdana'>Adaptado de Antinori <i>y otros</i>, 2012.</span></p> <span style='font-size:10.0pt;font-family:Verdana'><br clear=all style='page-break-before:always'> </span>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">De los casos de infecci&oacute;n cut&aacute;nea    90 % ocurre en Afganist&aacute;n, Pakist&aacute;n, Argelia, Ir&aacute;n, Brasil    y Per&uacute;, mientras que 90% de la enfermedad visceral ocurre en la India,    Bangladesh, Nepal, Sud&aacute;n y Brasil,<SUP>10</SUP> lo cual confirma que    esta enfermedad tiene fuertes v&iacute;nculos con la pobreza<SUP>11</SUP> y    dificulta a&uacute;n m&aacute;s su control. </font>      <P>&nbsp;      <P>      <P><font face="Verdana" size="2"><B><font size="3">ASPECTOS GENERALES DEL CICLO    DE VIDA Y LA TRANSMISI&Oacute;N</font></B> </font>      <P>      <P><font face="Verdana" size="2">La forma infectiva del par&aacute;sito es el    promastigote metac&iacute;clico,<SUP>12</SUP> que se inocula en el mam&iacute;fero    mediante la picadura del insecto, y cuya transmisi&oacute;n constituye un ejemplo    t&iacute;pico de antropozoonosis (<a href="#fig1">Fig. 1</a>). Por otra parte,    aspectos relacionados con la conducta humana, como la urbanizaci&oacute;n y    destrucci&oacute;n de los bosques,<SUP>13</SUP> la ocurrencia de conflictos    armados,<SUP>14</SUP> y el incremento del turismo, provocan la migraci&oacute;n    de poblaci&oacute;n susceptible hacia &aacute;reas end&eacute;micas y favorecen    la dispersi&oacute;n de <I>Leishmania</I>.<SUP>15</SUP> </font>     <P>&nbsp;      <P>      <P>      <P>      ]]></body>
<body><![CDATA[<P align="center"><img src="/img/revistas/mtr/v64n2/f0102112.jpg" width="580" height="460"><a name="fig1"></a>      <P><font face="Verdana" size="2">Es muy probable que como consecuencia del calentamiento    global la leishmaniasis se disperse hacia zonas actualmente templadas, donde    los incrementos de la temperatura pudieran favorecer la extensi&oacute;n de    las estaciones en las cuales se alimentan los vectores que transmiten el par&aacute;sito,    o que la baja temperatura provoque una extensi&oacute;n de su per&iacute;odo    larval<SUP>16</SUP>. Tambi&eacute;n eventos naturales que en los &uacute;ltimos    a&ntilde;os se han hecho cada vez m&aacute;s frecuentes, como los terremotos,    han provocado nuevos focos de la enfermedad en &aacute;reas que, con anterioridad,    permanec&iacute;an libres de esta infecci&oacute;n<SUP>17</SUP>. </font>      <P><font face="Verdana" size="2">Adem&aacute;s de la transmisi&oacute;n natural,    es importante conocer que existe transmisi&oacute;n del par&aacute;sito a partir    de personas infectadas con <I>Leishmania</I> que utilizan drogas endovenosas,    cuando existe uso de jeringuillas compartidas, lo que ha conllevado a la coinfecci&oacute;n    <I>Leishmania</I>-HIV. De forma general, se acepta que la incidencia global    reportada para esta coinfecci&oacute;n est&aacute; subestimada, debido en parte    a que la forma visceral de la enfermedad ocurre en &quot;poblaciones olvidadas&quot;    y tambi&eacute;n al hecho de que al no estar la leishmaniasis dentro de la lista    de enfermedades oportunistas, esta coinfecci&oacute;n se notifica raramente.<SUP>18</SUP>    </font>     <P>&nbsp;      <P>      <P><font face="Verdana" size="3"><B>VECTORES </B> </font>      <P>      <P><font face="Verdana" size="2">Los vectores de todas las especies de <I>Leishmania</I>    descritas son hembras hemat&oacute;fagas de la familia Psychodidae, subfamilia    Phlebotominae y de las 500 especies conocidas, solo 31 se identifican como vectores    de especies pat&oacute;genas y 43 como vectores probables, pertenecientes a    los g&eacute;neros <I>Phlebotomus</I> en el Viejo Mundo y <I>Lutzomyia</I> en    el Nuevo Mundo<SUP>19</SUP>. </font>     <P><font face="Verdana" size="2">En Cuba no se reconocen vectores transmisores    de <I>Leishmania</I>. En 1920 se describi&oacute; para Cuba y las Islas Caim&aacute;n    la presencia de 2 especies de <I>Lutzomyia</I>: <I>Lu. cubensis</I> y <I>Lu.    orestes</I><SUP>20</SUP>. En la d&eacute;cada de los 80 se notificaron 2 especies    y una nueva subespecie del g&eacute;nero para Cuba: (<I>Lu. novoae y Lu. diazi</I>)<I>    </I>y (<I>Lu. cayennensis cruz</I>); solo <I>Lu. orestes,</I> entre todas, es    la que manifiesta h&aacute;bitos antropof&iacute;licos y hemat&oacute;fagos.    Al mismo tiempo, se realiz&oacute; la caracterizaci&oacute;n biol&oacute;gica    y ecol&oacute;gica de estos vectores, y se notific&oacute; su distribuci&oacute;n    en todas las regiones de la geograf&iacute;a cubana <SUP>21</SUP>. </font>     <P><font face="Verdana" size="2">Contrario a lo que sucede en Am&eacute;rica Latina,    donde la mayor actividad de los fleb&oacute;tomos es nocturna, <I>Lu. orestes</I>    tiene h&aacute;bitos diurnos con<B><FONT COLOR="#ccff66"> </FONT></B>picos de    actividad hematof&aacute;gica que se relacionan con cambios en la temperatura,    humedad y luminosidad; y tal como ocurre en otros casos, el ataque de las hembras    se produce en oleadas,<SUP>22</SUP> lo cual amplifica, te&oacute;ricamente,    su potencialidad vectorial. En a&ntilde;os posteriores, se desarrollaron estudios    encaminados a demostrar las posibilidades de transmisi&oacute;n experimental    de <I>Leishmania </I> mediante este vector, utilizando como modelo el h&aacute;mster    dorado.<SUP>23</SUP> </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">En la actualidad, ser&iacute;a imprescindible    demostrar que <I>Lu. orestes</I> cumple los requisitos indispensables propuestos    por Killick-Kendrick (1990), para poder considerarse como vector de <I>Leishmania</I>,    y plantear, de manera fehaciente, que existen en Cuba posibilidades de transmisi&oacute;n    de este par&aacute;sito. No existen investigaciones recientes que aporten claridad    sobre aspectos relativos a la posible transmisi&oacute;n en el pa&iacute;s.    Sin embargo, es necesario conocer los datos antes mencionados, porque no se    puede descartar por completo la posibilidad de que bajo condiciones epidemiol&oacute;gicas    espec&iacute;ficas, en las que se presenten todos los elementos que componen    la cadena epidemiol&oacute;gica de transmisi&oacute;n, se pueda producir este    fen&oacute;meno que deber&iacute;a demostrarse rigurosamente. </font>      <P>&nbsp;     <P><font face="Verdana" size="2"><B><font size="3">PRESENTACIONES CL&Iacute;NICAS</font></B>    </font>      <P><font face="Verdana" size="2">En la leishmaniasis la presentaci&oacute;n cl&iacute;nica    es variada y depende por lo general de varios factores, entre los cuales la    susceptibilidad gen&eacute;tica del hospedero,<SUP>24</SUP> el contexto inmunol&oacute;gico    en que se produce la infecci&oacute;n<SUP>25</SUP> y la especie de <I>Leishmania</I>    infectante<SUP>26</SUP> son los m&aacute;s importantes. As&iacute;, se pueden    presentar de manera general, la leishmaniasis cut&aacute;nea, mucocut&aacute;nea    y visceral, con caracter&iacute;sticas cl&iacute;nicas espec&iacute;ficas que    aparecen descritas en un art&iacute;culo reciente,<SUP>27</SUP> por lo cual    no se har&aacute; extensi&oacute;n en este aspecto. En varios pa&iacute;ses    tambi&eacute;n se notifican otras presentaciones cl&iacute;nicas intermedias    o at&iacute;picas.