<?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>0120-4157</journal-id>
<journal-title><![CDATA[Biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Biomédica]]></abbrev-journal-title>
<issn>0120-4157</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-41572013000500018</article-id>
<article-id pub-id-type="doi">10.7705/biomedica.v33i0.1466</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Rickettsiosis transmitidas por garrapatas en las Américas: avances clínicos y epidemiológicos, y retos en el diagnóstico]]></article-title>
<article-title xml:lang="en"><![CDATA[Tick-borne rickettsioses in the Americas: clinical and epidemiological advances, and diagnostic challenges]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo]]></surname>
<given-names><![CDATA[Marylin]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Faccini-Martínez]]></surname>
<given-names><![CDATA[Álvaro A]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valbuena]]></surname>
<given-names><![CDATA[Gustavo]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Pontificia Universidad Javeriana Facultad de Ciencias Departamento de Microbiología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Pontificia Universidad Javeriana University of Texas Medical Branch Pathology Department]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<volume>33</volume>
<fpage>161</fpage>
<lpage>178</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-41572013000500018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-41572013000500018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-41572013000500018&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las rickettsiosis son entidades clínicas de tipo zoonótico, causadas por bacterias intracelulares estrictas de los géneros Rickettsia y Orientia, pertenecientes a la familia Rickettsiaceae. Su ecología está determinada por factores ambientales y la presencia de vectores específicos que condicionan el establecimiento y la epidemiología en diferentes regiones del mundo. En las Américas, durante el siglo XX, únicamente eran reconocidas tres de estas enfermedades: la fiebre manchada de las Montañas Rocosas, el tifus epidémico y el tifus endémico, Sin embargo, a partir del año 2000 se han descrito mas de 10 especies diferentes previamente desconocidas en este continente, tanto en artrópodos como en casos clínicos, hecho que permite clasificarlas como entidades clínicas emergentes y reemergentes. Dadas las manifestaciones clínicas de las enfermedades causadas por rickettsias, siendo la gran mayoría inespecíficas y, por lo mismo, compartidas con otras enfermedades infecciosas, especialmente virales y bacterianas, han sido enmarcadas entre los diagnósticos diferenciales del síndrome febril agudo, tanto en áreas urbanas como tropicales. En la actualidad, se cuenta con métodos diagnósticos directos e indirectos, que son útiles en la identificación del agente infeccioso, en este caso, causante de rickettsiosis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Rickettsioses are a group of zoonotic diseases caused by strict intracellular bacteria of the genus Rickettsia and Orientia which belong to the Rickettsiaceae family. Their ecology is influenced by environmental factors and the presence of specific vectors that determine the establishment and epidemiology in different world regions. In America, during the 20 th century, only three of these diseases were recognized: Rocky Mountain spotted fever, epidemic typhus and endemic typhus. However, since 2000, more than 10 different species that had previously been unknown in this continent have been described, both in arthropods and in clinical cases, fact that classifies them as emerging and re-emerging diseases. Given the clinical manifestations of the diseases caused by rickettsias, being the majority unspecific and, therefore, shared with other infectious diseases, especially viral and bacterial, they have been framed within the differential diagnoses of acute febrile syndrome in urban and tropical areas. Nowadays, there are direct and indirect diagnostic methods, which are useful in the definition of the infectious agent, in this case, the cause of rickettsioses.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Rickettsia]]></kwd>
<kwd lng="es"><![CDATA[Américas]]></kwd>
