<?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>0036-3634</journal-id>
<journal-title><![CDATA[Salud Pública de México]]></journal-title>
<abbrev-journal-title><![CDATA[Salud pública Méx]]></abbrev-journal-title>
<issn>0036-3634</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud Pública]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0036-36342009000900007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Contribuciones de la genética y la proteómica al estudio de la enfermedad de Chagas]]></article-title>
<article-title xml:lang="en"><![CDATA[Genomic and proteomic contributions for Chagas disease control]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Ordóñez]]></surname>
<given-names><![CDATA[Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Panzera]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tun-Ku]]></surname>
<given-names><![CDATA[Ezequiel]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferrandis]]></surname>
<given-names><![CDATA[Inés]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramsey]]></surname>
<given-names><![CDATA[Janine M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Salud Pública Centro Regional de Investigación en Salud Pública ]]></institution>
<addr-line><![CDATA[Tapachula Chiapas]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Salud Pública Centro de Investigación sobre Enfermedades Infecciosas ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de la República Facultad de Ciencias Sección Genética Evolutiva]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2009</year>
</pub-date>
<volume>51</volume>
<fpage>s410</fpage>
<lpage>s423</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0036-36342009000900007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0036-36342009000900007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0036-36342009000900007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La enfermedad de Chagas representa uno de los problemas más importantes de salud pública en el continente americano. El conocimiento sobre el genoma y el proteoma de los agentes de esta infección es esencial para desarrollar herramientas precisas y eficaces a corto y largo plazo y prevenir la transmisión. En el presente documento se destacan los aportes que han permitido mejorar el diseño, la implementación y la eficacia de las actividades de vigilancia y control de la enfermedad. Se revisan la contribución de la información genómica o proteómica sobre la distribución geográfica de los vectores, y la diversidad y la dinámica poblacional, además de la identificación de poblaciones y especies blanco para control. Por otra parte, se analiza la forma en que el conocimiento del genoma del parásito ha contribuido al diagnóstico de la infección, el estudio de las poblaciones de Trypanosoma cruzi, el tratamiento farmacológico y la interacción del parásito con sus hospederos. Una revisión de estas contribuciones incluye los temas de investigación básica y aplicada más destacados para el futuro inmediato.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Chagas disease represents one of the more significant public health problems in the Americas. Information regarding the genome and proteome of vectors and parasite, as well as their interactions, will be essential to develop specific and effective diagnostic and preventive tools. Advances that have contributed to the design, implementation, and efficacy of disease surveillance and control activities are reviewed. Genomic and proteomic information has contributed to a better understanding of vector distributions and dispersion, diversity, population dynamics, and control targets (populations and species). In addition, genomic and proteomic studies have impacted parasite diagnostics, Trypanosoma cruzi population dynamics, pharmacological treatment and knowledge of parasite-host interactions. Discussion of these contributions includes expectations for future basic and applied research questions.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[enfermedad de Chagas]]></kwd>
<kwd lng="es"><![CDATA[Triatominae]]></kwd>
<kwd lng="es"><![CDATA[Trypanosoma cruzi]]></kwd>
<kwd lng="en"><![CDATA[Chagas disease]]></kwd>
<kwd lng="en"><![CDATA[Triatominae]]></kwd>
<kwd lng="en"><![CDATA[Trypanosoma cruzi]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana"><b>ART&Iacute;CULOS DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="verdana"><b>Contribuciones de la gen&eacute;tica    y la prote&oacute;mica al estudio de la enfermedad de Chagas</b></font></p>     <p>&nbsp;</p> <font size="3" face="verdana"><b>Genomic and proteomic contributions for Chagas  disease control</b></font>       <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Teresa L&oacute;pez-Ord&oacute;&ntilde;ez,    PhD<SUP>I</SUP>; Francisco Panzera, PhD<SUP>II,III</SUP>; Ezequiel Tun-Ku, Bi&oacute;lI;    In&eacute;s Ferrandis, MSc<sup>III</sup>; Janine M Ramsey, PhD<SUP>I</SUP> </B></font></p>     <p><font size="2" face="Verdana"><sup>I</sup>Centro Regional de Investigaci&oacute;n en Salud    P&uacute;blica, Instituto Nacional de Salud P&uacute;blica. Tapachula, Chiapas,    M&eacute;xico    <br>   <sup>II</sup>Centro de Investigaci&oacute;n sobre Enfermedades Infecciosas,    Instituto Nacional de Salud P&uacute;blica. Cuernavaca, Morelos, M&eacute;xico    <br>   <sup>III</sup>Secci&oacute;n Gen&eacute;tica Evolutiva, Facultad de Ciencias,    Universidad de la Rep&uacute;blica. Montevideo, Uruguay</font></p>  <B>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp; </p> </B>  <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>RESUMEN</B></font></p>     <p><font size="2" face="Verdana">La enfermedad de Chagas representa uno de los    problemas m&aacute;s importantes de salud p&uacute;blica en el continente americano.    El conocimiento sobre el genoma y el proteoma de los agentes de esta infecci&oacute;n    es esencial para desarrollar herramientas precisas y eficaces a corto y largo    plazo y prevenir la transmisi&oacute;n. En el presente documento se destacan    los aportes que han permitido mejorar el dise&ntilde;o, la implementaci&oacute;n    y la eficacia de las actividades de vigilancia y control de la enfermedad. Se    revisan la contribuci&oacute;n de la informaci&oacute;n gen&oacute;mica o prote&oacute;mica    sobre la distribuci&oacute;n geogr&aacute;fica de los vectores, y la diversidad    y la din&aacute;mica poblacional, adem&aacute;s de la identificaci&oacute;n    de poblaciones y especies blanco para control. Por otra parte, se analiza la    forma en que el conocimiento del genoma del par&aacute;sito ha contribuido al    diagn&oacute;stico de la infecci&oacute;n, el estudio de las poblaciones de    <I>Trypanosoma cruzi</I>, el tratamiento farmacol&oacute;gico y la interacci&oacute;n    del par&aacute;sito con sus hospederos. Una revisi&oacute;n de estas contribuciones    incluye los temas de investigaci&oacute;n b&aacute;sica y aplicada m&aacute;s    destacados para el futuro inmediato.</font></p>     <p><font size="2" face="Verdana"><b>Palabras claves:</b> enfermedad de Chagas;    <I>Triatominae</I>; <I>Trypanosoma cruzi</I></font></p> <hr size="1" noshade>     <p><font size="2" face="VERDANA"><b>ABSTRACT</b></font></p>       <p><font size="2" face="Verdana">Chagas disease represents one of the more significant    public health problems in the Americas. Information regarding the genome and    proteome of vectors and parasite, as well as their interactions, will be essential    to develop specific and effective diagnostic and preventive tools. Advances    that have contributed to the design, implementation, and efficacy of disease    surveillance and control activities are reviewed. Genomic and proteomic information    has contributed to a better understanding of vector distributions and dispersion,    diversity, population dynamics, and control targets (populations and species).    In addition, genomic and proteomic studies have impacted parasite diagnostics,    <I>Trypanosoma cruzi</I> population dynamics, pharmacological treatment and    knowledge of parasite-host interactions. Discussion of these contributions includes    expectations for future basic and applied research questions.