<SUP>28</SUP> </font>     <P>&nbsp;     <P>      <P><font face="Verdana" size="2"><B><font size="3">DIAGN&Oacute;STICO DE LA LEISHMANIASIS</font></B>    </font>      <P><font face="Verdana" size="2">El diagn&oacute;stico por lo general depende    de la forma cl&iacute;nica de presentaci&oacute;n y de las posibilidades tecnol&oacute;gicas    existentes en el servicio m&eacute;dico que recibe al paciente. Una vez que    se presenta un paciente con las caracter&iacute;tiscas cl&iacute;nicas o epidemiol&oacute;gicas    que hagan sospechar una leishmaniasis, pueden realizarse una serie de ex&aacute;menes    que se describir&aacute;n m&aacute;s adelante, en relaci&oacute;n con la forma    de presentaci&oacute;n de la enfermedad. </font>      <P><font face="Verdana" size="2"><B>Aspectos cl&iacute;nicos &uacute;tiles para    la orientaci&oacute;n del diagn&oacute;stico de las leishmaniasis </B> </font>      <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Al existir diversas formas de presentaci&oacute;n    de la leishmaniasis cut&aacute;nea y mucocut&aacute;nea, los aspectos cl&iacute;nicos    que pudieran hacer pensar en la presencia de alguna de estas son diversos, raz&oacute;n    por la cual se comentar&aacute;n m&aacute;s adelante. De manera general, la    evoluci&oacute;n de la lesi&oacute;n inicial en el sitio de la picada del vector    es similar. Tras un per&iacute;odo de incubaci&oacute;n de 2 semanas a 3 meses    aparece una p&aacute;pula o n&oacute;dulo peque&ntilde;o, que puede acompa&ntilde;arse    de inflamaci&oacute;n ganglionar, y a veces cura de manera espont&aacute;nea.    En otras ocasiones, la lesi&oacute;n evoluciona hacia una enfermedad de diversas    caracter&iacute;sticas cl&iacute;nicas,<SUP>29</SUP> algunas de las cuales se    describir&aacute;n a continuaci&oacute;n tomando en cuenta el &aacute;rea geogr&aacute;fica    de origen. </font>     <P><font face="Verdana" size="2">En el Nuevo Mundo abundan las especies dermotr&oacute;picas,    que producen manifestaciones m&aacute;s variadas que en el Viejo Mundo. Se puede    presentar una lesi&oacute;n solitaria, o lesiones m&uacute;ltiples, en sitios    cercanos a la picada del vector o en &aacute;reas distantes del cuerpo. La leishmaniasis    cut&aacute;nea localizada, que es la forma m&aacute;s com&uacute;n, se caracteriza    por la aparici&oacute;n de una &uacute;lcera indolora de l&iacute;mites definidos,    con aparici&oacute;n de costra central y a veces hemorr&aacute;gica. Puede curar    de forma espont&aacute;nea dejando una cicatriz hipopigmentada. En dependencia    del balance de la relaci&oacute;n hospedero par&aacute;sito, esa lesi&oacute;n    puede evolucionar en algunos pacientes hacia otras formas m&aacute;s complejas.<SUP>29</SUP>    </font>     <P><font face="Verdana" size="2">La forma recidiva cutis es rara en esta &aacute;rea    geogr&aacute;fica. Existen poco reportes donde se ha vinculado con par&aacute;sitos    que pertenecen al subg&eacute;nero <I>L.</I> (<I>Viannia</I>), en Brasil<SUP>30</SUP>    y Ecuador<SUP>31</SUP> Tambi&eacute;n <I>Leishmania</I> (L) <I>amazonensis</I>    se ha relacionado con esta presentaci&oacute;n.<SUP>32</SUP> </font>     <P><font face="Verdana" size="2">La leishmaniasis cut&aacute;nea diseminada se    caracteriza por la aparici&oacute;n de m&uacute;ltiples y variadas lesiones,    en lo fundamental acneiformes y papulares, en &aacute;reas no contiguas del    cuerpo.<SUP>33</SUP> En zonas del norte de Brasil, donde aument&oacute; la frecuencia    de esta presentaci&oacute;n, <I>L. braziliensis</I> fue la &uacute;nica especie    que se identific&oacute;.<SUP>34</SUP> </font>     <P><font face="Verdana" size="2">La leishmaniasis cut&aacute;nea difusa se caracteriza    por la presencia de n&oacute;dulos abundantes en par&aacute;sitos, que no ulceran,    y se considera una forma rara de presentaci&oacute;n.<SUP>35</SUP> Existen reportes    en Centro y Sur Am&eacute;rica y tambi&eacute;n Etiop&iacute;a, donde las especies    relacionadas son <I>L. mexicana</I>, <I>L. amazonensis</I> y <I>L. aethiopica</I>,    respectivamente.<SUP>29</SUP> </font>     <P><font face="Verdana" size="2">La leishmaniasis mucocut&aacute;nea la padece    de 1 a 10 % de los pacientes con leishmaniasis cut&aacute;neas<SUP>36</SUP>    y la produce en lo fundamental <I>L. braziliensis</I>, pero tambi&eacute;n se    ha asociado con infecciones por <I>L. guyanensis</I>, <I>L. panamensis</I> y    <I>L. amazonensis</I>. Puede aparecer de manera simult&aacute;nea a la enfermedad    cut&aacute;nea o presentarse varios a&ntilde;os despu&eacute;s de la cura. Ocurre    por diseminaci&oacute;n hemat&oacute;gena o linf&aacute;tica de los par&aacute;sitos    desde la piel hasta la mucosa oronasofar&iacute;ngea<SUP>35</SUP> y se hace    evidente por los s&iacute;ntomas nasales cr&oacute;nicos, que pueden continuar    con la destrucci&oacute;n progresiva de la cavidad bucal y nasofar&iacute;ngea,    en el contexto de una respuesta inmune hiperactiva<SUP>37</SUP>. Los reportes    son escasos fuera de Am&eacute;rica Latina, y en ellos el agente etiol&oacute;gico    t&iacute;pico es <I>L. aethiopica</I><SUP>10</SUP>. Es una enfermedad mutilante    que deja secuelas f&iacute;sicas y ps&iacute;quicas, las cuales dificultan la    reinserci&oacute;n social de las personas que la padecen. </font>     <P><font face="Verdana" size="2">Se considera que en el Viejo Mundo, las especies    que prevalecen pueden producir manifestaciones cl&iacute;nicas limitadas, en    comparaci&oacute;n con aquellas que predominan en el Nuevo Mundo. Es decir,    <I>L. major</I>, <I>L. tropica </I>y <I>L. aethiopica</I> pueden causar, en    86 a 98 % de los casos, lesiones ulcerativas localizadas que en su mayor&iacute;a    curan tras un periodo de evoluci&oacute;n de hasta 2 a&ntilde;os. <I>L. tropica</I>    produce la forma recidiva cutis, que se caracteriza por la aparici&oacute;n    simult&aacute;nea de lesiones papulares o vesiculares alrededor de la &uacute;lcera,    o posterior a la cura<SUP>38</SUP> y puntualmente se ha relacionado con la leishmaniasis    mucosa,<SUP>39</SUP> mientras <I>L. aethiopica</I> produce las formas localizada    y mucocut&aacute;nea y tambi&eacute;n se relaciona con la enfermedad cut&aacute;neo    difusa<SUP>38,40</SUP>. <I>L. donovani,</I> usualmente viscerotr&oacute;pica,    puede producir<I> </I>una forma cut&aacute;nea posterior a la enfermedad visceral,    conocida como leishmaniasis cut&aacute;nea pos-kala-azar.<SUP>41</SUP> </font>     <P><font face="Verdana" size="2">La diferenciaci&oacute;n de estas infecciones    cut&aacute;neas es imprescindible, porque otras enfermedades como la lepra,    el c&aacute;ncer de piel, la tuberculosis, las micosis cut&aacute;neas, as&iacute;    como las picaduras de insectos infectadas, el imp&eacute;tigo, la sarcoidosis    y los neoplasmas pueden producir lesiones similares.<SUP>42</SUP> Entre los    hongos pueden encontrarse <I>Paracoccidioides braziliensis</I>, <I>Histoplasma    capsulatum</I> y <I>Sporothrix schenkii</I>,<I> </I>as&iacute; como bacterias    piog&eacute;nicas tipo <I>Staphylococcus </I>y <I>Streptococcus </I>o tambi&eacute;n    <I>Mycobaterium</I>.<SUP>43</SUP> </font>     <P><font face="Verdana" size="2">En relaci&oacute;n con los casos de leishmaniasis    visceral, los pacientes presentan s&iacute;ntomas y signos de una infecci&oacute;n    sist&eacute;mica persistente como fiebre, fatiga, debilidad, p&eacute;rdida    de apetito y de peso. La invasi&oacute;n de par&aacute;sitos a la sangre y el    sistema ret&iacute;culo endotelial, provoca inflamaci&oacute;n de n&oacute;dulos,    bazo e h&iacute;gado. La hiperpigmentaci&oacute;n de la piel que se presenta    en pacientes del subcontinente indio y antes dio nombre a la enfermedad, es    un s&iacute;ntoma poco com&uacute;n, el cual se produce por una insuficiencia    suprarrenal y, al parecer, guardaba relaci&oacute;n con la duraci&oacute;n prolongada    de la enfermedad en tiempos en que el tratamiento efectivo no era posible.<SUP>44</SUP>    </font>     <P><font face="Verdana" size="2">Esta forma cl&iacute;nica debe diferenciarse    de la malaria, el s&iacute;ndrome de esplenomegalia tropical, esquistosomiasis,    cirrosis, tripanosomiasis africana, tuberculosis, brucelosis, fiebre tifoidea,    endocarditis bacteriana, histoplasmosis, malnutrici&oacute;n, linfoma y leucemia.<SUP>45</SUP>    Sin embargo, en la mayor&iacute;a de las ocasiones no existen condiciones o    recursos en las zonas end&eacute;micas para discriminar estas enfermedades.    </font>     ]]></body>