<kwd lng="es"><![CDATA[infecciones por Rickettsia]]></kwd>
<kwd lng="es"><![CDATA[epidemiología]]></kwd>
<kwd lng="es"><![CDATA[diagnéstico]]></kwd>
<kwd lng="es"><![CDATA[zoonosis]]></kwd>
<kwd lng="en"><![CDATA[Rickettsia]]></kwd>
<kwd lng="en"><![CDATA[Americas]]></kwd>
<kwd lng="en"><![CDATA[Rickettsia infections]]></kwd>
<kwd lng="en"><![CDATA[epidemiology]]></kwd>
<kwd lng="en"><![CDATA[diagnosis]]></kwd>
<kwd lng="en"><![CDATA[zoonoses]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p> ART&Iacute;CULO ORIGINAL</p>      <p>doi: <a href="http://dx.doi.org/10.7705/biomedica.v33i0.1466" target="_blank">http://dx.doi.org/10.7705/biomedica.v33i0.1466</a></p>      <p><font size="4">    <center><b>Rickettsiosis transmitidas por garrapatas en las Am&eacute;ricas: avances cl&iacute;nicos y epidemiol&oacute;gicos, y retos en el diagn&oacute;stico</b></center></font></p>      <p>    <center>Marylin Hidalgo <sup>1</sup>, &Aacute;lvaro A. Faccini-Mart&iacute;nez <sup>1</sup>, Gustavo Valbuena <sup>2</sup></center></p>      <p><sup>1</sup> Grupo de Enfermedades Infecciosas, Departamento de Microbiolog&iacute;a, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogot&aacute;, D.C., Colombia </p>      <p><sup>2</sup> Pathology Department, University of Texas Medical Branch, Texas, USA </p>      <p><b>Contribuci&oacute;n de los autores: </b></p>      ]]></body>
<body><![CDATA[<p>&Aacute;lvaro Adolfo Faccini se encarg&oacute; de la revisi&oacute;n de la literatura cient&iacute;fica y la redacci&oacute;n del manuscrito. </p>      <p>Marylin Hidalgo y Gustavo Valbuena asesoraron la revisi&oacute;n, sugirieron modificaciones de estilo y corrigieron el manuscrito. </p>      <p>Recibido: 20/11/12; aceptado:02/03/13</p>    <hr size=1>      <p>Las rickettsiosis son entidades cl&iacute;nicas de tipo zoon&oacute;tico, causadas por bacterias intracelulares estrictas de los g&eacute;neros <i>Rickettsia </i>y <i>Orientia</i> , pertenecientes a la familia Rickettsiaceae. Su ecolog&iacute;a est&aacute; determinada por factores ambientales y la presencia de vectores espec&iacute;ficos que condicionan el establecimiento y la epidemiolog&iacute;a en diferentes regiones del mundo. </p>      <p>En las Am&eacute;ricas, durante el siglo XX, &uacute;nicamente eran reconocidas tres de estas enfermedades: la fiebre manchada de las Monta&ntilde;as Rocosas, el tifus epid&eacute;mico y el tifus end&eacute;mico, Sin embargo, a partir del a&ntilde;o 2000 se han descrito mas de 10 especies diferentes previamente desconocidas en este continente, tanto en artr&oacute;podos como en casos cl&iacute;nicos, hecho que permite clasificarlas como entidades cl&iacute;nicas emergentes y reemergentes. </p>      <p>Dadas las manifestaciones cl&iacute;nicas de las enfermedades causadas por rickettsias, siendo la gran mayor&iacute;a inespec&iacute;ficas y, por lo mismo, compartidas con otras enfermedades infecciosas, especialmente virales y bacterianas, han sido enmarcadas entre los diagn&oacute;sticos diferenciales del s&iacute;ndrome febril agudo, tanto en &aacute;reas urbanas como tropicales. En la actualidad, se cuenta con m&eacute;todos diagn&oacute;sticos directos e indirectos, que son &uacute;tiles en la identificaci&oacute;n del agente infeccioso, en este caso, causante de rickettsiosis.</p>      <p><b>Palabras clave: </b><i>Rickettsia</i> , Am&eacute;ricas, infecciones por <i>Rickettsia</i> , epidemiolog&iacute;a, diagn&oacute;stico, zoonosis. </p>      <p>doi: <a href="http://dx.doi.org/10.7705/biomedica.v33i0.1466" target="_blank">http://dx.doi.org/10.7705/biomedica.v33i0.1466</a></p>    <hr size=1>      <p><b>Tick-borne rickettsioses in the Americas: clinical and epidemiological advances, and diagnostic challenges</b></p>      <p>Rickettsioses are a group of zoonotic diseases caused by strict intracellular bacteria of the genus <i>Rickettsia </i>and <i>Orientia</i> which belong to the Rickettsiaceae family. Their ecology is influenced by environmental factors and the presence of specific vectors that determine the establishment and epidemiology in different world regions. In America, during the 20 th century, only three of these diseases were recognized: Rocky Mountain spotted fever, epidemic typhus and endemic typhus. However, since 2000, more than 10 different species that had previously been unknown in this continent have been described, both in arthropods and in clinical cases, fact that classifies them as emerging and re-emerging diseases. Given the clinical manifestations of the diseases caused by rickettsias, being the majority unspecific and, therefore, shared with other infectious diseases, especially viral and bacterial, they have been framed within the differential diagnoses of acute febrile syndrome in urban and tropical areas. Nowadays, there are direct and indirect diagnostic methods, which are useful in the definition of the infectious agent, in this case, the cause of rickettsioses. </p>      ]]></body>