</font></p>     <p><font size="2" face="Verdana"><b>Key words:</b> Chagas disease; <I>Triatominae</I>;    <I>Trypanosoma cruzi</I></font></p> <hr size="1" noshade>     <p>&nbsp;</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">La enfermedad de Chagas, causada por la infecci&oacute;n    del par&aacute;sito <I>Trypanosoma cruzi</I> y transmitida, sobre todo al hombre,    por insectos hem&iacute;pteros pertenecientes a la subfamilia <I>Triatominae</I>,    representa uno de los problemas m&aacute;s importantes de salud p&uacute;blica    en el continente americano. Hacia finales de la d&eacute;cada de 1980, se calculaba    que de 16 a 18 millones de personas estaban infectadas con el par&aacute;sito    y que 90 a 100 millones viv&iacute;an en situaci&oacute;n de riesgo, con una    incidencia de 450000 nuevas infecciones por a&ntilde;o.<SUP>1</SUP> En t&eacute;rminos    de impacto socioecon&oacute;mico, la enfermedad de Chagas representa la parasitosis    m&aacute;s importante en Am&eacute;rica.<SUP>2</SUP> A pesar de los programas    exitosos de control vectorial en Sudam&eacute;rica, a&uacute;n persisten entre    10 y 12 millones de personas infectadas y 200000 nuevos casos por a&ntilde;o.<SUP>3-5</SUP>    Tan s&oacute;lo en M&eacute;xico se calcula que existen 2 millones de personas    infectadas, 650000 casos cr&oacute;nicos atendidos actualmente por los servicios    de salud, 69000 nuevos casos anuales y una mortalidad no menor de 25000 por    a&ntilde;o.<SUP>6</sup></font></p>     <p><font size="2" face="Verdana"> Si se adopta una posici&oacute;n optimista sobre    la decisi&oacute;n pol&iacute;tica y econ&oacute;mica de desarrollar programas    precisos y sustentables para el control vectorial de la transmisi&oacute;n de    <I>Trypanosoma cruzi</I> en todas las regiones del continente americano a corto    o mediano plazos, se requerir&aacute;n todav&iacute;a herramientas m&aacute;s    eficaces para prevenir la presencia del vector en el h&aacute;bitat dom&eacute;stico,    medir la transmisi&oacute;n del par&aacute;sito al ser humano, el diagn&oacute;stico    preciso y oportuno de la infecci&oacute;n, el tratamiento terap&eacute;utico,    la prognosis de desarrollo del cuadro cr&oacute;nico, as&iacute; como de tratamientos    de largo alcance. Los conocimientos sobre la gen&eacute;tica/genoma y los proteomas    del vector y el par&aacute;sito ser&aacute;n esenciales para desarrollar instrumentos    precisos y eficaces para complementar las soluciones socioculturales e impedir    la transmisi&oacute;n. Una alta proporci&oacute;n del genoma de <I>T. cruzi</I>    ya se ha publicado<SUP>7</SUP> y est&aacute; en proceso la secuenciaci&oacute;n    del genoma de <I>Rhodnius prolixus</I>. Ya existe un consorcio de instituciones    que trabajan en colaboraci&oacute;n sobre el genoma de <I>Triatoma dimidiata</I>,    &uacute;nica especie que se distribuye naturalmente entre Am&eacute;rica del    Norte y Am&eacute;rica del Sur. En el presente trabajo se exponen las principales    aportaciones de la gen&eacute;tica al control de los insectos vectores, as&iacute;    como las futuras contribuciones que puedan realizarse para reducir en grado    significativo la transmisi&oacute;n vectorial. Se revisan aqu&iacute; los avances    en el conocimiento de la estructura poblacional de <I>T. cruzi</I>, las necesidades    de informaci&oacute;n para desarrollar diversas herramientas para el diagn&oacute;stico    y la prevenci&oacute;n de la transmisi&oacute;n, adem&aacute;s de las evidencias    moleculares que permitir&aacute;n desarrollar estrategias eficaces para el control    farmacol&oacute;gico y alternativo de la infecci&oacute;n.</font></p>     <p><i><b><font size="2" face="Verdana">Triatominae</font> </b></i></p>     <p><font size="2" face="Verdana">Existen diferentes formas de transmisi&oacute;n    del par&aacute;sito, pero la principal es la vectorial (&gt;96% en M&eacute;xico).    En ausencia de una vacuna y tratamientos m&eacute;dicos farmacol&oacute;gicos    m&aacute;s eficaces, la herramienta m&aacute;s importante para combatir la transmisi&oacute;n    de esta enfermedad es el control dom&eacute;stico de los insectos vectores mediante    el rociado de las casas con insecticidas residuales, la mejor&iacute;a de las    viviendas y la activaci&oacute;n de programas de participaci&oacute;n comunitaria    para la prevenci&oacute;n y la vigilancia. El tamizaje serol&oacute;gico de    la sangre destinada a transfusi&oacute;n es esencial para complementar el control    vectorial. </font></p>     <p><font size="2" face="Verdana"> A partir de 1991 se instituy&oacute; una serie    de programas o iniciativas intergubernamentales y regionales enfocados en la    eliminaci&oacute;n de la transmisi&oacute;n vectorial (mediante la eliminaci&oacute;n    de los triatominos dom&eacute;sticos) y la transfusional (mediante un control    completo de tamizaje en los bancos de sangre). El mayor &eacute;xito con control    qu&iacute;mico lo alcanz&oacute; la Iniciativa del Cono Sur (INCOSUR),<SUP>8</SUP>    que se tradujo en una disminuci&oacute;n de la distribuci&oacute;n geogr&aacute;fica    del principal vector dom&eacute;stico, <I>Triatoma infestans</I>. Las dificultades    encontradas por los programas multinacionales indican la necesidad de aplicar    nuevas medidas asociadas con los aspectos socioculturales de la transmisi&oacute;n    y vigilancia, y con la ecolog&iacute;a y gen&eacute;tica del vector.<SUP>9</SUP>    </font></p>     <p><font size="2" face="Verdana"> Un factor crucial para la reducci&oacute;n de    la transmisi&oacute;n vectorial es el conocimiento de las caracter&iacute;sticas    biol&oacute;gicas de los insectos, incluidas las ecol&oacute;gicas y gen&eacute;ticas.<SUP>10</SUP>    La capacidad de dispersi&oacute;n de una especie (tanto de forma natural como    por la intervenci&oacute;n del hombre), su adaptaci&oacute;n a ocupar diversos    h&aacute;bitats silvestres y su capacidad de invadir y colonizar ambientes perturbados    (especializaci&oacute;n ecol&oacute;gica), as&iacute; como los mecanismos del    intercambio de individuos entre ecotopos silvestres, perturbados y dom&eacute;sticos,    son factores esenciales que determinan qu&eacute; tipo de programas deben instituirse    para reducir la transmisi&oacute;n vectorial de la enfermedad de Chagas al hombre    a corto y largo plazos. </font></p>     <p><font size="2" face="Verdana"> Cualquier programa de control necesita reconocer    cu&aacute;les son las especies blanco sujetas a intervenci&oacute;n, para lo    cual es indispensable una correcta identificaci&oacute;n taxon&oacute;mica.    La mayor&iacute;a de los triatominos se reconoce mediante caracteres morfol&oacute;gicos    externos de la etapa adulta,<SUP>11</SUP> pero existen algunos grupos de especies    dif&iacute;ciles de diferenciar aun en esa etapa o en la fase ninfal; entre    ellos cabe destacar por su importancia vectorial a los complejos <I>dimidiata,    phyllosoma, brasiliensis,sordida</I> y <I>prolixus.</I> La similitud    morfol&oacute;gica entre especies hermanas se debe a una divergencia reciente,    o bien a una convergencia morfol&oacute;gica.<SUP>12</SUP> Estudios fen&eacute;ticos    y gen&eacute;ticos sugieren que la especiaci&oacute;n en <I>Triatominae</I>    es un proceso muy r&aacute;pido y lo determinan sobre todo factores ecol&oacute;gicos    y la deriva gen&eacute;tica. Esto es en particular importante para el control    vectorial, ya que se ha observado que la adaptaci&oacute;n a ambientes dom&eacute;sticos    puede estar acompa&ntilde;ada de r&aacute;pidos cambios morfol&oacute;gicos,    incluso antes del establecimiento de barreras reproductivas o gen&eacute;ticas.<SUP>13</SUP>    Desde 1997, la aplicaci&oacute;n de diversas metodolog&iacute;as gen&eacute;ticas    ha permitido identificar especies cr&iacute;pticas o gemelas, es decir, especies    morfol&oacute;gicamente indistinguibles pero que est&aacute;n aisladas en t&eacute;rminos    reproductivos y tienen importancia epidemiol&oacute;gica distinta. Entre estos    estudios deben destacarse aqu&eacute;llos que incluyen especies con importancia    vectorial significativa, tales como los del grupo <I>sordida,</I><SUP>14,15</SUP>    grupo <I>brasiliensis,</I><SUP>16</SUP> grupo <I>dimidiata</I><SUP>17,18 </SUP>y    los ya mencionados en la diferenciaci&oacute;n entre <I>R. prolixus</I> y <I>R.    robustus</I>. A&uacute;n falta dilucidar la diferenciaci&oacute;n dentro de    las especies del grupo <I>phyllosoma</I>, integrado por m&uacute;ltiples especies    end&eacute;micas de M&eacute;xico que representan 67% de la transmisi&oacute;n    vectorial en este pa&iacute;s.