<body><![CDATA[<P>      <P><font face="Verdana" size="2"><B>Diagn&oacute;stico de laboratorio de las leishmaniasis    </B> </font>     <P>      <P><font face="Verdana" size="2">Los m&eacute;todos que se pueden utilizar para    realizar el diagn&oacute;stico son diversos y su utilidad depende, por lo general,    de la forma cl&iacute;nica de presentaci&oacute;n (<a href="#tab2">tabla 2</a>).    A continuaci&oacute;n se comentan los m&aacute;s importantes. </font>     <P align="center">&nbsp;     <p class=MsoNormal align=center style=' text-align:center;line-height:normal;text-autospace:none'><b><span style='font-size:10.0pt;font-family:Verdana'>Tabla 2.</span></b><span style='font-size:10.0pt;font-family:Verdana'> Principales formas de diagnóstico    recomendadas en relación con la forma clínica<a name="tab2"></a></span></p> <table class=MsoTableWeb1 border=1 cellspacing=3 cellpadding=0 width="580" align="center">   <tr style='height:28.55pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:28.55pt' height="86">            <p class=MsoNormal style='line-height:   normal'><span style='font-size:10.0pt;font-family:Verdana'>Método diagnóstico</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:28.55pt' height="86">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>Forma clínica relacionada</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:28.55pt' height="86">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Características distintivas*</span></p>     </td>   </tr>   <tr style='height:172.55pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:172.55pt' height="187">            <p class=MsoNormal style='line-height:   normal'><span style='font-size:10.0pt;font-family:Verdana'>Examen parasitológico    ]]></body>
<body><![CDATA[<br>         </span><span style='font-size:10.0pt;font-family:Verdana'>de muestras          clínicas    <br>         </span><span style='font-size:10.0pt;font-family:Verdana'>(<a></a><a>Examen           microscópico,     <br>         histopatológico </a>y cultivo)</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:172.55pt' height="187">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>Leishmania cutáneas    <br>         </span><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>Leishmania mucocutánea    <br>         </span><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>Leishmania visceral</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:172.55pt' height="187">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Aplicable en raspados, aspirados, biopsia    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Son específicos    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Requieren  experiencia técnica    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Frecuentes contaminaciones de cultivo    ]]></body>
<body><![CDATA[<br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Características anatomopatológicas difíciles de identificar    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Riesgoso para el paciente.    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Requiere de alta pericia en la toma de muestra    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Complicaciones  derivadas de hemorragias</span></p>       </td>   </tr>   <tr style='height:72.65pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:72.65pt'>            <p class=MsoNormal style='line-height:   normal'><span style='font-size:10.0pt;font-family:Verdana'>Prueba cutánea     <br>         de Montenegro</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:72.65pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania cutáneas    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania mucocutánea</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:72.65pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>No diferencia infecciones pasadas o recientes.    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Método complementario utilizado en áreas endémicas    ]]></body>
<body><![CDATA[<br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Aplicable a estudios epidemiológicos e inmunológicos</span></p>       </td>   </tr>   <tr>      <td style='padding:0cm 5.4pt 0cm 5.4pt' height="131">            <p class=MsoNormal style='line-height:   normal'><span style='font-size:10.0pt;font-family:Verdana'>Detección de anticuerpos    <br>         </span><span style='font-size:10.0pt;font-family:Verdana'>(IFI, ELISA,          rK39, electroinmunotransferencia)    <br>         </span><span style='font-size:10.0pt;font-family:Verdana'>Detección de          anticuerpos     <br>         por ensayo  de aglutinación     <br>         directa </span><span style='font-size:10.0pt;font-family:Verdana'>(DAT)</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt' height="131">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Leishmania visceral</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt' height="131">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Gran variedad de antígenos Buena sensibilidad y especificidad          en zonas endémicas    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Ensayo semicuantitativo. Buena sensibilidad y especificidad.          Requiere incubaciones y equipamiento</span></p>       </td>   </tr>   <tr style='height:24.3pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:24.3pt'>            <p class=MsoNormal style='line-height:   normal'><span style='font-size:10.0pt;font-family:Verdana'>Reacción en cadena              ]]></body>
<body><![CDATA[<br>         de la polimerasa </span><span style='font-size:10.0pt;font-family:Verdana'>(RCP)</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:24.3pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Aplicable a todas las formas clínicas</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:24.3pt'>            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Alta sensibilidad y especificidad.    <br>         </span><span style='font-size:10.0pt;   font-family:Verdana'>Aplicable a muestras diversas. Numerosos blancos genéticos          y cebadores empleados</span></p>       </td>   </tr> </table>     <p class=MsoNormal align=center style=' text-align:center;line-height:normal;text-autospace:none'><span style='font-size:10.0pt;font-family:Verdana'>* Se presentan algunas características    de los métodos que pueden resultar de utilidad en la toma de decisiones.</span></p>     <P align="center">&nbsp;     <P>&nbsp;      <P>      <P><font face="Verdana" size="2"><I>M&eacute;todo parasitol&oacute;gico</I> </font>     <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Los m&eacute;todos de diagn&oacute;stico parasitol&oacute;gico    son muy espec&iacute;ficos<SUP>42</SUP> y se aplican en todas las formas cl&iacute;nicas    de la enfermedad. Estos incluyen el examen microsc&oacute;pico de extendidos,    raspados, biopsias o aspirados, tomados por lo general del borde de las lesiones    y te&ntilde;idos con Giemsa,<SUP>45</SUP> pero la sensibilidad es baja, aproximadamente    de 50 a 70 % en el Viejo Mundo<SUP>46</SUP> y puede llegar a ser a&uacute;n    menor en el Nuevo Mundo, con valores de 15 a 30 %.<SUP>47,48</SUP> Tambi&eacute;n    se realiza el examen histopatol&oacute;gico para hacer la b&uacute;squeda de    amastigotes en distintos tejidos. </font>     <P><font face="Verdana" size="2">En la forma visceral la muestra para el examen    parasitol&oacute;gico directo se toma del aspirado de bazo, n&oacute;dulos linf&aacute;ticos    o m&eacute;dula &oacute;sea,<SUP>42</SUP> proceso muy invasivo para el paciente    y durante el cual pueden ocurrir complicaciones derivadas de hemorragias, por    lo que se requiere alta pericia en estos procederes y otras condiciones t&eacute;cnicas.<SUP>49</SUP>    </font>     <P>      <P><font face="Verdana" size="2"><I>Cultivo</I> </font>     <P>      <P><font face="Verdana" size="2">El cultivo de esas mismas muestras biol&oacute;gicas,    por lo general en medio bif&aacute;sico, (Novy, Mc Neal, Nicolle) resulta m&aacute;s    informativo; puede facilitar la identificaci&oacute;n y caracterizaci&oacute;n    de especies por m&eacute;todos isoenzim&aacute;ticos o moleculares, pero requiere    de mayores condiciones t&eacute;cnicas en el laboratorio y se necesita tiempo    para ofrecer el resultado.