<body><![CDATA[<p><b>Key words: </b><i>Rickettsia</i> , Americas, <i>Rickettsia</i> infections, epidemiology, diagnosis, zoonoses. </p>      <p>doi: <a href="http://dx.doi.org/10.7705/biomedica.v33i0.1466" target="_blank">http://dx.doi.org/10.7705/biomedica.v33i0.1466</a> </p>    <hr size=1>      <p>Las rickettsiosis son entidades cl&iacute;nicas de tipo zoon&oacute;tico, causadas por bacterias estrictas de los g&eacute;neros <i>Rickettsia </i>y <i>Orientia</i> , pertenecientes a la familia Rickettsiaceae (1). En la actualidad, con base en an&aacute;lisis filogen&eacute;ticos, se proponen dos clasificaciones para las diferentes especies de este g&eacute;nero. En la primera se describen cuatro grupos: grupo de las fiebres manchadas ( <i>R. rickettsii</i> , <i>R. conorii</i> y <i>R. parkeri</i> , entre otras), grupo del tifus ( <i>R. prowazekii</i> y <i>R. typhi</i> ), grupo transicional ( <i>R. akari</i> , <i>R. australis</i> y <i>R. felis</i> ) y grupo ancestral ( <i>R. bellii </i>y <i>R. canadensis</i> ) (2). En la segunda, se contemplan &uacute;nicamente dos grupos con subgrupos: grupo de las fiebres manchadas (subgrupo <i>R. rickettsii ,</i> subgrupo <i>R. massiliae</i> , subgrupo <i>R. helvetica</i> y subgrupo <i>R. akari</i> ) y grupo del tifus (subgrupo <i>R. prowazekii</i> ) (3) (<a href="#cuadro1">cuadro 1</a>). </p>      <p>    <center>   <a name="cuadro1"><img src="img/revistas/bio/v33s1/v33s1a18t1.gif"></a> </center></p>      <p>    <center>   <a name="cuadro1"><img src="img/revistas/bio/v33s1/v33s1a18t1b.gif"></a> </center></p>      <p>    <center>   <a name="cuadro1"><img src="img/revistas/bio/v33s1/v33s1a18t1c.gif"></a> </center></p>       <p>En condiciones naturales, las rickettsias pat&oacute;genas suelen utilizar artr&oacute;podos y peque&ntilde;os mam&iacute;feros como reservorios y hu&eacute;spedes amplificadores, siendo el ser humano un hu&eacute;sped accidental (35). El hombre se ve afectado despu&eacute;s de la inoculaci&oacute;n bacteriana mediante la picadura de garrapatas (gran parte de las especies del grupo de las fiebres manchadas) o &aacute;caros ( <i>R</i><i>. akari</i> y <i>Orientia tsutsugamushi</i> ) y por el contacto de abrasiones cut&aacute;neas con heces de pulgas ( <i>R. typhi</i> y <i>R. felis</i> ) o piojos ( <i>R. prowazekii</i> ) (36). Por lo anterior, hacen parte de las enfermedades transmitidas por vectores de importancia m&eacute;dica (37). </p>      ]]></body>
<body><![CDATA[<p>En cuanto a la fisiopatolog&iacute;a, las c&eacute;lulas endoteliales son el blanco donde invaden y proliferan estos microorganismos, a excepci&oacute;n de <i>R. akari</i> (tropismo por los macr&oacute;fagos), causando da&ntilde;o endotelial directo asociado a liberaci&oacute;n de citocinas pro-inflamatorias y estr&eacute;s por oxidaci&oacute;n, lo que lleva a un proceso de vasculitis de peque&ntilde;os y medianos vasos, acompa&ntilde;ado de extravasaci&oacute;n de l&iacute;quidos (2,38). </p>      <p>El cuadro cl&iacute;nico se caracteriza por fiebre de inicio agudo, s&iacute;ntomas inespec&iacute;ficos, como malestar general, cefalea, mialgias, artralgias, y en algunas ocasiones, manifestaciones de tipo exantem&aacute;tico en piel. En los casos m&aacute;s graves, dado el da&ntilde;o vascular, suele producirse afectaci&oacute;n pulmonar (edema, neumon&iacute;a intersticial, s&iacute;ndrome de dificultad respi-ratoria del adulto ), cerebral (meningoencefalitis, convulsiones, d&eacute;ficit neurol&oacute;gico), falla renal aguda y choque hipovol&eacute;mico (39). Cabe resaltar que algunas de estas enfermedades presentan, entre sus manifestaciones cl&iacute;nicas dermatol&oacute;gicas, la escara de inoculaci&oacute;n (&uacute;nica