<SUP>6</SUP> </font></p>     <p><font size="2" face="Verdana"> De norte a sur, son m&uacute;ltiples los complejos    de especies de <I>Triatominae</I> y la mayor parte juega un papel relevante    en la transmisi&oacute;n de la enfermedad de Chagas. En Norteam&eacute;rica    (M&eacute;xico y Estados Unidos de Am&eacute;rica) se destacan los complejos    <I>rubida, protracta, phyllosoma</I> y <I>dimidiata</I>; en Centroam&eacute;rica    s&oacute;lo se encuentran de forma aut&oacute;ctona dos subespecies del complejo    <I>dimidiata</I> y dos especies del complejo <I>protracta</I>. A partir de Panam&aacute;    se destaca <I>Rhodnius pallescens</I> y en los pa&iacute;ses andinos y la Amazonia,    m&uacute;ltiples especies de <I>R. prolixus</I> y<I> robustus</I>, dos subespecies    del complejo <I>dimidiata</I>, el complejo <I>brasiliensis</I> en Brasil y el    grupo <I>sordida</I> que se extiende hasta Argentina.<SUP>19</sup></font></p>     <p><font size="2" face="Verdana"> A pesar de los avances recientes en estudios    sobre la gen&eacute;tica, incluida la poblacional de los triatominos,<SUP>9,20,21</SUP>    pocas especies o complejos se han estudiado a profundidad como <I>T.infestans,    R. prolixus</I> o el complejo <I>dimidiata</I>. En seguida se resumen los estudios    sobre estas especies, los cuales han servido para extender el conocimiento sobre    la subfamilia y dise&ntilde;ar mejores barreras contra su domesticaci&oacute;n.</font></p>     <p><font size="2" face="Verdana"><i><b>Triatoma infestans</b></i></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><I>Triatoma infestans</i> representa el mejor    ejemplo de dispersi&oacute;n y adaptaci&oacute;n exitosa al ambiente dom&eacute;stico    observado en la subfamilia <I>Triatominae</I>. En 1991 se consideraba el principal    vector y el m&aacute;s extendido en Am&eacute;rica del Sur (no se ha registrado    en Norteam&eacute;rica o Centroam&eacute;rica). Era causante de m&aacute;s de    la mitad de los 18 millones de personas infectadas con <I>T. cruzi</I> en el    continente.<SUP>1</SUP> Su distribuci&oacute;n abarcaba m&aacute;s de 6 millones    de kil&oacute;metros cuadrados, incluida las extensas regiones de Argentina,    Bolivia, Brasil, Chile, Paraguay, Uruguay y sur de Per&uacute;. Durante los    10 primeros a&ntilde;os de la Iniciativa del Cono Sur (INCOSUR) se fumigaron    con insecticidas m&aacute;s de 2.5 millones de casas y como resultado se redujo    en grado sustancial la distribuci&oacute;n de <I>T. infestans</I> a menos de    1 mill&oacute;n de kil&oacute;metros cuadrados que ocupa hoy d&iacute;a (David    Gorla, comunicaci&oacute;n personal). Un elemento clave para el &eacute;xito    de la INCOSUR fue el conocimiento de las caracter&iacute;sticas biol&oacute;gicas    del vector. </font></p>     <p><font size="2" face="Verdana"><I>Triatoma infestans </i>se encuentra casi exclusivamente    en ambientes dom&eacute;sticos y peridom&eacute;sticos. Su presencia en entornos    silvestres s&oacute;lo se ha confirmado en valles andinos de Cochabamba y Sucre    en Bolivia.<SUP>22-24</SUP> Este hallazgo junto con reconstrucciones hist&oacute;ricas    basadas en las migraciones humanas sugiere que Bolivia era el centro de origen    y domesticaci&oacute;n de <I>T. infestans</I>, a partir del cual las poblaciones    dom&eacute;sticas se dispersaron al resto de Am&eacute;rica del Sur.<SUP>25</SUP>    Resultados gen&eacute;ticos basados en isoenzimas<SUP>26</SUP> y en variaciones    cromos&oacute;micas y del tama&ntilde;o gen&oacute;mico<SUP>27</SUP> confirmaron    a Bolivia como centro de origen. Sin embargo, lo m&aacute;s sorprendente es    que los insectos que se dispersaron desde Bolivia hacia regiones no andinas    sufrieron una dr&aacute;stica disminuci&oacute;n del tama&ntilde;o de sus genomas.    Las poblaciones derivadas de Argentina, Brasil, Paraguay y Uruguay presentan    una reducci&oacute;n de 30 a 40% del DNA gen&oacute;mico en comparaci&oacute;n    con las ancestrales de Bolivia. Esta notoria reducci&oacute;n del contenido    de DNA supone cambios adaptativos de tal forma que los insectos de menor genoma    experimentaron una r&aacute;pida y exitosa dispersi&oacute;n y adaptaci&oacute;n    a los domicilios, pero como contraparte se atenu&oacute; en gran medida su capacidad    de retornar a ambientes silvestres.<SUP>27</SUP> S&oacute;lo de manera excepcional    se han detectado poblaciones de <I>T. infestans</I> silvestres en regiones no    andinas.<SUP>28,29</SUP> Por lo anterior, <I>T. infestans</I> en la mayor parte    de su rango de distribuci&oacute;n es una especie introducida en fecha reciente,    muy adaptada al ambiente dom&eacute;stico y con capacidad reducida para retornar    al medio silvestre y, por consiguiente, susceptible a las campa&ntilde;as de    control qu&iacute;mico. Estas caracter&iacute;sticas explicar&iacute;an el &eacute;xito    de su erradicaci&oacute;n en la mayor parte de los pa&iacute;ses del Cono Sur    y justificar&iacute;an continuar el control qu&iacute;mico para la eliminaci&oacute;n    del vector.<SUP>30</SUP> </font></p>     <p> <font size="2" face="Verdana">En Bolivia existen focos silvestres que al parecer    son la fuente de origen de las reinfestaciones encontradas despu&eacute;s de    control. Estudios basados en morfometr&iacute;a,<SUP>31</SUP> y en fecha m&aacute;s    reciente en microsat&eacute;lites (Noireau, comunicaci&oacute;n personal), apoyan    la hip&oacute;tesis de un aislamiento entre los ecotopos silvestres y dom&eacute;sticos    de <I>T. infestans</I> en Cochabamba. Estos estudios revelan, al menos en esa    regi&oacute;n, la importancia epidemiol&oacute;gica que se ha atribuido a los    focos silvestres como fuente primaria de las reinfestaciones. La detecci&oacute;n    de nuevos focos silvestres en Bolivia, y su posible ocurrencia en regiones vecinas    de Paraguay y Argentina, plantea la necesidad de determinar su capacidad de    reinvadir ambientes dom&eacute;sticos.<SUP>32</SUP> El desarrollo de nuevos    marcadores moleculares, como los microsat&eacute;lites, permitir&aacute; calcular    de forma mas precisa la magnitud del flujo de individuos entre focos silvestres    y dom&eacute;sticos<SUP>33,34</SUP> y, por lo tanto, su importancia vectorial.</font></p>     <p> <font size="2" face="Verdana">La reciente detecci&oacute;n de poblaciones    de <I>T. infestans</I> resistentes a insecticidas de tipo piretroides en el    norte de Argentina,<SUP>35</SUP> extendidas hacia el centro y sur de Bolivia,    es el reto m&aacute;s importante y novedoso que enfrenta el control de esta    especie. Es prioritario eliminar estas poblaciones, as&iacute; como es indispensable    determinar cu&aacute;l es el componente gen&eacute;tico de esta resistencia,    incluidas su expresi&oacute;n y herencia. La identificaci&oacute;n de marcadores    fen&eacute;ticos o gen&eacute;ticos que discriminen a los individuos susceptibles    de los resistentes permitir&aacute; conocer la dispersi&oacute;n de la resistencia    y por tanto ayudar&aacute; en grado considerable al dise&ntilde;o de las campa&ntilde;as    de control vectorial. &Eacute;ste es uno de los objetivos de un proyecto en    curso desde el a&ntilde;o 2005, integrado por un numeroso grupo de investigadores    de Argentina, Bolivia, Francia, Paraguay y Uruguay, bajo el financiamiento de    la Comunidad Europea (proyecto ATU-SSA 2004-515942) y cuyos resultados han demostrado    poca dispersi&oacute;n de la resistencia a los piretroides, s&oacute;lo con    resistencia a la deltametrina. Sin embargo, se ha observado que algunas cepas    o poblaciones de <I>T. infestans</I> resistentes a deltametrina son susceptibles    a los organofosforados.<SUP>35-37</sup></font></p>     <p><font size="2" face="Verdana"><i><b>Rhodnius prolixus</b></i></font></p>     <p><font size="2" face="Verdana"><I>Rhodnius prolixus</i> es una especie distribuida    en Venezuela, Colombia y varios pa&iacute;ses de Centroam&eacute;rica; en la    mayor parte de estas naciones es la principal especie vectora de <I>T. cruzi</I>.    Al igual que <I>T. infestans</I>, <I>R. prolixus</I> en Centroam&eacute;rica    es una especie exclusivamente dom&eacute;stica, introducida de forma accidental    por el hombre.<SUP>38</SUP> An&aacute;lisis mediante morfometr&iacute;a, RAPD    e isoenzimas<SUP>39</SUP> indican que las poblaciones centroamericanas, hasta    ahora incapaces de colonizar ambientes silvestres, presentan una menor variabilidad    gen&eacute;tica que las de Sudam&eacute;rica, lo que las convierte en poblaciones    muy susceptibles a las campa&ntilde;as de control qu&iacute;mico. Los auspiciosos    logros de los programas de control vectorial alcanzados por la Iniciativa de    Am&eacute;rica Central<SUP>40</SUP> corroboran los estudios gen&eacute;ticos.    