<SUP>33</SUP> La observaci&oacute;n de promastigotes    m&oacute;viles f&aacute;cilmente identificables en la fase l&iacute;quida del    medio cultivo, producto de la transformaci&oacute;n de los posibles amastigotes    presentes en la muestra sembrada, constituye el resultado positivo. Una reciente    modificaci&oacute;n el cultivo microcapilar en medio monof&aacute;sico, parece    m&aacute;s promisorio, porque se demostr&oacute; que la utilizaci&oacute;n de    una mezcla del aspirado de lesi&oacute;n y medio de cultivo a partes iguales,    sembrada en peque&ntilde;os vol&uacute;menes de 50 &#181;L en tubos microcapilares    no heparinizados, ocasiona a un incremento de la sensibilidad y requiere menor    tiempo de incubaci&oacute;n para obtener los resultados, lo que implica un avance    en t&eacute;rminos de costo y tiempo;<SUP>50</SUP> pero ese resultado no se    ha extendido a los servicios de salud. </font>     <P>      <P><font face="Verdana" size="2"><I>Prueba cut&aacute;nea de Montenegro</I> </font>     <P>      <P><font face="Verdana" size="2">La medici&oacute;n de la respuesta de hipersensibilidad    tard&iacute;a, como manifestaci&oacute;n de la respuesta inmune mediada por    c&eacute;lulas, tambi&eacute;n se utiliza como complemento diagn&oacute;stico    (prueba cut&aacute;nea de Montenegro). Consiste en la inyecci&oacute;n de 0,1    mL de ant&iacute;geno de <I>Leishmania</I> en el antebrazo. Si la induraci&oacute;n    local que produce tras 2 o 3 d es igual o mayor que 5 mm, la reacci&oacute;n    se considera positiva<SUP>29</SUP> y la observaci&oacute;n de la reacci&oacute;n    epid&eacute;rmica que se genera a consecuencia de la estimulaci&oacute;n celular.    Sin embargo, se aplica fundamentalmente como m&eacute;todo complementario en    casos de sospecha de enfermedad cut&aacute;nea y mucocut&aacute;nea, en estudios    epidemiol&oacute;gicos de todas las formas de la enfermedad y en ensayos de    vacunas, debido a que no diferencia infecciones pasadas o recientes.<SUP>51</SUP>    </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Los m&eacute;todos que se mencionaron con anterioridad    son los m&aacute;s utilizados en los distintos niveles de salud en las &aacute;reas    end&eacute;micas, que generalmente disponen de bajos recursos, y en muchos casos    el &eacute;xito depende de la experiencia del observador y de las condiciones    de las instalaciones. En algunos laboratorios se toman varias muestras del propio    paciente, ya sea de una misma lesi&oacute;n o de lesiones diferentes, como forma    de incrementar las posibilidades de &eacute;xito en la detecci&oacute;n. Sin    embargo, la sensibilidad var&iacute;a en dependencia de numerosos factores:    el n&uacute;mero y la dispersi&oacute;n de los par&aacute;sitos, fundamentalmente    en los casos del Nuevo Mundo, donde su abundancia en las lesiones puede variar    seg&uacute;n la especie,<SUP>52,53</SUP> de la contaminaci&oacute;n frecuente    del cultivo por la presencia de elementos bacterianos o f&uacute;ngicos en la    muestra biol&oacute;gica; y el hecho de que distintas especies de <I>Leishmania</I>    pueden tener diferentes requerimientos para su cultivo.<SUP>54</SUP> </font>     <P>      <P><font face="Verdana" size="2"><I>M&eacute;todos indirectos serol&oacute;gicos</I>    </font>     <P>      <P><font face="Verdana" size="2">Los m&eacute;todos serol&oacute;gicos se pueden    aplicar al diagn&oacute;stico de casos de enfermedad cut&aacute;nea, pero no    hay acuerdo sobre la mayor utilidad de uno u otro, y a veces las recomendaciones    de los autores son contradictorias. Tambi&eacute;n se comunica una eficacia    diferente entre el Viejo y el Nuevo Mundo, debido a la variaci&oacute;n en la    sensibilidad y la aparici&oacute;n de reacciones cruzadas.<SUP>55</SUP> </font>     <P><font face="Verdana" size="2"> Recientemente, se describieron protocolos de    ELISA especie-espec&iacute;ficos con valores de sensibilidad comparables (84,6    % y 88,5 %) y una especificidad adecuada (96,2 %), que se recomiendan como pruebas    complementarias para el diagn&oacute;stico de formas cut&aacute;neas causadas    por <I>L. braziliensis</I>, <I>L. guyanensis</I> y <I>L. amazonensis</I>.<SUP>56</SUP>    Sin embargo, al ser m&eacute;todos que detectan anticuerpos contra una especie    en particular, su utilidad se reduce en &aacute;reas donde coexista m&aacute;s    de una especie del par&aacute;sito. </font>     <P><font face="Verdana" size="2">Por otra parte, un estudio comparativo demostr&oacute;    que la inmunofluorescencia indirecta con ant&iacute;geno de promastigotes de    <I>L. amazonensis</I> y la tira inmunocromatogr&aacute;fica con ant&iacute;geno    recombinante rK39, tuvieron mejor desempe&ntilde;o para el diagn&oacute;stico    de casos cl&aacute;sicos en &aacute;reas end&eacute;micas, con valores de sensibilidad    de 83,3 y 88,9 %, respectivamente. Por el contrario, la aplicaci&oacute;n del    ELISA, independientemente del ant&iacute;geno utilizado, mostr&oacute; valores    de sensibilidad diagn&oacute;stica siempre bajos (50 %, 66,7 % y 69,4), y debido    a la aparici&oacute;n adicional de reacciones cruzadas, no se recomend&oacute;    ninguno en particular para las &aacute;reas end&eacute;micas.<SUP>57</SUP> </font>     <P><font face="Verdana" size="2">Tambi&eacute;n se utilizan el ant&iacute;geno    soluble o la fracci&oacute;n enriquecida de membrana, con una sensibilidad similar    para ambos, del 89,5% y una especificidad variable del 89,5% y 93,4% respectivamente,    en dependencia del preparado antig&eacute;nico de que se trate<SUP>58</SUP>.    </font>     <P><font face="Verdana" size="2">De manera general, debido a que los anticuerpos    circulantes en las presentaciones cut&aacute;neas tienen niveles muy bajos y    la especificidad de los ensayos puede ser tambi&eacute;n variable, particularmente    en &aacute;reas donde puedan ocurrir reacciones cruzadas con otros par&aacute;sitos,    como <I>Trypanosoma cruzi</I>,<SUP>51</SUP> estos m&eacute;todos permanecen    como herramientas complementarias en los casos de leishmaniasis cut&aacute;neas.    </font>     <P><font face="Verdana" size="2">Por el contrario, en la leishmaniasis visceral    la detecci&oacute;n de anticuerpos espec&iacute;ficos resulta muy &uacute;til    para el diagn&oacute;stico,<SUP>58</SUP> y se utilizan ensayos de ELISA, inmunoflurescencia    (IF) y electroinmunotransferencia (<I>Western blot</I>), que muestran en ocasiones    una alta seguridad diagn&oacute;stica, pero que tienen el inconveniente de ser    poco adaptables a condiciones de campo.<SUP>59</SUP> </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">El polip&eacute;ptido recombinante de 39 kDa:    <I>r</I>K39 se utiliz&oacute; en pa&iacute;ses end&eacute;micos en un sistema    ELISA de detecci&oacute;n de anticuerpos con excelentes valores de sensibilidad    (93-100 %) y especificidad (97-98 %).<SUP>60,61 </SUP>Este elemento promovi&oacute;    su transformaci&oacute;n en formato de tira inmunocromatogr&aacute;fica, m&aacute;s    factible para condiciones de campo. Un an&aacute;lisis de validaci&oacute;n    que incluy&oacute; 13 estudios en &aacute;reas de alta endemicidad ofreci&oacute;    valores similares para la sensibilidad (93,9 %) y especificidad (95,3 %) y tambi&eacute;n    se confirm&oacute; su valor diagn&oacute;stico en la India y Nepal.<SUP>62,63</SUP>    Sin embargo, su validez en el Este africano ha sido variable, puesto que los    pacientes sudaneses, por razones no esclarecidas a&uacute;n, presentan t&iacute;tulos    de anticuerpos m&aacute;s bajos contra esta prote&iacute;na.<SUP>64</SUP> Este    m&eacute;todo, f&aacute;cil y reproducible, se considera actualmente la mejor    herramienta diagn&oacute;stica de la leishmaniasis visceral para las &aacute;reas    remotas del Viejo Mundo. </font>     <P><font face="Verdana" size="2">La prueba de aglutinaci&oacute;n directa (DAT    siglas en ingl&eacute;s) es un ensayo semicuantitativo donde ocurre aglutinaci&oacute;n    visible si existen anticuerpos<SUP>65</SUP> y se ha evaluado en condiciones    de campo en diversos pa&iacute;ses.<SUP>66</SUP> Un metaan&aacute;lisis que    agrup&oacute; 30 estudios estim&oacute; los valores de sensibilidad y especificidad    del ensayo en 94,8 % y 97,1 %, respectivamente.