o m&uacute;ltiple), que se define como una lesi&oacute;n costrosa-necr&oacute;tica con halo eritematoso circundante que determina el sitio de ingreso de las rickettsias (40). </p>      <p>En la actualidad, se reconocen, aproximadamente, 25 especies pertenecientes al g&eacute;nero <i>Rickettsia</i> (41), las cuales presentan una distribuci&oacute;n mundial. Su ecolog&iacute;a est&aacute; determinada por fac-tores ambientales y la presencia de vectores espec&iacute;ficos que condicionan el establecimiento y las caracter&iacute;sticas epidemiol&oacute;gicas de determinadas rickettsiosis en diferentes regiones del mundo (1). En las Am&eacute;ricas, durante el siglo XX, &uacute;nicamente se reconoc&iacute;an tres de estas enfermedades: la fiebre manchada de las Monta&ntilde;as Rocosas, el tifus epid&eacute;mico y el tifus end&eacute;mico. Sin embargo, a partir del a&ntilde;o 2000 se han descrito m&aacute;s de 10 especies diferentes previamente desconocidas en este continente, tanto en artr&oacute;podos como en casos cl&iacute;nicos, hecho que permite clasificarlas como entidades cl&iacute;nicas emergentes y reemergentes (5,42). No obstante, en algunos pa&iacute;ses contin&uacute;an siendo subdiagnosticadas debido a una pobre sospecha cl&iacute;nica, al hecho de ser confundidas con otras causas de s&iacute;ndrome febril agudo y, a pesar de que existen m&eacute;todos diagn&oacute;sticos estandarizados, muchos de ellos no est&aacute;n disponibles para las entidades m&eacute;dicas, presentan situaciones de reacci&oacute;n cruzada entre las diferentes especies del g&eacute;nero <i>Rickettsia </i>o requieren instalaciones de alto nivel de complejidad (5,43). </p>      <p>A continuaci&oacute;n, se presenta una visi&oacute;n actual de las rickettsiosis transmitidas por garrapatas en las Am&eacute;ricas y su papel como reto diagn&oacute;stico. </p>      <p><b>Rickettsiosis transmitidas por garrapatas </b></p>      <p>Las garrapatas hacen parte de los artr&oacute;podos vectores de mayor importancia en la transmisi&oacute;n de microorganismos al hombre y a los animales (37). Pertenecen al orden Parasitiformes, suborden Ixodida, y se subdividen en tres familias: Ixodidae, tambi&eacute;n llamadas &quot;garrapatas de cuerpo duro&quot; (mayor n&uacute;mero de especies), Argasidae (garra-patas de cuerpo blando) y Nuttalliellidae (una sola especie, que no est&aacute; presente en Am&eacute;rica y sin papel pat&oacute;geno para el humano) (44). Por su parte, diferentes g&eacute;neros de la familia Ixodidae est&aacute;n implicados en el papel vectorial y como reservorios o amplificadores de las rickettsias del grupo de las fiebres manchadas (45), los cuales requieren un periodo aproximado entre 6 y 24 horas de hematofagia continua en el ser humano, para la transmisi&oacute;n de estos microorganismos (46). En las Am&eacute;ricas, las garrapatas de los g&eacute;neros <i>Dermacentor</i> , <i>Rhipicephalus</i> y <i>Amblyomma </i>est&aacute;n fuertemente relacionadas con la transmisi&oacute;n de <i>R. rickettsii</i> , <i>R. parkeri</i> , <i>R. massiliae </i>y <i>R. africae</i> , siendo estas, las especies mas representativas en este continente (5,47). </p>      <p><b><i>Infecci&oacute;n por Rickettsia rickettsii (fiebre manchada de las Monta&ntilde;as Rocosas)</i></b></p>      <p>La fiebre manchada de las Monta&ntilde;as Rocosas es causada por <i>R. rickettsii ,</i> perteneciente al grupo de las fiebres manchadas. Es la especie m&aacute;s pat&oacute;gena del g&eacute;nero, con tasas de letalidad documentadas entre 23 y 85 % en la era preantibi&oacute;tica y del 5 % con un tratamiento antibi&oacute;tico adecuado (48,49). </p>      <p>Cl&iacute;nicamente, presenta un periodo de incubaci&oacute;n entre 2 y 14 d&iacute;as despu&eacute;s de la picadura de la garrapata (aproximadamente, el 40 % de los pacientes lo recuerda), con una media de 7 d&iacute;as (50). En las fases iniciales predominan los s&iacute;ntomas inespec&iacute;ficos, como fiebre de inicio abrupto, malestar general, escalofr&iacute;os, cefalea intensa, mialgias, artralgias, anorexia, v&oacute;mito y dolor abdominal, entre otros, los cuales suelen simular infecciones virales (51). La tr&iacute;ada cl&iacute;nica cl&aacute;sica es fiebre, cefalea y exantema, presente &uacute;nicamente en 3 a 5 % en los primeros tres