Otro aporte importante de la gen&eacute;tica al control de <I>R. prolixus</I>    fue la diferenciaci&oacute;n entre <I>R. prolixus</I> y <I>R. robustus</I>,    especies morfol&oacute;gicamente muy similares. Hasta hace pocos a&ntilde;os    se pensaba que la presencia de <I>R. robustus</I> en palmeras era la fuente    de origen de <I>R. prolixus</I> dom&eacute;stico. Estudios mediante morfometr&iacute;a    geom&eacute;trica<SUP>41</SUP>, RAPD<SUP>42</SUP>, y sobre todo el an&aacute;lisis    de fragmentos mitocondriales,<SUP>43</SUP> confirmaron que se trata de especies    distintas y, como consecuencia, blancos separados y diferenciados para las campa&ntilde;as    de control vectorial. </font></p>     <p><font size="2" face="Verdana"> Bajo el financiamiento de los Institutos Nacionales    de Salud de los Estados Unidos (NIH) actualmente se encuentra en proceso la    secuenciaci&oacute;n del genoma completo de <I>R. prolixus,</I> primera especie    de triatominas estudiada por esta metodolog&iacute;a por la Universidad de Washington    (<I>The Genome Sequencing Center</I>). La secuenciaci&oacute;n del genoma, con    un tama&ntilde;o estimado de 670 Mb,<SUP>44</SUP> aportar&aacute; una informaci&oacute;n    inestimable acerca de distintos aspectos del insecto. No s&oacute;lo proveer&aacute;    informaci&oacute;n b&aacute;sica para estudios prote&oacute;micos y filog&eacute;nicos,    sino que facilitar&aacute; en particular la identificaci&oacute;n de productos    g&eacute;nicos que intervienen en la interacci&oacute;n hospedero-par&aacute;sito    o la identificaci&oacute;n de genes activos en el desarrollo del insecto; esto    har&aacute; posible interferir la transmisi&oacute;n del par&aacute;sito.</font></p>     <p><font size="2" face="Verdana"><b>Complejo <i>dimidiata</i></b></font></p>      <p><font size="2" face="Verdana">El complejo <I>dimidiata </I>se distribuye desde    M&eacute;xico, Centroam&eacute;rica completa, Colombia, Ecuador y Per&uacute;;    en varios de estos pa&iacute;ses es el principal vector de la enfermedad de    Chagas. A lo largo de su rango de distribuci&oacute;n se encuentra en ambientes    dom&eacute;sticos y silvestres y ocupa ecotopos muy diversos. Estas especies    presentan variaciones morfol&oacute;gicas y crom&aacute;ticas que han generado    una extensa discusi&oacute;n acerca de su estatus taxon&oacute;mico.<SUP>11</SUP>    Los serios problemas taxon&oacute;micos sumados a la gran dispersi&oacute;n    geogr&aacute;fica y diversidad de ecotopos que ocupa esta especie<SUP>45-47  </sup>dificultan las medidas de control vectorial.</font></p>     <p><font size="2" face="Verdana"> La primera evidencia de que esta especie estaba    constituida por m&aacute;s de un grupo taxon&oacute;mico la aport&oacute; el    an&aacute;lisis de secuencias del ITS-2 del DNA ribosomal.<SUP>17</SUP> Se determin&oacute;    una clara diferenciaci&oacute;n gen&eacute;tica entre <I>T. dimidiata</I> de    la pen&iacute;nsula de Yucat&aacute;n y el resto de las poblaciones distribuidas    desde M&eacute;xico hasta Colombia. Los resultados revelaron que existe un clino    norte-sur de poblaciones poco diferenciadas morfol&oacute;gicamente, las cuales    se encuentran en ambientes silvestres y dom&eacute;sticos. Las poblaciones de    Ecuador y del norte de Per&uacute; son exclusivamente dom&eacute;sticas sin    ecotopos silvestres conocidos<SUP>48</SUP> y presentan una gran similitud gen&eacute;tica    con las poblaciones de Guatemala y Honduras, en lugar de representar derivados    naturales del supuesto clino norte-sur.<SUP>17</SUP> Estudios con marcadores    mitocondriales (LSU y ND4) sugirieron por lo menos tres clados o especies seg&uacute;n    una divergencia combinada superior a 6.8%,<SUP>49</SUP> datos que se correlacionan    con hidrocarburos cuticulares<SUP>50</SUP> y morfometr&iacute;a.<SUP>51</SUP>    Recientes estudios que incluyen el an&aacute;lisis de elementos cromos&oacute;micos,    genes ribosomales y del tama&ntilde;o gen&oacute;mico han sugerido la existencia    de tres especies cr&iacute;pticas gen&eacute;ticamente diferenciadas pero morfol&oacute;gicamente    muy similares en <I>T. dimidiata.</I><SUP>18,52</SUP> Cada una de las especies    presenta una distribuci&oacute;n geogr&aacute;fica particular, un potencial    de colonizaci&oacute;n del ambiente dom&eacute;stico variable y, potencialmente,    una importancia epidemiol&oacute;gica distinta. Por lo anterior, <I>T. dimidiata</I>    estar&iacute;a integrada por un complejo de especies, con h&aacute;bitats y    capacidades de domiciliaci&oacute;n distintos, lo que las convierte en blancos    diferenciados para las campa&ntilde;as de control vectorial.<SUP>53,54</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> Dada la gran diversidad de ecotopos, es indispensable    el an&aacute;lisis gen&eacute;tico de las especies del complejo <I>dimidiata</I>,    a fin de esclarecer su susceptibilidad al control qu&iacute;mico y el origen    de las reinfestaciones en viviendas humanas tras intervenciones qu&iacute;micas    y comunitarias. Con el objetivo de planificar y mejorar las medidas de control    vectorial y comunitario, resulta indispensable la diferenciaci&oacute;n y reconocimiento    de cada especie y poblaci&oacute;n cr&iacute;ptica, luego de establecer no s&oacute;lo    sus caracter&iacute;sticas gen&eacute;ticas, sino en especial sus capacidades    diferenciales de invadir y al final colonizar el ambiente dom&eacute;stico.    </font></p>     <p><font size="2" face="Verdana"> Esta informaci&oacute;n ser&aacute; tambi&eacute;n    importante para analizar las variables de domesticaci&oacute;n de las especies    del complejo <I>phyllosoma</I>, tal vez descendientes del complejo<I> dimidiata</I>,    que se dispersaron al poniente y sur por el eje volc&aacute;nico en M&eacute;xico    (entre la Sierra Madre Oriental y la Occidental y al norte y sur de la costa    pac&iacute;fica).</font></p>     <p><font size="2" face="Verdana"> La aplicaci&oacute;n de distintos marcadores    gen&eacute;ticos en las principales especies del grupo <I>phyllosoma</I> muestra    una llamativa falta de diferenciaci&oacute;n, nunca antes observada en otros    complejos de especies. Mediante isoenzimas no se encontraron <I>locus</I> polim&oacute;rficos,<SUP>55,56</SUP>    ni tampoco con el an&aacute;lisis de RAPD.<SUP>57</SUP> En este &uacute;ltimo    trabajo, los 16 a 22 cebadores utilizados discriminan <I>T. pallidipennis</I>    de <I>T. longipennis</I> y <I>T. picturata</I>, mientras que hay una superposici&oacute;n    entre las dos &uacute;ltimas. Estudios comparativos de secuencias del segundo    espaciador interno (ITS-2) del ADN ribosomal muestran una variaci&oacute;n baja    . Las diferencias nucleot&iacute;dicas identificadas se encuentran entre dos    y cuatro nucle&oacute;tidos, aunque no se observaron variaciones entre <I>T.    longipennis,T. picturata,</I><SUP>17</SUP> <I>T. bassolsae,T.    pallidipennis</I> y entre <I>T. mazzottii</I> y <I>T. phyllosoma.</I><SUP>58</SUP>    Todos estos datos indican sin duda una reciente divergencia de las especies    del complejo <I>phyllosoma</I> desde un ancestro com&uacute;n. En fecha reciente,    resultados filogen&eacute;ticos mediante genes mitocondriales sugieren que <I>T.    recurva </I>pertenecer&iacute;a al complejo <I>phyllosoma</I>, emparentado de    manera estrecha con <I>T. longipennis.</I><SUP>59</SUP> Otra especie, morfol&oacute;gicamente    relacionada con <I>T. recurva</I> y no asignada a ning&uacute;n complejo, es    <I>T. gerstaeckeri</I>, una de las 10 especies vectoras m&aacute;s importantes    de M&eacute;xico.</font></p>     <p><font size="2" face="Verdana"><b>Perspectivas para el control vectorial</b></font></p>      <p><font size="2" face="Verdana">Dada la diversidad de especies de triatominos    que intervienen en la transmisi&oacute;n vectorial,<SUP>60</SUP> las medidas    de control deben ajustarse a cada situaci&oacute;n particular, para lo cual    resulta imprescindible conocer las caracter&iacute;sticas fisiol&oacute;gicas,    ecol&oacute;gicas y gen&eacute;ticas de los insectos vectores. Como se ha mencionado    ya para <I>T. infestans</I> y <I>R. prolixus</I>, los estudios gen&eacute;ticos    han permitido el reconocimiento de poblaciones muy adaptadas al ambiente dom&eacute;stico    con menor variabilidad gen&eacute;tica, lo cual las convierte en blancos muy    vulnerables y atractivos para el control qu&iacute;mico. El estudio de otras    especies parece sugerir que este fen&oacute;meno de reducci&oacute;n de la variabilidad    gen&eacute;tica parece estar m&aacute;s extendido de lo que originalmente se    pensaba. Tal ser&iacute;a el caso de las poblaciones dom&eacute;sticas de <I>R.    ecuadoriensis</I> en el norte del Per&uacute;<SUP>61</SUP> y <I>Panstrongylus    megistus</I> en el noreste de Brasil.