<SUP>63</SUP> Se debe resaltar    que aunque se ha desarrollado para condiciones de campo, requiere de incubaciones,    disponibilidad de cierto equipamiento, personal bien entrenado y un control    de calidad regular.<SUP>64</SUP> </font>     <P><font face="Verdana" size="2">En el Instituto de Medicina Tropical &quot;Pedro    Kour&iacute;&quot; (IPK) se cuenta con el DAT como herramienta investigativa    y complemento en el estudio de casos donde exista sospecha de enfermedad visceral,    debido a que no se ha realizado la validaci&oacute;n del ensayo en &aacute;reas    end&eacute;micas. El ant&iacute;geno que se utiliza, de <I>L. donovani</I> cepa    1S, se produce en el laboratorio de investigaciones en Leishmania, de acuerdo    a las normas establecidas en el Instituto de Medicina Tropical de Amberes, B&eacute;lgica.    </font>      <P>      <P><font face="Verdana" size="2"><I>Diagn&oacute;stico molecular</I> </font>     <P>      <P><font face="Verdana" size="2">Los m&eacute;todos moleculares se utilizan ampliamente    en el diagn&oacute;stico de la leishmaniasis, porque permiten detectar el ADN    presente en una biopsia a&uacute;n en cantidades m&iacute;nimas (fentogramos)    o lo que es igual, hasta un solo par&aacute;sito.<SUP>67,68</SUP> Aunque esta    t&eacute;cnica ha demostrado ser la m&aacute;s sensible y espec&iacute;fica,    su uso est&aacute; restringido al tercer nivel de cuidados hospitalarios, laboratorios    de investigaci&oacute;n y tambi&eacute;n se recomienda su empleo en centros    de referencia.<SUP>69</SUP> </font>     <P><font face="Verdana" size="2">La informaci&oacute;n acerca de secuencias de    ADN, y el conocimiento de los genomas completos de algunas especies de <I>Leishmania</I>,    disponibles en la actualidad en las redes de informaci&oacute;n, constituyen    un aporte fundamental para desarrollar ensayos basados en la reacci&oacute;n    en cadena de la polimerasa (RCP), con aplicaciones que incluyen el diagn&oacute;stico.    Para este prop&oacute;sito se utilizan varios genes, de preferencia secuencias    multicopias, con la finalidad de desarrollar una m&aacute;xima sensibilidad    en la detecci&oacute;n. Las dianas gen&eacute;ticas m&aacute;s utilizadas para    el diagn&oacute;stico y sus caracter&iacute;sticas se muestran en la <a href="#tab3">tabla    3</a>. </font>     <P align="center">&nbsp;     <p class=MsoNormal align=center style=' text-align:center;line-height:normal'><b><span lang=ES-TRAD style='font-size: 10.0pt;font-family:Verdana'>Tabla 3.</span></b><span lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'> Características de algunas de las    dianas genéticas más utilizadas para la detección<a name="tab3"></a>     ]]></body>
<body><![CDATA[<br>   molecular o la identificación de especies del género <i>Leishmania</i></span></p> <table class=MsoTableWeb1 border=1 cellspacing=3 cellpadding=0 width="580" align="center" height="1220">   <tr style='height:31.95pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:31.95pt' width="74">            <p class=MsoNormal style='line-height:   normal'><span lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>Nombre          de la diana genética</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:31.95pt' width="130">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Secuencia correspondiente</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:31.95pt' width="92">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Nivel taxonómico de identificación</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:31.95pt' width="114">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Sensibilidad y especificidad diagnóstica</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:31.95pt' width="146">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Referencias</span></p>     </td>   </tr>   <tr style='height:65.65pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:65.65pt' width="74" height="158">            <p class=MsoNormal style='line-height:   normal'><span style='font-size:10.0pt;font-family:Verdana'>(ITS)</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:65.65pt' width="130" height="158">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Espaciadores internos de la transcripción</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:65.65pt' width="92" height="158">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Género    <br>         </span><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Especies</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:65.65pt' width="114" height="158">            ]]></body>
<body><![CDATA[<p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>S: 79,3 %     <br>         E: ND    <br>         </span><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>S: 91 %    <br>         </span><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>E: 100 %    <br>         </span><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>S: 40 %    <br>         </span><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>E: 96 %    <br>         </span><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>S: 80 %    <br>         </span><span lang=PT-BR style='font-size:10.0pt;   font-family:Verdana'>E: 100 %</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:65.65pt' width="146" height="158">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Marfurt</span></i><span style='font-size:10.0pt;   font-family:Verdana'> y otros, 2003<sup>70    <br>         </sup></span><i><span style='font-size:10.0pt;   font-family:Verdana'>Bensoussan</span></i><span style='font-size:10.0pt;   font-family:Verdana'> y otros, 2006<sup>71    ]]></body>
<body><![CDATA[<br>         </sup></span><i><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Ovalle-Bracho</span></i><span lang=ES-TRAD   style='font-size:10.0pt;font-family:Verdana'> y otros, 2007<sup>72    <br>         </sup></span><i><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Berzunza Cruz</span></i><span lang=ES-TRAD   style='font-size:10.0pt;font-family:Verdana'> y otros, 2009<sup>73</sup></span></p>       </td>   </tr>   <tr style='height:68.85pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="74" height="231">            <p class=MsoNormal style='line-height:   normal'><span style='font-size:10.0pt;font-family:Verdana'>(<i>k</i>DNA)</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="130" height="231">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>ADN del kinetoplasto</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="92" height="231">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal;text-autospace:none'><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>Género    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>Subgénero <i>Leishmania</i> (<i>V</i>.)    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>Especies</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="114" height="231">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal;text-autospace:none'><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S:90,1 %    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S:86,4 %      E: 100 %    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S: 98 %        ]]></body>
<body><![CDATA[<br>         E: 57 %    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S: 97,1 %        <br>         E: ND    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S: 68,6 %        <br>         E: 92 %    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S: 94,2 %        <br>         E: 92,9 %    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S: 94 %         <br>         E: 88 %    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S:96,6 %      ]]></body>