d&iacute;as, porcentaje que aumenta hasta 60 a 70 % entre el d&iacute;a siete y el diez de la enfermedad (52). El exantema se inicia t&iacute;picamente en las mu&ntilde;ecas y los tobillos, como lesiones maculares eritematosas peque&ntilde;as no pruriginosas, para diseminarse de forma centr&iacute;peta, y alcanzar las extremidades (incluyendo palmas y plantas) y el tronco. En esta fase el exantema suele ser m&aacute;culo-papular asociado a petequias (53); sin embargo, el 10 % de los pacientes nunca desarrollan manifestaciones exantem&aacute;ticas; esto suele ser m&aacute;s frecuente en adultos mayores y afrodescendientes (54). En los casos graves pueden existir zonas de necrosis y gangrena en extremidades, sin ser frecuentes las hemorragias o la coagulaci&oacute;n intravascular diseminada. Las complicaciones incluyen meningitis o meningoencefalitis, edema pulmonar, s&iacute;ndrome de dificultad respiratoria del adulto, falla renal aguda, disfunci&oacute;n hep&aacute;tica, choque hipovol&eacute;mico y, rara vez, compromiso card&iacute;aco (50). </p>      <p>La primera descripci&oacute;n de la enfermedad se remonta a 1899, la cual fue inicialmente llamada &quot;fiebre manchada de Idaho&quot; por Edward Maxey (55). Posteriormente, gracias a estudios realizados en el estado de Montana (zona geogr&aacute;fica al noroeste de Estados Unidos donde se present&oacute; inicialmente la enfermedad) por el pat&oacute;logo estadounidense Howard Taylor Ricketts, en 1906, se determin&oacute; que la fiebre manchada de las Monta&ntilde;as Rocosas, era causada por microorganismos circulantes en garrapatas de la especie <i>Dermacentor andersoni</i> , en mam&iacute;feros silvestres y que, a su vez, eran transmitidas al hombre mediante la picadura de estos artr&oacute;podos (56). Desde esa &eacute;poca hasta nuestros d&iacute;as, siendo una rickettsiosis restringida al hemisferio occidental, esta enfermedad se ha descrito en varios pa&iacute;ses del continente americano desde Canad&aacute; hasta Argentina (4,5). </p>      ]]></body>
<body><![CDATA[<p>En Estados Unidos, los principales vectores de <i>R. rickettsii</i> son <i>D. variabilis</i> en la regi&oacute;n centro-este y la Costa Atl&aacute;ntica y <i>D. andersoni</i> en la regi&oacute;n oeste (50). Los casos suelen ser m&aacute;s frecuentes en primavera y verano, cuando la actividad de estos vectores suele incrementarse (46). Seg&uacute;n los datos de los <i>Centers for Disease Control and Prevention</i> (CDC) de Atlanta, la incidencia de fiebre manchada de las Monta&ntilde;as Rocosas se increment&oacute; de menos de dos casos por mill&oacute;n de habitantes en el a&ntilde;o 2000, a ocho casos por mill&oacute;n de habitantes en el 2008, con una disminuci&oacute;n en la tasa de letalidad, la cual pas&oacute; de 1,4 % entre 1997 y 2002 a 0,5 % en el a&ntilde;o 2008 (57); probablemente, esto se explica por un aumento en la sospecha cl&iacute;nica y el inicio de tratamiento adecuado y oportuno. En el a&ntilde;o 2005, en el estado de Arizona, se report&oacute; la especie <i>R. sanguineus </i>como vector de <i>R. rickettsii</i> (58), situaci&oacute;n que ha explicado el aumento de casos en esta regi&oacute;n de los Estados Unidos, especialmente en la poblaci&oacute;n de ind&iacute;genas americanos que habitan la zona suroeste (59). </p>      <p>En estudios recientes se demuestran bajas tasas o ausencia de infecci&oacute;n por parte de <i>R. rickettsii</i> en <i>D. variabilis </i>en la regi&oacute;n este, donde esta garrapata cohabita con otras especies, como <i>Amblyomma americanum</i> y <i>A. maculatum ,</i> implicadas tambi&eacute;n como reservorios de <i>R. rickettsii</i> , al igual que de otras especies de <i>Rickettsia </i>menos pat&oacute;genas, como <i>R. parkeri</i> y <i>R. amblyommii</i> (60). Por lo anterior, se han propuesto nuevas teor&iacute;as sobre la eco-epidemiolog&iacute;a de la fiebre manchada de las Monta&ntilde;as Rocosas en Estados Unidos, en las que se resalta el papel de nuevos vectores (61) y el concepto de reacci&oacute;n cruzada entre diferentes especies del grupo de las fiebres manchadas, lo cual explica la peque&ntilde;a proporci&oacute;n de casos confirmados ante un gran n&uacute;mero de sospechados (62). </p>      <p>Respecto a Suram&eacute;rica, en Brasil, la fiebre manchada de las Monta&ntilde;as Rocosas se