<SUP>62</sup></font></p>     <p><font size="2" face="Verdana"> La mayor&iacute;a de las especies de triatominos    es dif&iacute;cil de controlar, ya que adem&aacute;s de presentar poblaciones    dom&eacute;sticas, conservan ecotopos silvestres, como diversas especies integrantes    de los complejos <I>dimidiata, phyllosoma, sordida, </I>y<I> brasiliensis</I>.    En estas especies se describen con frecuencia reinfestaciones de las casas a    los pocos meses del rociado con insecticidas.<SUP>40,63,64</SUP> Es fundamental    determinar cu&aacute;l es el origen de las reinfestaciones, para lo cual caben    tres posibilidades: se producen por ejemplares que sobrevivieron al rociado    (rociado mal aplicado), individuos resistentes a las intervenciones o bien la    reinfestaci&oacute;n se produce porque hay nuevas invasiones de insectos desde    otros focos silvestres y dom&eacute;sticos cercanos que no se trataron. Para    poder dise&ntilde;ar con &eacute;xito las medidas de control y vigilancia, es    indispensable discernir el origen de los individuos reinfestantes y para ello    es muy valiosa la aplicaci&oacute;n de distintos marcadores gen&eacute;ticos.<SUP>20,21</SUP>    Algunos estudios indican que si bien existe un flujo gen&eacute;tico entre h&aacute;bitat    silvestre y dom&eacute;stico, &eacute;ste es relativamente bajo y no es un obst&aacute;culo    importante para el control de las poblaciones dom&eacute;sticas a corto plazo,    aunque es necesario desarrollar estrategias complementarias para el control    de largo plazo.<SUP>65</SUP> En otros casos, el control de las poblaciones peridom&eacute;sticas    son de primordial importancia para la reducci&oacute;n de los focos dom&eacute;sticos.<SUP>66,67</SUP>    </font></p>     <p><font size="2" face="Verdana"> Un reto muy importante para la gen&eacute;tica    en relaci&oacute;n con el control es el estudio de la resistencia a insecticidas    que se ha detectado recientemente en poblaciones de <I>T. infestans</I> del    norte Argentino y Bolivia.<SUP>35</SUP> La resistencia a piretroides, fen&oacute;meno    muy extendido en otros insectos vectores como los mosquitos, es excepcional    en los triatominos. Para alcanzar el objetivo del INCOSUR de eliminar la transmisi&oacute;n    vectorial por <I>T. infestans</I> es indispensable precisar cu&aacute;les son    los mecanismos bioqu&iacute;micos y gen&eacute;ticos que generan la resistencia,    de tal manera que se evite su dispersi&oacute;n hacia otras regiones.</font></p>     <p><font size="2" face="Verdana"><i><b>Trypanosoma cruzi</b></i></font></p>      <p><font size="2" face="Verdana">Los avances recientes en gen&oacute;mica de las    infecciones parasitarias han proporcionado, como uno de los resultados m&aacute;s    espectaculares, la secuenciaci&oacute;n de los tres pat&oacute;genos de la familia    <I>Trypanosomatidae</I>, como un proyecto &uacute;nico.<SUP>7</SUP> Se espera    que el conocimiento de la secuencia completa del genoma de <I>Trypanosoma cruzi</I>    conduzca a la comprensi&oacute;n del parasitismo y la virulencia y al desarrollo    de los campos de diagn&oacute;stico y tratamiento de la enfermedad de Chagas.    </font></p>     <p><font size="2" face="Verdana"><b>Diagn&oacute;stico</b></font></p>      ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Una de las principales aplicaciones de la gen&eacute;tica    al estudio de <I>T. cruzi</I> fue resultado de la necesidad de mejorar el diagn&oacute;stico    de la infecci&oacute;n en los vectores y los hospederos mam&iacute;feros. En    particular, esto se debi&oacute; a que cualquier programa de control de la enfermedad    de Chagas tiene que dise&ntilde;arse a partir de las condiciones particulares    de prevalencia y distribuci&oacute;n de la infecci&oacute;n. Para detectar la    infecci&oacute;n por <I>T. cruzi,</I> ha sido necesario emplear sobre todo dos    herramientas diagn&oacute;sticas: los m&eacute;todos serol&oacute;gicos y los    m&eacute;todos parasitol&oacute;gicos. Al considerar la evoluci&oacute;n de    la infecci&oacute;n en los hospederos humanos, la permanencia de los par&aacute;sitos    en la circulaci&oacute;n sangu&iacute;nea por muy corto tiempo despu&eacute;s    de su entrada, su localizaci&oacute;n en tejidos de dif&iacute;cil acceso y    la escasa cantidad de ellos en relaci&oacute;n con el volumen de sangre con    el tiempo y seg&uacute;n la etapa de la enfermedad, es claro que el diagn&oacute;stico    tradicional parasitol&oacute;gico (y todav&iacute;a de primera l&iacute;nea    en algunos pa&iacute;ses) por microscopia carece de sensibilidad.<SUP>68</SUP>    El uso de la reacci&oacute;n en cadena de la polimerasa (PCR) para detectar    la presencia del par&aacute;sito es la herramienta m&aacute;s usada como m&eacute;todo    molecular de diagn&oacute;stico, con la ventaja adicional de que aun cuando    se encuentre en diminutas cantidades, el ADN del par&aacute;sito se puede amplificar.    Estos ensayos han utilizado gran variedad de iniciadores para amplificar diversos    genes: desde el ADN del cinetoplasto<SUP>69</SUP> hasta fragmentos de genes    nucleares, incluidas secuencias nucleares repetitivas,<SUP>70,71</SUP> una secuencia    que codifica a una prote&iacute;na flagelar<SUP>72</SUP> y combinaciones de    secuencias en PCR multiplex.<SUP>73,74</SUP> Esta metodolog&iacute;a ha sido    efectiva en la detecci&oacute;n de casos agudos y cr&oacute;nicos de la enfermedad    y ha mostrado consistencia con las pruebas serol&oacute;gicas<SUP>75-78 </SUP>y    la detecci&oacute;n de infecci&oacute;n de vectores.<SUP>77,79,10</SUP> Se ha    realizado incluso la medici&oacute;n de las fluctuaciones en la parasitemia    durante la infecci&oacute;n cr&oacute;nica mediante PCR cuantitativa.<SUP>80</SUP>    Con la publicaci&oacute;n de la secuenciaci&oacute;n del genoma de <I>T. cruzi,</I>    puede preverse que los m&eacute;todos de diagn&oacute;stico moleculares adquieran    mayor oportunidad de desarrollo, siempre que se identifiquen genes del par&aacute;sito    particulares para el diagn&oacute;stico o el seguimiento del tratamiento.</font></p>     <p><font size="2" face="Verdana"> Las dificultades para establecer procedimientos    est&aacute;ndares y asegurar la sensibilidad del diagn&oacute;stico parasitol&oacute;gico    con PCR han propiciado el uso universal del diagn&oacute;stico serol&oacute;gico    para detectar la infecci&oacute;n humana. Los ensayos actuales principales son    la inmunofluorescencia indirecta (IFI), los ensayos enzim&aacute;ticos inmunoadsorbentes    (ELISA) y el <I>Western blot</I>, los cuales se basan en la detecci&oacute;n    de anticuerpos generados por la presencia del par&aacute;sito.<SUP>1</SUP> Varios    m&eacute;todos bioqu&iacute;micos y moleculares se han utilizado para purificar    y caracterizar los ant&iacute;genos inmunodominantes principales, con el objetivo    de mejorar la sensibilidad y la especificidad de las pruebas diagn&oacute;sticas    serol&oacute;gicas.<SUP>81-83</SUP> Sin embargo, no existe un consenso universal    para ellas y se ha debatido tambi&eacute;n el hecho de que la diversidad gen&eacute;tica    de las cepas por &aacute;rea geogr&aacute;fica y los linajes del par&aacute;sito    pueden ser factores que determina la sensibilidad.<SUP>84</SUP> Las t&eacute;cnicas    moleculares han permitido contar con prote&iacute;nas recombinantes del par&aacute;sito    para utilizarlas en las pruebas serol&oacute;gicas y evitar los procesos de    cultivo, extracci&oacute;n y purificaci&oacute;n de ant&iacute;genos. De este    modo se ha disminuido el tiempo invertido en los ensayos y la variaci&oacute;n    en la composici&oacute;n del ant&iacute;geno de un lote a otro. Los resultados    de los ensayos con prote&iacute;nas recombinantes no difieren estad&iacute;sticamente    respecto de los realizados con extractos de par&aacute;sitos, al menos no en    seis pa&iacute;ses de Latinoam&eacute;rica.<SUP>85-89</sup></font></p>     <p><font size="2" face="Verdana"> Los ensayos para diagn&oacute;stico de la nueva    generaci&oacute;n parecen ser los microarreglos; estas plataformas tienen el    potencial de realizar diagn&oacute;sticos de enfermedades infecciosas diferenciales    altamente espec&iacute;ficos, por lo que el n&uacute;mero de aplicaciones excede    en mucho el disponible por cualquier otra metodolog&iacute;a conocida.