<body><![CDATA[<br>         E: 66,7 %    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S: 83,3 %        <br>         E: ND</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="146" height="231">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal;text-autospace:none'><i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>Marques</span></i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'> y otros, 2001<sup>74    <br>         </sup></span><i><span   style='font-size:10.0pt;font-family:Verdana'>Disch</span></i><span   style='font-size:10.0pt;font-family:Verdana'> y otros, 2005<sup>75    <br>         </sup></span><i><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Bensoussan</span></i><span lang=ES-TRAD   style='font-size:10.0pt;font-family:Verdana'> y otros, 2006<sup>71    <br>         </sup></span><i><span   style='font-size:10.0pt;font-family:Verdana'>Al-Hucheimi</span></i><span   style='font-size:10.0pt;font-family:Verdana'> y otros, 2009<sup>76    <br>         </sup></span><i><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Ovalle-Bracho</span></i><span lang=ES-TRAD   style='font-size:10.0pt;font-family:Verdana'> y otros, 2007<sup>72    <br>         </sup></span><i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>Boggild</span></i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'> y otros, 2010<sup>77    <br>         </sup></span><i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>Espinosa</span></i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'> y otros, 2009<sup>78    ]]></body>
<body><![CDATA[<br>         </sup></span><i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>Kumar</span></i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'> y otros, 2007<sup>79    <br>         </sup></span><i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>Gadisa</span></i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'> y otros, 2007<sup>80</sup></span></p>       </td>   </tr>   <tr style='height:68.85pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="74" height="225">            <p class=MsoNormal style='line-height:   normal'><span style='font-size:10.0pt;font-family:Verdana'>Ssu-rRNA (18S)</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="130" height="225">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span style='font-size:10.0pt;   font-family:Verdana'>Subunidad pequeña del     <br>         ARN ribosomal</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="92" height="225">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal;text-autospace:none'><span   style='font-size:10.0pt;font-family:Verdana'>Género    <br>         </span><span   style='font-size:10.0pt;font-family:Verdana'>Especies</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="114" height="225">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal;text-autospace:none'><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S:92 %         <br>         E: 99,6 %    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S: 93,2 %        ]]></body>
<body><![CDATA[<br>         E: 95,6 %    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S: 90,9 %       <br>         E: ND    <br>         </span><span lang=PT-BR   style='font-size:10.0pt;font-family:Verdana'>S: 99,3 %       <br>         E: ND    <br>         </span><span lang=EN-US   style='font-size:10.0pt;font-family:Verdana'>S: 83 %        <br>         E: 90,5 %    <br>         </span><span   style='font-size:10.0pt;font-family:Verdana'>S: 84,6 %     E: 100 %</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:68.85pt' width="146" height="225">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal;text-autospace:none'><i><span   style='font-size:10.0pt;font-family:Verdana'>Deborggraeve</span></i><span   style='font-size:10.0pt;font-family:Verdana'> y otros, 2008; 2008ª<sup>81, 82    <br>         </sup></span><i><span   style='font-size:10.0pt;font-family:Verdana'>Amato</span></i><span   style='font-size:10.0pt;font-family:Verdana'> y otros, 2009<sup>83    ]]></body>
<body><![CDATA[<br>         </sup></span><i><span   style='font-size:10.0pt;font-family:Verdana'>Chargui</span></i><span   style='font-size:10.0pt;font-family:Verdana'> y otros, 2005<sup>84    <br>         </sup></span><i><span   style='font-size:10.0pt;font-family:Verdana'>Vaish</span></i><span   style='font-size:10.0pt;font-family:Verdana'> y otros, 2011<sup>85    <br>         </sup></span><i><span   style='font-size:10.0pt;font-family:Verdana'>Lemrani </span></i><span   style='font-size:10.0pt;font-family:Verdana'>y otros, 2009<sup>86</sup></span></p>       </td>   </tr>   <tr style='height:37.75pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:37.75pt' width="74">            <p class=MsoNormal style='line-height:   normal'><span lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>(<i>gp</i>63)</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:37.75pt' width="130">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Gen que codifica la glicoproteína     <br>         de 63 kDa</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:37.75pt' width="92">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Especies</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:37.75pt' width="114">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>S: 85 %</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:37.75pt' width="146">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span style='font-size:10.0pt;   font-family:Verdana'>Victoir </span></i><span style='font-size:10.0pt;   font-family:Verdana'>y otros, 2003<sup>87</sup></span></p>     </td>   </tr>   <tr style='height:42.7pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:42.7pt' width="74">            <p class=MsoNormal style='line-height:   normal'><span lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>(<i>cpb</i>)</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:42.7pt' width="130">            ]]></body>
<body><![CDATA[<p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Gen que codifica la ciste&iacute;no proteinasa B</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:42.7pt' width="92">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Especies    <br>         </span><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Cepas</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:42.7pt' width="114">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>ND    <br>         </span><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>ND    <br>         </span><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>ND    <br>         </span><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>ND</span></p>       </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:42.7pt' width="146">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Quispe</span></i><span lang=ES-TRAD   style='font-size:10.0pt;font-family:Verdana'> y otros, 2004<sup>88    <br>         </sup></span><i><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Gadisa</span></i><span lang=ES-TRAD   style='font-size:10.0pt;font-family:Verdana'> y otros, 2010<sup>89    <br>         </sup></span><i><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Kuru</span></i><span lang=ES-TRAD   style='font-size:10.0pt;font-family:Verdana'> y otros, 2011<sup>40    ]]></body>
<body><![CDATA[<br>         </sup></span><i><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Oshagi</span></i><span lang=ES-TRAD   style='font-size:10.0pt;font-family:Verdana'> y otros, 2009<sup>90</sup></span></p>       </td>   </tr>   <tr style='height:46.75pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:46.75pt' width="74">            <p class=MsoNormal style='line-height:   normal'><span lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>mini-exon</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:46.75pt' width="130">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Genes que codifican los miniexones o  <i>spliced          leader</i> (SL)</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:46.75pt' width="92">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Especies</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:46.75pt' width="114">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>S: 89,7 %     <br>          E: ND</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:46.75pt' width="146">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Marfurt</span></i><span lang=ES-TRAD   style='font-size:10.0pt;font-family:Verdana'> y otros, 2003<sup>70</sup></span></p>     </td>   </tr>   <tr style='height:40.9pt'>      <td style='padding:0cm 5.4pt 0cm 5.4pt;height:40.9pt' width="74">            <p class=MsoNormal style='line-height:   normal'><i><span lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>hsp</span></i><span   lang=ES-TRAD style='font-size:10.0pt;font-family:Verdana'>70</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:40.9pt' width="130">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Genes que codifican la proteína de 7 kDa</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:40.9pt' width="92">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:   10.0pt;font-family:Verdana'>Especies</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:40.9pt' width="114">            ]]></body>