conoce como fiebre maculosa brasilera. Es la rickettsiosis de mayor importancia en este pa&iacute;s, es de notificaci&oacute;n obligatoria y est&aacute; bajo vigilancia epidemiol&oacute;gica estricta desde el a&ntilde;o 2001 (63). Fue descrita por primera vez en la ciudad de S&atilde;o Paulo, en 1929, como tifus exantem&aacute;tico de S&atilde;o Paulo, y posteriormente, en Minas Gerais y Rio de Janeiro (64). La mayor&iacute;a de casos se concentran en estas regiones y algunos se han descrito en el estado de Bah&iacute;a y el Distrito Federal (63). Las tasas de letalidad son considerablemente m&aacute;s altas que las reportadas en Estados Unidos, con un porcentaje aproximado de 20 a 30 %, explicado por dificultades en el diagn&oacute;stico y d&eacute;ficit en el tratamiento temprano (64), con presentaciones m&aacute;s graves de la enfermedad (65) e, incluso, cepas de <i>R. rickettsii</i> m&aacute;s virulentas respecto a las de otras regiones del continente (66). </p>      <p>Seg&uacute;n datos del Ministerio de Salud de Brasil, en el per&iacute;odo de 1997-2010, se notificaron 868 casos confirmados de fiebre maculosa brasilera con 227 muertes relacionadas en todo el territorio (63), donde la mayor incidencia se present&oacute; en la regi&oacute;n sudeste entre junio y octubre, lo que coincide con el per&iacute;odo de mayor actividad de las formas inmaduras de <i>A. cajennense ,</i> vector reconocido de <i>R. rickettsii</i> (64,67). En el ecosistema de esta garrapata, los chigüiros o capibaras ( <i>Hydrochoerus</i><i> hydrochaeris</i> ) juegan el papel de hu&eacute;spedes principales para este artr&oacute;podo y amplificadores de la enfermedad, y su presencia es un factor de riesgo para el desarrollo de brotes de fiebre maculosa brasilera (68). </p>      <p>Otras especies de garrapatas, como <i>A. aureolatum</i> y <i>R. sanguineus ,</i> tambi&eacute;n se han implicado como vectores de <i>R. rickettsii </i>en el estado de S&atilde;o Paulo, especialmente en el &aacute;rea metropolitana, donde los caninos dom&eacute;sticos hacen parte del ecosistema de ambas especies (69,70). A su vez, en estudios recientes en la misma &aacute;rea, se demostraron altas tasas de seroprevalencia en estos animales (71), situaci&oacute;n que llama la atenci&oacute;n por su cercan&iacute;a al hombre como animales de compa&ntilde;&iacute;a y posibles amplificadores competitivos de la enfermedad, como se ha demostrado en otras especies de <i>Rickettsia</i> (72,73). </p>      <p>En otros pa&iacute;ses de Centroam&eacute;rica y Suram&eacute;rica, durante el siglo XX, la fiebre manchada de las Monta&ntilde;as Rocosas ya era reconocida (74-78). En la &uacute;ltima d&eacute;cada, al igual que en Estados Unidos y Brasil, esta enfermedad ha presentado un patr&oacute;n reemergente en M&eacute;xico, Costa Rica, Panam&aacute;, Colombia y Argentina (5). </p>      <p>En M&eacute;xico, el vector principal de <i>R. rickettsii </i>es <i>R. sanguineus ,</i> caracterizado desde los a&ntilde;os 40 (79,80), seguido de <i>A. cajennense</i> (45). En algunos estudios publicados en 2010 se implica a <i>A. imitator </i>como un nuevo vector potencial (81). Es as&iacute; como las regiones end&eacute;micas se restringen a los estados del norte, centro y suroeste de M&eacute;xico (82,83). En Costa Rica se describieron casos humanos desde 1977 hasta 2003, en los cuales se aisl&oacute; <i>R. rickettsii</i> y se hizo detecci&oacute;n molecular de esta especie en garrapatas <i>Haemaphysalis leporispalustris</i> (84). El &uacute;ltimo caso reportado en la literatura cient&iacute;fica (2012) se present&oacute; en la zona urbana de la ciudad de San Jos&eacute;, donde muri&oacute; una ni&ntilde;a de ocho a&ntilde;os de edad con presencia de escara de inoculaci&oacute;n como hallazgo cl&iacute;nico interesante (85), al ser un signo excepcional dentro las manifestaciones de la fiebre manchada de las Monta&ntilde;as Rocosas (86). </p>      <p>En Panam&aacute;, despu&eacute;s de un silencio epidemiol&oacute;gico de la enfermedad y de la descripci&oacute;n de <i>A. cajennense</i> como vector principal en los a&ntilde;os 50 (76,87), solo hasta 2004 y 2007 se confirmaron nuevos casos de mortalidad en pacientes pedi&aacute;tricos y una mujer embarazada (88,89). Situaciones similares ocurren en Colombia y en Argentina (90,91). </p>      <p>La &quot;fiebre de Tobia&quot; fue el nombre que le dio el doctor Luis Pati&ntilde;o a un brote febril de alta mortalidad indicativo de fiebre manchada de las Monta&ntilde;as Rocosas ocurrido en el &quot;Valle de Tobia&quot; (departamento de Cundinamarca, Colombia), en 1935 (77). Despu&eacute;s de 70 a&ntilde;os, en la misma regi&oacute;n, se aisl&oacute; <i>R. rickettsii</i> en estudios post m&oacute;rtem de un paciente con s&iacute;ndrome febril agudo (90). Posteriormente, durante tres a&ntilde;os consecutivos (2006 a 2008) se registraron nuevos casos en el noroccidente colombiano (municipios de Necocl&iacute;, Los C&oacute;rdobas y Turbo), con tasas de letalidad entre 26 y 54 % (92-94). En un estudio recientemente publicado, en el cual se describi&oacute; la ecoepidemiolog&iacute;a de la rickettsiosis en la zona del Urab&aacute; antioque&ntilde;o, por medio de inmunofluorescencia indirecta (IFI), se demostraron t&iacute;tulos significativamente altos de IgG contra <i>R. rickettsii</i> , en muestras pareadas correspondientes a dos pacientes con s&iacute;ndrome febril agudo (1:4.096 y 1:131.072, 1:8.192 y 1:131.072, fase aguda y fase de convalecencia, respectivamente para cada individuo), que sugieren a <i>R. rickettsii</i> como agente etiol&oacute;gico; sin embargo, no se logr&oacute; aislar esta especie de <i>Rickettsia</i> en ectopar&aacute;sitos ni en roedores capturados en la zona de estudio (95). </p>      <p>En Argentina, despu&eacute;s de las primeras descripcio-nes de la enfermedad en 1999 (78), solo se ha reportado un brote con cuatro casos de mortalidad por fiebre manchada de las Monta&ntilde;as Rocosas en la provincia de Jujuy, entre 2003 y 2004 (91). Todos los casos refirieron picaduras por garrapatas antes del inicio del cuadro cl&iacute;nico febril, desarrollaron exantema petequial, hipotensi&oacute;n grave, convulsiones y finalmente la muerte. Se logr&oacute; confirmar la infecci&oacute;n por <i>R. rickettsii </i>en uno de los pacientes y en garrapatas <i>A. cajennense</i> recolectadas cerca de la zona del brote. </p>      ]]></body>
<body><![CDATA[<p><b><i>Infecci&oacute;n por Rickettsia parkeri</i></b></p>      <p>La primera descripci&oacute;n de infecci&oacute;n probable por <i>R. parkeri </i>la hizo Spencer en 1926, al documentar el caso de un hombre de 35 a&ntilde;os procedente de la costa de Virginia (Estados Unidos) con un cuadro cl&iacute;nico febril de evoluci&oacute;n benigna asociado a cefalea, mialgias, exantema m&aacute;culo-papular y escaras de inoculaci&oacute;n (96). Estos hallazgos cl&iacute;nicos sugirieron la presencia de una enfermedad similar a la fiebre manchada de las Monta&ntilde;as Rocosas. Once a&ntilde;os m&aacute;s tarde, el entom&oacute;logo y rickettsi&oacute;logo Ralph Robinson Parker, logr&oacute; aislar la rickettsia que llevar&iacute;a su apellido, en garrapatas <i>A. maculatum</i> (garrapata de la costa del golfo) recolectadas en ganado en Texas (97). Parker logr&oacute; demostrar mediante sus investigaciones, el curso benigno de la enfermedad en animales de experimentaci&oacute;n despu&eacute;s de la inoculaci&oacute;n con <i>R. parkeri ,</i> en comparaci&oacute;n con una enfermedad m&aacute;s grave tras la inoculaci&oacute;n de <i>R. rickettsii</i> (97), y la producci&oacute;n de anticuerpos heter&oacute;logos en estos animales (98). Este hecho hizo clasificar de manera inicial a esta nueva especie dentro del grupo de las fiebres manchadas. </p>      <p>En 2004, se confirm&oacute; por primera vez la infecci&oacute;n humana por <i>R. parkeri</i> en un hombre de 40 a&ntilde;os procedente del mismo estado (Virginia) y con manifestaciones cl&iacute;nicas similares a las del paciente descrito en 1926. Present&oacute; reacci&oacute;n cruzada por medio de IFI para anticuerpos de tipo IgG (t&iacute;tulo hasta 1:1.024) contra <i>R. rickettsii</i> y <i>R. parkeri .