<SUP>90,91</SUP>    En el caso de las enfermedades infecciosas, esta plataforma ha permitido por    ejemplo el estudio poblacional y patrones de resistencia de la tuberculosis.<SUP>92</SUP>    Se ha propuesto incluso detectar, mediante una sola prueba, cualquier microorganismo    perteneciente a un grupo reci&eacute;n nombrado (<I>Panmicrobial database</I>)    que incluye 29495 especies diferentes.<SUP>93</SUP> Esto es posible debido a    que en un espacio de 70 mm X 20 mm es posible acomodar 244 000 oligonucle&oacute;tidos    que funcionan como sondas para la detecci&oacute;n de los microorganismos (de    los cuales provienen las sondas), en muestras de sangre, exudados far&iacute;ngeos,    orina y otros tejidos. A partir de estos tejidos se extrae el ARN y &eacute;ste    se incuba con los portaobjetos que llevan las sondas; las hibridaciones se detectan    por fluorescencia.<SUP>93</sup></font></p>     <p><font size="2" face="Verdana"> Si se considera la necesidad de mejorar el diagn&oacute;stico    de la enfermedad de Chagas y la disponibilidad de secuencias identificadas como    genes verdaderos de la superficie del par&aacute;sito, esta metodolog&iacute;a    podr&iacute;a posibilitar lo siguiente:</font></p> <DIR>      <p><font size="2" face="Verdana">1. Detectar infecciones agudas con una sola prueba    com&uacute;n, sobre todo en los casos pedi&aacute;tricos, los cuales presentan    por lo general baja respuesta de anticuerpos.</font></p>     <p><font size="2" face="Verdana">2. Realizar el seguimiento de los pacientes tratados    para evaluar la eliminaci&oacute;n del par&aacute;sito y la evoluci&oacute;n    de su respuesta inmunitaria posterior al tratamiento.</font></p>     <p><font size="2" face="Verdana">3. Efectuar una evaluaci&oacute;n r&aacute;pida    de los casos sospechosos por datos cl&iacute;nicos en las unidades de atenci&oacute;n    primaria con la finalidad de iniciar el tratamiento de manera inmediata de los    casos agudos (antes de seis meses). En la actualidad, el resultado de una prueba    de Chagas puede tardar entre 6 y 12 meses en llegar a la cl&iacute;nica de origen    de la muestra. </font></p>     <p><font size="2" face="Verdana">4. Realizar la detecci&oacute;n r&aacute;pida    de transmisi&oacute;n cong&eacute;nita, ya que ser&aacute; posible diferenciar    la respuesta inmunitaria de la madre del ni&ntilde;o. Hoy en d&iacute;a se requiere    un periodo de nueve meses de espera antes de contar con un diagn&oacute;stico    serol&oacute;gico v&aacute;lido, para descartar la detecci&oacute;n de anticuerpos    maternos en el infante. En estos casos, la detecci&oacute;n molecular del par&aacute;sito    puede ser de utilidad, si bien necesita la preservaci&oacute;n de la sangre,    el transporte a un laboratorio especializado y la utilizaci&oacute;n de t&eacute;cnicas    complejas y reactivos de dif&iacute;cil conservaci&oacute;n.</font></p>     <p><font size="2" face="Verdana">5. Practicar el tamizaje r&aacute;pido de los    migrantes (provenientes de zonas end&eacute;micas hacia pa&iacute;ses sin transmisi&oacute;n    vectorial).</font></p>     <p><font size="2" face="Verdana">6. Instituir un sistema mejorado de tamizaje    de bancos de sangre. Los falsos positivos frecuentes con los m&eacute;todos    de diagn&oacute;stico comerciales en uso actual disminuyen la cantidad efectiva    de unidades disponibles para la transfusi&oacute;n, situaci&oacute;n delicada    en los pa&iacute;ses en los que la cultura de donaci&oacute;n de sangre no es    ampliamente compartida.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">7. Desarrollar una prueba serol&oacute;gica sencilla    que requiere equipo m&iacute;nimo , en un formato a prueba de humedad y temperatura    elevadas, condiciones frecuentes en las zonas end&eacute;micas.</font></p> </DIR>     <p>&nbsp;</p>      <p><font size="2" face="Verdana"><b>Tratamiento farmacol&oacute;gico</b></font></p>      <p><font size="2" face="Verdana">Los dos medicamentos que se utilizan en la actualidad    para el control parasitario de la enfermedad de Chagas han estado en uso por    m&aacute;s de 40 a&ntilde;os: nifurtimox y benznidazol. Ninguno de ellos es    efectivo en la totalidad de los casos en los que se han aplicado y para ambos    se han notificado efectos adversos graves.<SUP>94</SUP> El Grupo Cient&iacute;fico    de Trabajo de la OPS ha reconocido que los f&aacute;rmacos disponibles para    el control de la infecci&oacute;n no son los ideales y que se desconoce si &eacute;stos    pueden detener el progreso de la enfermedad.<SUP>95</SUP> Esta percepci&oacute;n    de ausencia de medicamentos eficaces para el control de la infecci&oacute;n    ha promovido el desarrollo de nuevas formulaciones, tras tomar como blancos    a las mol&eacute;culas que participan en las v&iacute;as metab&oacute;licas    del par&aacute;sito que difieren de las existentes en los mam&iacute;feros.    Dentro de estos estudios, destaca el uso de los inhibidores de las proteasas    de ciste&iacute;na con efectos directos sobre la cruzipa&iacute;na, esencial    para el crecimiento del par&aacute;sito.<SUP>96,97</SUP> Se han reportado los    inhibidores de la bios&iacute;ntesis de esteroles, indispensables para la formaci&oacute;n    de membranas del par&aacute;sito, como agentes con excelentes propiedades farmacocin&eacute;ticas:    concentraciones m&iacute;nimas inhibitorias, alto volumen de distribuci&oacute;n,    vida media larga y una extensa distribuci&oacute;n en tejidos; asimismo, su    farmacodinamia es excelente y tiene pocos (en algunos casos nulos) efectos adversos.<SUP>98-100</SUP>    Los flavonoides aislados de plantas, de los cuales se desconoce el mecanismo    de acci&oacute;n, son compuestos relacionados estructuralmente que han probado    su eficacia <I>invitro </I>e<I> in vivo</I> contra <I>T. cruzi.</I><SUP>101</SUP>    Los inhibidores de algunos metabolitos intermediarios del metabolismo de los    amino&aacute;cidos, en especial la enzima cinasa de arginina,<SUP>102</SUP>    los inhibidores de la reductasa de dihidrofolato,<SUP>103</SUP> los inhibidores    de la transialidasa, un factor de virulencia que induce la apoptosis de las    c&eacute;lulas inmunitarias,<SUP>104</SUP> son otros ejemplos de mol&eacute;culas    propuestas como blancos para el dise&ntilde;o de medicamentos para controlar    la infecci&oacute;n. Aunque hasta la fecha las mol&eacute;culas propuestas como    medicamentos no han sido productos de los an&aacute;lisis gen&eacute;ticos funcionales,    la tecnolog&iacute;a derivada de la prote&oacute;mica permitir&aacute; el tamizaje    de estas mol&eacute;culas con actividad tripanocida a fin de detectar cambios    en los patrones de expresi&oacute;n de prote&iacute;nas en respuesta a la exposici&oacute;n    de f&aacute;rmacos como en el caso documentado de <I>Plasmodium.</I><SUP>105</sup></font></p>     <p><font size="2" face="Verdana"> El avance del conocimiento en la fisiolog&iacute;a    y metabolismo de <I>T. cruzi</I> derivado de la atribuci&oacute;n de funciones    a los genes secuenciados en el proyecto Tritryps, adem&aacute;s de la tecnolog&iacute;a    desarrollada para el procesamiento de muestras a gran escala y tamizajes funcionales    (<I>high throughput screening</I>), ser&aacute;n herramientas valiosas para    el dise&ntilde;o de nuevos medicamentos, con efectividad para cada fase de la    enfermedad y con los menores efectos secundarios.<SUP>7,106</SUP> </font></p>     <p><font size="2" face="Verdana"><b>Gen&eacute;tica de poblaciones</b></font></p>      <p><font size="2" face="Verdana">La caracterizaci&oacute;n de las poblaciones    heterog&eacute;neas de <I>T. cruzi</I> ha evolucionado desde el estudio de las    isoenzimas hasta la determinaci&oacute;n de marcadores moleculares (rDNA, microsat&eacute;lites,    miniexones, etc.) espec&iacute;ficos para determinar los linajes, los grupos    y por &uacute;ltimo las unidades discretas de tipificaci&oacute;n (<I>discrete    typing units</I>, DTU) que fueron fundamentales para la identificaci&oacute;n    de los seis subgrupos: Tc I, Tc IIa-Iie.<SUP>107-110</SUP> </font></p>     <p><font size="2" face="Verdana"> Se presupone que los patrones epidemiol&oacute;gicos    y los diversos perfiles cl&iacute;nicos observados en los individuos con la    enfermedad de Chagas se correlacionan s&oacute;lidamente con la gen&eacute;tica    de los hospederos y la gran variabilidad encontrada en las poblaciones de par&aacute;sitos;    en realidad, existen estudios que comprueban que ambos factores son determinantes    para la evoluci&oacute;n de la enfermedad.