<body><![CDATA[<p class=MsoNormal align=center style='   text-align:center;line-height:normal'><span lang=FR style='font-size:10.0pt;   font-family:Verdana'>S: 95 %      <br>         E: 100 %</span></p>     </td>     <td style='padding:0cm 5.4pt 0cm 5.4pt;height:40.9pt' width="146">            <p class=MsoNormal align=center style='   text-align:center;line-height:normal'><i><span lang=FR style='font-size:10.0pt;   font-family:Verdana'>García</span></i><span lang=FR style='font-size:10.0pt;   font-family:Verdana'> y otros, 2007<sup>91,92</sup></span></p>     </td>   </tr> </table>     <p class=MsoNormal align=center style=' text-align:center;line-height:normal'><span lang=ES-TRAD style='font-size:10.0pt; font-family:Verdana'>S y E: indican la sensibilidad y especificidad diagnóstica    de la </span><span style='font-size:10.0pt;font-family:Verdana'>reacción en    cadena de la polimerasa</span><span lang=ES-TRAD style='font-size:10.0pt; font-family:Verdana'> correspondiente,      <br>   en aquellos casos en que se reportó. Se refieren solamente aplicaciones a la    detección o identificación en muestras clínicas.</span></p>     <p align="center">&nbsp;     <P><font face="Verdana" size="2">La superioridad de la reacci&oacute;n en cadena    de la polimerasa se explica tambi&eacute;n por el hecho de admitir aplicaciones    en un amplio rango de espec&iacute;menes cl&iacute;nicos, lo que reviste gran    importancia debido a la gran variedad de presentaciones de la leishmaniasis.    Entre estas muestras se cuentan: biopsia y raspado de piel, aspirados de m&eacute;dula    &oacute;sea y n&oacute;dulos, muestras de sangre<SUP>90,92,93</SUP> e incluso    conjuntiva.<SUP>94</SUP> Se notifica que es posible obtener ADN a partir de    preparaciones de aspirados de m&eacute;dula &oacute;sea, te&ntilde;idas previamente    con Giemsa,<SUP>95</SUP> y muy recientemente se report&oacute; el uso de papel    de filtro impregnado en la lesi&oacute;n,<SUP>96</SUP> as&iacute; como de aplicadores    en la mucosa bucal para la detecci&oacute;n de par&aacute;sitos en casos de    leishmaniasis visceral.<SUP>97</SUP> </font>     <P><font face="Verdana" size="2">En las formas cut&aacute;neas, la reacci&oacute;n    en cadena de la polimerasa es la herramienta diagn&oacute;stica de m&aacute;s    valor pues presenta valores de sensibilidad y especificidad altos.<SUP>71,80,98</SUP>    La sensibilidad y especificidad var&iacute;a en dependencia de la diana gen&eacute;tica    (<a href="#tab3">tabla 3</a>) y de la normalizaci&oacute;n del ensayo, pero    por lo general se reportan numerosos protocolos cuyos resultados no son comparables,    puesto que responden a necesidades de pa&iacute;ses o regiones y a la detecci&oacute;n    del par&aacute;sito en una u otra forma de la enfermedad;<SUP>90,99,100</SUP>    sin que exista una validaci&oacute;n multic&eacute;ntrica de estos, o se comparen    los distintos protocolos disponibles, para enfrentar el diagn&oacute;stico molecular    de manera uniforme. </font>      <P>      <P><font face="Verdana" size="2">La muestra de la cual se obtiene el ADN a analizar    se puede tomar mediante aplicadores con algod&oacute;n o palillos de dientes    est&eacute;riles, lo que constituye una alternativa no invasiva<SUP>91,101</SUP>    y tambi&eacute;n con papel de filtro.<SUP>96</SUP> Se han desarrollado tambi&eacute;n    reacci&oacute;n en cadena de la polimerasa especie-espec&iacute;ficas para la    identificaci&oacute;n de especies del par&aacute;sito de importancia m&eacute;dica    a nivel local.<SUP>99,102</SUP> </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">En la enfermedad mucocut&aacute;nea, la utilizaci&oacute;n    del ADN del kinetoplasto (<I>k</I>DNA) como diana gen&eacute;tica resulta muy    sensible para detectar los par&aacute;sitos, mientras que los genes que codifican    los espaciadores internos de la transcripci&oacute;n (ITS), resultan m&aacute;s    &uacute;tiles para discriminar entre las especies que producen esta forma cl&iacute;nica    en Brasil.<SUP>71</SUP> Se describi&oacute; tambi&eacute;n la detecci&oacute;n    de <I>k</I>DNA de par&aacute;sitos del subg&eacute;nero <I>L</I>. (<I>Viannia</I>)    en tejidos de la mucosa de 81 % (21/26) de pacientes con enfermedad cut&aacute;nea,    lo cual pudiera indicar, paralelamente, que este es un hecho com&uacute;n en    infecciones con par&aacute;sitos de este subg&eacute;nero.<SUP>103</SUP> </font>     <P><font face="Verdana" size="2">Por otra parte, se inform&oacute; de 46 casos    de leishmaniasis mucocut&aacute;nea procedentes del Amazonas, que se detectaron    mediante reacci&oacute;n en cadena de la polimerasa usando ADN obtenido de biopsias    embebidas en parafina.<SUP>104</SUP> </font>     <P><font face="Verdana" size="2">Para la leishmaniasis visceral, la detecci&oacute;n    de par&aacute;sitos por reacci&oacute;n en cadena de la polimerasa es m&aacute;s    sensible que el examen microsc&oacute;pico, el cultivo y los ex&aacute;menes    serol&oacute;gicos, en particular en muestras que tienen una baja carga parasitaria.<SUP>51</SUP>    Los valores de sensibilidad var&iacute;an, y se reporta un rango de 82 a 100    % si se compara con el examen microsc&oacute;pico,<SUP>105,106</SUP> mientras    que la especificidad puede estar entre 71,7 y 100 %.<SUP>107,108</SUP> Se recomienda    realizar la evaluaci&oacute;n de pacientes sospechosos en sangre perif&eacute;rica,    antes de proceder al examen sobre aspirado o biopsia.<SUP>109</SUP> Tambi&eacute;n    este m&eacute;todo puede ser &uacute;til para detectar los par&aacute;sitos    cuando hay peligro potencial para la transmisi&oacute;n de kala-azar mediante    transfusi&oacute;n, en cuyo caso la serolog&iacute;a tiene un papel muy limitado.<SUP>110</SUP>    </font>     <P><font face="Verdana" size="2">El uso de aplicadores en la zona bucal permiti&oacute;    detectar por primera vez casos de leishmaniasis visceral mediante una reacci&oacute;n    en cadena de la polimerasa que mostr&oacute; 83 % de sensibilidad y 90,5 % de    especificidad en grupos controles, usando como blanco una regi&oacute;n del    gen que codifica el fragmento 18S del rRNA.<SUP>97</SUP> Tambi&eacute;n, recientemente,    se inform&oacute; la posibilidad de detectar ADN de <I>Leishmania </I>en el    fluido oral de personas con esta forma de la enfermedad, con valores de sensibilidad    y especificidad que se consideran aceptables,<SUP>111</SUP> al tiempo que contin&uacute;an    nuevas aplicaciones para el diagn&oacute;stico en pa&iacute;ses del Viejo Mundo.<SUP>112</SUP>    </font>     <P><font face="Verdana" size="2">La leishmaniasis cut&aacute;nea posvisceral tambi&eacute;n    se puede diagnosticar mediante reacci&oacute;n en cadena de la polimerasa. Se    describe un protocolo que utiliza cebadores que amplifican <I>k</I>DNA, que    por su alta especificidad, resulta muy &uacute;til para el diagn&oacute;stico    de pacientes inmunocomprometidos, donde el diagn&oacute;stico serol&oacute;gico    falla a menudo.<SUP>113</SUP> </font>     <P><font face="Verdana" size="2">En relaci&oacute;n con los casos de coinfecci&oacute;n    de <I>Leishmania</I> con VIH, la reacci&oacute;n en cadena de la polimerasa    parece ser al menos tan sensible como otros m&eacute;todos aplicados cuando    se desea diagnosticar leishmaniasis visceral en muestras de sangre perif&eacute;rica.    Un estudio comparativo indic&oacute; que la reacci&oacute;n en cadena de la    polimerasa en sangre perif&eacute;rica y en muestras de m&eacute;dula &oacute;sea    es altamente sensible y espec&iacute;fica para el diagn&oacute;stico de la leishmaniasis    visceral tanto en pacientes inmunocompetentes como en inmunocomprometidos, lo    cual permite, adicionalmente, identificar la especie del par&aacute;sito cuando    se emplean como blanco cebadores que codifican para el rARN.<SUP>114</SUP> </font>     <P>      <P><font face="Verdana" size="2"><I>Diagn&oacute;stico en el Instituto de Medicina    Tropical &quot;Pedro Kour&iacute;</I>&quot;</font>      <P>      <P><font face="Verdana" size="2">En el laboratorio de Leishmania del IPK, en paralelo    al trabajo investigativo, se procesan las muestras cl&iacute;nicas humanas recibidas    del hospital de la instituci&oacute;n, cuando existe sospecha de leishmaniasis    importada, para lo cual se sigue un algoritmo que responde al tipo cl&iacute;nico    de leishmaniasis que se sospeche y las correspondientes herramientas diagn&oacute;sticas    que se aplican <a href="#fig2">(Fig. 2</a>). </font>     ]]></body>
<body><![CDATA[<P>&nbsp;     <P align="center"><img src="/img/revistas/mtr/v64n2/f0202112.jpg" width="580" height="465"><a name="fig2"></a>      <P>&nbsp;     <P><font face="Verdana" size="2">En primer lugar se realiza el examen parasitol&oacute;gico    directo de la muestra de raspado, impronta o biopsia. Esta muestra se fija en    metanol, despu&eacute;s se ti&ntilde;e con Giemsa y se observa con cuidado en    el microscopio de luz con aceite de inmersi&oacute;n, para realizar la identificaci&oacute;n    de los amastigotes, que se observan como estructuras redondeadas u ovaladas,    de color azuloso, donde se distingue el n&uacute;cleo, de color m&aacute;s intenso.    </font>      <P>      <P><font face="Verdana" size="2">En paralelo, se realiza el cultivo del aspirado    de la lesi&oacute;n, o de una muestra del tejido en medio Novy, McNeal, Nicolle    (NNN) cuya fase l&iacute;quida es el medio de Schneider y se incuba a 28 &#186;C.<SUP>29</SUP>    La b&uacute;squeda de promastigotes m&oacute;viles del par&aacute;sito, como    resultado de la transformaci&oacute;n de los amastigotes presentes en la muestra,    se realiza mediante la observaci&oacute;n diaria en un microscopio de luz invertido.    Para ofrecer un resultado negativo, el cultivo se mantiene hasta 15 d. </font>     <P>      <P><font face="Verdana" size="2">Para el diagn&oacute;stico molecular se cuenta    como m&eacute;todo de referencia con la reacci&oacute;n en cadena de la polimerasa-18S,    que amplifica un fragmento de 115 pb de la regi&oacute;n 18S del gen que codifica    el ARN ribosomal, y cuyos valores de sensibilidad y especificidad son adecuados:    (S: 92 % en sangre, 92,9 % en m&eacute;dula &oacute;sea y E: 99,6 en personas    procedentes de &aacute;reas no end&eacute;micas).<SUP>77</SUP> Posteriormente,    se inform&oacute; una sensibilidad de 93,2% en casos de enfermedad cut&aacute;nea    y mucocut&aacute;nea, y de 86 % en enfermedad visceral, siendo la especificidad    de 95 % en personas de &aacute;rea end&eacute;mica y de 98,3 % para personas    procedentes de &aacute;reas no end&eacute;micas.<SUP>81</SUP> Por estas razones    se normaliz&oacute; y adapt&oacute; a las condiciones del IPK. </font>     <P><font face="Verdana" size="2">En paralelo, se utiliza el gen que codifica la    prote&iacute;na de choque t&eacute;rmico de 70 kDa, como diana para la detecci&oacute;n    del par&aacute;sito por reacci&oacute;n en cadena de la polimerasa y la posterior    tipificaci&oacute;n de la especie infectante, sobre la base del polimorfismo    gen&eacute;tico identificado en secuencias nucleot&iacute;dicas de 14 especies    de este protozoo, que fueron estudiadas en nuestro grupo de trabajo.<SUP>115</SUP>    La identificaci&oacute;n de especie se logra mediante la restricci&oacute;n    enzim&aacute;tica del producto de amplificaci&oacute;n (RCP-RFLP),<SUP>116</SUP>    lo cual se aplic&oacute; al an&aacute;lisis de una representaci&oacute;n de    muestras cl&iacute;nicas procedentes de &aacute;reas end&eacute;micas de Colombia.<SUP>117</SUP>    </font>     <P><font face="Verdana" size="2">M&aacute;s recientemente, se desarrollaron 3    nuevas propuestas que permiten la detecci&oacute;n y tipificaci&oacute;n de    distintas especies del par&aacute;sito, en relaci&oacute;n con el fragmento    del gen <I>hsp</I>70 que se amplifique, (RCP-F, RCP-N y RCP-C), y la posterior    digesti&oacute;n del producto de amplificaci&oacute;n obtenido (RFLP-F, N y    C) con aplicaciones variables seg&uacute;n las distintas &aacute;reas geogr&aacute;ficas    o las formas cl&iacute;nicas de que se trate.<SUP>118</SUP> Estos protocolos    se encuentran hoy d&iacute;a en evaluaci&oacute;n en &aacute;reas end&eacute;micas,    con muestras cl&iacute;nicas diversas procedentes de pa&iacute;ses end&eacute;micos.    </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">En conclusi&oacute;n, para diagnosticar correctamente    la leishmaniasis no se debe despreciar ninguna de las alternativas posibles.    Una vez que existan elementos epidemiol&oacute;gicos que indiquen la infecci&oacute;n,    ser&aacute; &uacute;til tanto la cl&aacute;sica observaci&oacute;n del estadio    intracelular del par&aacute;sito o amastigote, presente en las c&eacute;lulas    de tejidos infectados, hasta la detecci&oacute;n de su ADN. Todos los m&eacute;todos    aportan informaci&oacute;n de utilidad para la toma de decisiones en el procedimiento    cl&iacute;nico, la imposici&oacute;n del tratamiento y el abordaje epidemiol&oacute;gico    de esta parasitosis. Entre estos, se propone un algoritmo de trabajo en nuestro    laboratorio, con el empleo de los m&eacute;todos que resultan m&aacute;s &uacute;tiles    de acuerdo a las condiciones y experiencias. </font>     <P><font face="Verdana" size="2">En este trabajo se pretende actualizar de forma    r&aacute;pida algunos aspectos relativos al diagn&oacute;stico de esta parasitosis,    mostrar la forma en que se ha abordado en nuestro contexto, y ofrecer algunas    alternativas que pudieran resultar de utilidad pr&aacute;ctica, tanto para laboratorios    de referencia en pa&iacute;ses no end&eacute;micos como en Cuba, y para algunas    &aacute;reas end&eacute;micas de leishmaniasis. </font>     <P>&nbsp;      <P>      <P><font face="Verdana" size="2"><B><font size="3">REFERENCIAS BIBLIOGR&Aacute;FICAS</font></B>    </font>      <P>      <!-- ref --><P><font face="Verdana" size="2">1. Blackwell JM, Fakiola M, Ibrahim ME, Jamieson    SE, Jeronimo SB, Miller EN, et al. Genetics and visceral leishmaniasis of mice    and man. Parasite Immunol. 2009;31:254-66.     </font>     <!-- ref --><P><font face="Verdana" size="2">2. Grimaldi G, Tesh RB. Leishmaniasis of the    New World: current concepts and implications for future research. Clin Microbiol    Rev. 1993;6:230-50.     </font>     ]]></body>
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<body><![CDATA[<!-- ref --><P><font face="Verdana" size="2">118. Montalvo AM, Fraga J, Maes I, Dujardin JC,    Van der Auwera G. Three new sensitive and specific heat shock protein 70 PCRs    for global <I>Leishmania</I> species identification. Eur J Clin Microbiol Infect    Dis. 2011; DOI 10.1007/s10096-011-1463-z.    </font>     <P>&nbsp;     <P>&nbsp;      <P>      <P>      <P><font face="Verdana" size="2">Recibido: 2 de febrero de 2012.     <br>   Aprobado: 16 de febrero de 2012. </font>     <P>&nbsp;     <P>&nbsp;      ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2"><I>Ana Margarita Montalvo</I>. Departamento de    Parasitolog&iacute;a. Instituto de Medicina Tropical &quot;Pedro Kour&iacute;&quot;.    Autopista Novia del Mediod&iacute;a Km 6&#189;. Lisa. La Habana, Cuba. Correo    electr&oacute;nico: <U><FONT  COLOR="#0000ff"><a href="mailto:amontalvo@ipk.sld.cu">amontalvo@ipk.sld.cu</a></FONT></U>    </font>       ]]></body><back>
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