<SUP>111</SUP> El an&aacute;lisis    mediante marcadores gen&eacute;ticos sugiere que la especie <I>T. cruzi</I>    es en verdad un complejo de subespecies, correspondientes a los grupos I y II    y que tienen variabilidad intraespec&iacute;fica y coherencia entre la diversidad    gen&eacute;tica, la patogenicidad y el tropismo.<SUP>110,112</SUP> Se ha observado    que los par&aacute;sitos del grupo II (Tc II) tienen relaci&oacute;n preferencial    con los mam&iacute;feros placentarios y, en particular, con las infecciones    humanas, por lo que es frecuente en los casos cr&oacute;nicos. <I>Trypanosoma    cruzi </I>grupo I de Sudam&eacute;rica est&aacute; vinculado con infecciones    humanas asintom&aacute;ticas e infecciones de vectores y reservorios de &aacute;rea    selv&aacute;tica en Brasil.<SUP>113</SUP> Esta situaci&oacute;n es diferente    en otras regiones; en los pa&iacute;ses andinos, por ejemplo, Tc I puede encontrarse    en los ciclos dom&eacute;sticos<SUP>111</SUP> y en M&eacute;xico las cepas de    par&aacute;sitos detectados en pacientes con cardiopat&iacute;as y megas&iacute;ndromes,    en los reservorios silvestres y en los vectores, muestran diversidad pero la    mayor&iacute;a pertenecen al linaje TcI.<SUP>114,115</SUP> Aun cuando se ha    empleado una gran diversidad de marcadores moleculares para determinar la estructura    gen&eacute;tica de las poblaciones de <I>T. cruzi</I>, todav&iacute;a no se    tiene el panorama completamente definido y no han dejado de aparecer aislados    del par&aacute;sito que no se ajustan a ninguno de los dos grupos o que tienen    caracter&iacute;sticas de ambos, en t&eacute;rminos gen&eacute;ticos y funcionales.<SUP>116</SUP>    Es necesario contar con un sistema de tipificaci&oacute;n que sea confiable    para clasificar a las poblaciones de par&aacute;sitos con la finalidad de optimizar    las medidas de control y designar elementos de diagn&oacute;stico y pron&oacute;stico    para las manifestaciones cl&iacute;nicas de la enfermedad de Chagas.</font></p>     <p><font size="2" face="Verdana"><b>Interacci&oacute;n de <i>Trypanosoma cruzi</i>  con sus hospederos</b></font></p>      <p><font size="2" face="Verdana">Se ha propuesto que la patolog&iacute;a de la    enfermedad de Chagas puede ser efecto de la persistencia del par&aacute;sito    y compuestos derivados de &eacute;ste dentro del hospedero<SUP>117-120</SUP>    y de la reacci&oacute;n inmunitaria ocasionada por la infecci&oacute;n, pero    que de manera descontrolada reacciona contra las c&eacute;lulas propias del    hospedero.<SUP>121</SUP> En particular, el perfil cl&iacute;nico de cada individuo    es el resultado de un conjunto de interacciones complejas, entre las cuales    se encuentran el fondo gen&eacute;tico del hospedero, los factores ambientales    y sociales y la composici&oacute;n gen&eacute;tica del par&aacute;sito, todo    lo cual se complica en las infecciones mixtas y las re-infecciones.<SUP>122</SUP>    El par&aacute;sito <I>T. cruzi </I>tiene contacto con varios tipos celulares    dentro de los hospederos humanos: c&eacute;lulas epiteliales, musculares, cardiacas,    nerviosas e intestinales; todas ellas, por lo tanto, tienen alg&uacute;n grado    de interacci&oacute;n con el par&aacute;sito. Se ha mostrado que la capacidad    de invadir a las c&eacute;lulas y multiplicarse en ellas es el primer factor    que interviene como determinante para el establecimiento de una infecci&oacute;n    por <I>T. cruzi</I>, dado que no todas las cepas o aislados del par&aacute;sito    se comportan de igual manera con diferentes tipos celulares, tanto <I>in vitro</I>    como <I>in </I>vivo.<SUP>123</SUP> Todav&iacute;a no se ha establecido la base    molecular que explique este comportamiento. Se ha estudiado el efecto de poseer    un particular tipo de complejo principal de compatibilidad (MHC) con la regulaci&oacute;n    de la respuesta inmunitaria a la infecci&oacute;n por <I>T. cruzi</I> y al da&ntilde;o    cardiaco. Se ha encontrado que los pacientes que desarrollan miocardiopat&iacute;as    presentan una frecuencia aumentada de HLA-DR16 en comparaci&oacute;n con los    individuos asintom&aacute;ticos. Los sujetos con los tipos HLA-DR4 y HLA-B39    parecen ser m&aacute;s susceptibles a la infecci&oacute;n por <I>T. cruzi</I>.<SUP>124</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> En el estudio de las interacciones del par&aacute;sito    con su c&eacute;lula hospedera se ha descrito que la interacci&oacute;n del    tripomastigote con los lisosomas de la c&eacute;lula es indispensable para su    crecimiento y multiplicaci&oacute;n como amastigote.<SUP>125</SUP> Tambi&eacute;n    cabe mencionar el papel de la transialidasa en la infecci&oacute;n de las c&eacute;lulas,    su papel como mediadora de la obtenci&oacute;n de mol&eacute;culas del hospedero    por el par&aacute;sito y sus efectos inmunosupresores,<SUP>126</SUP> mientras    que al producto del gene<I> lyt1</I> se le atribuye una funci&oacute;n esencial    sobre la invasi&oacute;n del par&aacute;sito y su propiedad hemol&iacute;tica.<SUP>127</SUP>    El proceso de invasi&oacute;n se revis&oacute; en fecha reciente y est&aacute;    documentado el papel indispensable de las glucoprote&iacute;nas de la familia    de las mucinas en la invasi&oacute;n por los tripomastigotes.<SUP>128,129</SUP>    El reporte de la secuenciaci&oacute;n del genoma de <I>T. cruzi</I> indica que    un alto porcentaje de los genes secuenciados pertenece a esta familia.<SUP>7</sup></font></p>     <p><font size="2" face="Verdana"> La generaci&oacute;n de este conocimiento de    interacciones se ha utilizado en particular en el dise&ntilde;o de vacunas contra    la infecci&oacute;n por <I>T. cruzi</I> o el desarrollo de la enfermedad. Existen    pocos estudios que muestren la utilizaci&oacute;n de mol&eacute;culas como generadoras    de protecci&oacute;n en mam&iacute;feros; empero, se ha descrito que el tipo    de respuesta que podr&iacute;a proteger a los mam&iacute;feros de la enfermedad    debe ser Th1;<SUP>130-132</SUP> tambi&eacute;n se ha se&ntilde;alado que el    agotamiento de cualquiera de los dos tipos celulares activos en la reacci&oacute;n    inmunitaria incrementa la susceptibilidad del hospedero a la infecci&oacute;n.<SUP>133</SUP>    Se han identificado ep&iacute;topes que podr&iacute;an utilizarse en el dise&ntilde;o    de p&eacute;ptidos sint&eacute;ticos como ant&iacute;genos de inmunizaci&oacute;n    contra el desarrollo del par&aacute;sito, tales como los ep&iacute;topes que    generan respuestas de linfocitos T CD8+.<SUP>134</SUP> La utilizaci&oacute;n    de vectores de DNA que contienen genes que codifican a prote&iacute;nas del    par&aacute;sito es efectiva para la protecci&oacute;n contra el establecimiento    de la infecci&oacute;n por <I>T. cruzi</I>; dentro de estos genes se incluyen    la prote&iacute;na de superficie de amastigote 2 y la transialidasa.<SUP>133,135-137</sup></font></p>     <p><font size="2" face="Verdana"> En la b&uacute;squeda de alternativas de control    de la enfermedad se ha comunicado la utilizaci&oacute;n de la metodolog&iacute;a    del ARN interferente para bloquear la expresi&oacute;n de las mol&eacute;culas    de las c&eacute;lulas de mam&iacute;fero que act&uacute;an como receptores o    ligandos para el par&aacute;sito y con ello evitar la infecci&oacute;n de las    c&eacute;lulas. Tal es el caso de dos mol&eacute;culas constituyentes de la    matriz extracelular de las c&eacute;lulas de mam&iacute;fero: laminina g<SUB>1</SUB>    y trombospondina 1, cuyo bloqueo de expresi&oacute;n evit&oacute; la invasi&oacute;n    de c&eacute;lulas humanas en cultivo por el par&aacute;sito.<SUP>138-140</SUP>    La disponibilidad de bases de datos gen&eacute;ticos para <I>T. cruzi</I> y    los productos de la secuenciaci&oacute;n del genoma har&aacute;n posible la    b&uacute;squeda de nuevas mol&eacute;culas que cumplan con las caracter&iacute;sticas    de generar respuestas inmunitarias protectoras o cambios en el comportamiento    de los par&aacute;sitos dentro de los hospederos humanos, no siempre contra    la infecci&oacute;n, sino en contra de la devastaci&oacute;n de la enfermedad    cr&oacute;nica y para evitar la propagaci&oacute;n del par&aacute;sito a otros    hospederos humanos, lo cual contribuir&aacute; as&iacute; a controlar la enfermedad    de Chagas.</font></p>     <p><font size="2" face="Verdana"><I>Trypanosoma cruzi</i> pasa por dos etapas    de diferenciaci&oacute;n y una proliferativa dentro del tracto digestivo del    insecto vector.<SUP>141-142</SUP> En particular, la &uacute;ltima diferenciaci&oacute;n    da lugar a los tripomastigotes metac&iacute;clicos, que constituyen la fase    infectante para el hombre y otros mam&iacute;feros. <I>In vitro</I>, la transformaci&oacute;n    de amastigotes en epimastigotes (primera diferenciaci&oacute;n) parece ser reversible    y estar controlada por la concentraci&oacute;n de glucosa.<SUP>143</SUP> Esta    dependencia puede relacionarse con la presencia de glucosidasas que degradan    carbohidratos complejos presentes en la dieta, con la liberaci&oacute;n consecuente    de carbohidratos simples.<SUP>144</SUP> La segunda diferenciaci&oacute;n, la    metaciclog&eacute;nesis, ocurre en el recto del insecto y tiene como requisito    la adhesi&oacute;n del par&aacute;sito a este tejido para iniciar el proceso.    Se han informado diversos estudios con el objetivo de dilucidar mol&eacute;culas    o receptores de adhesi&oacute;n que intervienen en la metaciclog&eacute;nesis    y conocer c&oacute;mo el par&aacute;sito sobrevive dentro del ambiente del tracto    digestivo del triatomino. Dentro de ellos, se ha propuesto que las enzimas de    digesti&oacute;n no afectan al par&aacute;sito, ya que existen experimentos    que prueban que las catepsinas, enzimas de digesti&oacute;n en <I>Rhodnius prolixus</I>    y que se expresan en todos las etapas de desarrollo,<SUP>145</SUP> no muestran    cambios de expresi&oacute;n entre insectos infectados y no infectados.<SUP>146,147</SUP>    Existen reportes que hablan de la presencia de mol&eacute;culas que regulan    la din&aacute;mica de multiplicaci&oacute;n y transformaci&oacute;n de <I>T.    cruzi</I> dentro del vector, como el factor hemol&iacute;tico del buche de <I>R.    prolixus</I> que parece seleccionar a las cepas de <I>T. cruzi</I> y que se    desarrollan en &eacute;l; as&iacute; como los p&eacute;ptidos derivados de la    hemoglobina y las lectinas del buche y el intestino.<SUP>148</SUP> Los epimastigotes    se unen tanto a la superficie del buche como del intestino, pero la diferenciaci&oacute;n    de los par&aacute;sitos depende de la adhesi&oacute;n al recto.<SUP>149</SUP>    Los niveles de expresi&oacute;n del gen de la lisozima dentro del tracto digestivo    var&iacute;an y es menor en el intestino, por lo que podr&iacute;a favorecerse    la presencia de par&aacute;sitos en ese &oacute;rgano.<SUP>150</SUP> La defensina    A de <I>R. prolixus</I> existe en altas concentraciones en la hemolinfa (donde    no sobreviven bacterias) pero no as&iacute; en el intestino, donde matar&iacute;a    a los simbiontes de los cuales depende su supervivencia, por lo cual los par&aacute;sitos    no se ven afectados.<SUP>151</SUP> Estos reportes sugieren que existen factores    dentro del intestino exclusivos de los insectos alimentados que favorecen la    multiplicaci&oacute;n y diferenciaci&oacute;n de los par&aacute;sitos <I>in    vivo</I>.<SUP>152-154</SUP> Se ha propuesto que el par&aacute;sito compite con    su vector por los nutrientes y por tanto la frecuencia de alimento condiciona    la densidad de la poblaci&oacute;n de par&aacute;sitos, as&iacute; como los    porcentajes de cada fase de desarrollo en el recto del insecto.<SUP>155</SUP>    El mismo grupo de investigaci&oacute;n que realiz&oacute; el trabajo anterior    describe que es posible que la diuresis y no los factores de la hemolinfa o    los productos de digesti&oacute;n de la hemoglobina induzcan la metaciclog&eacute;nesis    de <I>T. </I>cruzi.<SUP>156</SUP> Un elemento com&uacute;n entre los reportes    de estos estudios es la discusi&oacute;n acerca de que la metaciclog&eacute;nesis    es altamente compleja y que hace falta mucha m&aacute;s investigaci&oacute;n    sobre el fen&oacute;meno y herramientas m&aacute;s eficaces y precisas para    dilucidar todos los factores que participan en el proceso.</font></p>     <p><font size="2" face="Verdana"><b>Perspectivas para el conocimiento sobre la gen&eacute;tica  de<I> T. cruzi </I>y los triatominos</b></font></p>      <p><font size="2" face="Verdana">El uso de las herramientas de la gen&eacute;tica    de <I>T. cruzi</I> puede aplicarse para identificar las mol&eacute;culas participantes    en el reconocimiento, sistemas de se&ntilde;alizaci&oacute;n y en general para    conocer las interacciones espec&iacute;ficas dentro del vector, todo ello dentro    del marco de evidencia que conduzca al dise&ntilde;o de nuevos m&eacute;todos    de control de la enfermedad de Chagas. En este sentido, pueden proponerse algunas    l&iacute;neas de investigaci&oacute;n necesarias: a) la utilizaci&oacute;n de    vacunas veterinarias en animales dom&eacute;sticos en contra de componentes    esenciales del vector para el desarrollo de los par&aacute;sitos, de tal manera    que al evitar la diferenciaci&oacute;n de los par&aacute;sitos, estos animales    dom&eacute;sticos dejen de funcionar como reservorios y riesgo para la transmisi&oacute;n;    b) la generaci&oacute;n de vacunas humanas contra las prote&iacute;nas que el    par&aacute;sito presenta dentro del vector, con bloqueo consecuente de la diferenciaci&oacute;n    de los par&aacute;sitos dentro del insecto y la interrupci&oacute;n de la transmisi&oacute;n,    lo que ser&iacute;a una medida altruista, dado que la persona vacunada no estar&iacute;a    protegida contra la infecci&oacute;n, sino que evitar&iacute;a que otros se    infectaran; y c) la generaci&oacute;n de triatominos transg&eacute;nicos, en    los cuales se modifiquen por ingenier&iacute;a gen&eacute;tica las mol&eacute;culas    con las que el par&aacute;sito interact&uacute;a como requisito para su desarrollo,    de tal modo que los insectos sean resistentes a la infecci&oacute;n por <I>T.    cruzi.</i></font></p>     <p><font size="2" face="Verdana"> La expectativa primaria, despu&eacute;s de la    secuencia de los genomas de los organismos etiol&oacute;gicos y vectores de    la enfermedad de Chagas, se basa en contar con un acervo de elementos que permitan    no s&oacute;lo identificar a los individuos infectados sino establecer un pron&oacute;stico    de la enfermedad de acuerdo con las caracter&iacute;sticas gen&eacute;ticas    que presente la poblaci&oacute;n del par&aacute;sito, incidir en el desarrollo    de la infecci&oacute;n para evitar los da&ntilde;os de la enfermedad cr&oacute;nica    y evitar la propagaci&oacute;n de la enfermedad por medio de la prevenci&oacute;n    de la infecci&oacute;n en hospederos dom&eacute;sticos. Asimismo, marcadores    de genoma permitir&aacute;n analizar la gen&eacute;tica poblacional del vector    y su asociaci&oacute;n con la modificaci&oacute;n, adaptaci&oacute;n y conectividad    ecol&oacute;gica del h&aacute;bitat, factores claves para la exposici&oacute;n    y el riesgo de transmisi&oacute;n del par&aacute;sito y, por lo tanto, de la    enfermedad.<SUP>157</sup></font></p>     <p><font size="2" face="Verdana"><b>Agradecimientos</b></font></p>      <p><font size="2" face="Verdana">Este trabajo se realiz&oacute; gracias a la colaboraci&oacute;n    de varios grupos de investigaci&oacute;n integrantes de la red ECLAT bajo la    coordinaci&oacute;n del Dr. C.J. Schofield. Este trabajo recibi&oacute; apoyo    econ&oacute;mico de las siguientes instituciones: OPS/OMS (proyectos No. OMS    A50674 y OMS A30448); CONACYT de M&eacute;xico (FOMIX-Morelos: Proyecto No.    2004-CO2-012), "Comisi&oacute;n Sectorial de Investigaci&oacute;n Cient&iacute;fica"    (CSIC) de Uruguay y del Instituto Nacional de Salud P&uacute;blica de M&eacute;xico.</font></p>     <p>&nbsp;</p>     ]]></body>
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Ibarra-Cerde&ntilde;a CN, S&aacute;nchez    Cordero V, Towsend-Peterson A, Ramsey JM. Ecology of North American Triatominae.    Acta Trop 2009;110(2-3):178-186.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=9449040&pid=S0036-3634200900090000700157&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Fecha de recibido: 28 de julio de 2008        <br>   Fecha de aceptado: 25 de marzo de 2009</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana">Solicitud de sobretiros: Dra. Janine Ramsey.   Centro Regional de Investigaci&oacute;n en Salud P&uacute;blica.    Instituto Nacional de Salud P&uacute;blica 4&ordf;.    Norte esq. 19&ordf;.    Poniente s/n. col. Centro.    30700, Tapachula, Chiapas, M&eacute;xico.  Correo electr&oacute;nico: <A HREF="mailto:jramsey@insp.mx">jramsey@insp.mx</A></font></p>      ]]></body><back>
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