</i> Sin embargo, esta &uacute;ltima especie se logr&oacute; aislar a partir de una de las escaras de inoculaci&oacute;n. El paciente no requiri&oacute; hospitalizaci&oacute;n y respondi&oacute; r&aacute;pidamente al tratamiento con doxiciclina (99). A partir de estos hallazgos, se inici&oacute; la discusi&oacute;n en cuanto a la posibilidad de que otros casos sospechosos mas no confirmados de fiebre manchada de las Monta&ntilde;as Rocosas en Estados Unidos, con resultados menos graves y asociados a escara de inoculaci&oacute;n, podr&iacute;an explicarse por infecciones subdiagnosticadas de <i>R. parkeri</i> (100,101). </p>      <p>Actualmente, en Estados Unidos, <i>A. maculatum </i>es el principal vector reconocido para <i>R. parkeri ,</i> con tasas de infecci&oacute;n entre 11 y 43 % (102-104). Su distribuci&oacute;n se restringe a los estados que se encuentran en el borde del golfo de M&eacute;xico, la regi&oacute;n sur y la central (Alabama, Arkansas, Carolina del Norte, Carolina del Sur, Florida, Georgia, Kansas, Kentucky, Mississippi, Oklahoma, Tennessee, Texas y Virginia) (21,102-107). Recientemente, se logr&oacute; aislar ADN de <i>R. parkeri </i>en muestras de sangre de caninos dom&eacute;sticos en el sur del estado de Louisiana, regi&oacute;n donde no exist&iacute;an reportes previos de este microorganismo (108). </p>      <p>T&iacute;picamente, la enfermedad causada por <i>R. parkeri</i> se caracteriza por presentar un periodo de incubaci&oacute;n de aproximadamente una semana, despu&eacute;s del cual se inicia un cuadro cl&iacute;nico febril agudo (temperatura media de 39,2 °C) asociado a astenia, mialgias, artralgias, cefalea y exantema generalizado m&aacute;culo-papular o ves&iacute;culo-papular de predomino en tronco y extremidades, incluyendo palmas y plantas. De forma importante, se presenta escara de inoculaci&oacute;n &uacute;nica o m&uacute;ltiple en m&aacute;s del 90 % de los casos, la cual se puede acompa&ntilde;ar de linfadenopat&iacute;a en la zona contigua. La evoluci&oacute;n suele ser benigna con bajas tasas de hospitalizaci&oacute;n o complicaciones (108). Hasta el a&ntilde;o 2009, se hab&iacute;an reportado en Estados Unidos aproximadamente 19 casos probables o confirmados (109,110). </p>      <p>En Uruguay, desde 1990 hasta el 2003, la enfer-medad se confundi&oacute; inicialmente con infecci&oacute;n por <i>R. conorii </i>en casos cl&iacute;nicos febriles con presencia de escara de inoculaci&oacute;n despu&eacute;s de la picadura de garrapatas <i>A. triste</i> y pruebas serol&oacute;gicas positivas para <i>R. conorii</i> (111,112). Ante estos resultados, en el 2004 se llev&oacute; a cabo un estudio en el que se confirm&oacute; la infecci&oacute;n por <i>R. parkeri </i>en diferentes espec&iacute;menes de <i>A. triste</i> recolectadas en el periodo entre 1999 y 2004, en diferentes regiones de Uruguay; esta especie de rickettsia se propuso como responsable de los casos sugestivos de rickettsiosis en este pa&iacute;s, con una importante reacci&oacute;n cruzada con <i>R. conorii</i> en pruebas serol&oacute;gicas (113). En los a&ntilde;os siguientes (2005-2007) se confirmaron tres casos de infecci&oacute;n por <i>R. parkeri</i> por medio de la prueba serol&oacute;gica de absorci&oacute;n cruzada, previa prueba de reacci&oacute;n cruzada con ant&iacute;genos de <i>R. rickettsii .</i> Todos los casos presentaron enfermedad febril, asociada a escara de inoculaci&oacute;n, adenopat&iacute;a regional y evoluci&oacute;n favorable (114). En estudios recientes en la regi&oacute;n sur de Uruguay, se demostraron tasas de infecci&oacute;n por <i>R. parkeri</i> en <i>A. triste ,</i> entre 11,8 y 37,5 % (115). </p>      <p>En Brasil, en el a&ntilde;o 2007, <i>R. parkeri </i>se aisl&oacute; por primera vez en garrapatas <i>A. triste</i> recolectadas en el estado de S&atilde;o Paulo, con una tasa de infecci&oacute;n aproximada del 10 % (116). Tres a&ntilde;os m&aacute;s tarde, en el mismo estado, se report&oacute; el primer caso sugestivo de infecci&oacute;n por <i>R. parkeri </i>en un hombre con enfermedad febril aguda, exantema macular y escara de inoculaci&oacute;n en la regi&oacute;n lumbar, en el cual se logr&oacute; aislar ADN de rickettsias estrechamente relacionado con <i>R. parkeri</i> y <i>R. africae ,</i> proponi&eacute;ndose el nuevo aislamiento como cepa &quot;Atlantic rainforest&quot; de la especie <i>R. parkeri</i> . El estudio serol&oacute;gico por medio de IFI revel&oacute; reacci&oacute;n cruzada contra diferentes especies del grupo de las fiebres manchadas (25). Cabe aclarar que la regi&oacute;n del bosque h&uacute;medo Atl&aacute;ntico en el territorio brasilero se extiende desde el estado de Rio Grande do Norte hasta el estado de Rio Grande do Sul. </p>      <p>En el a&ntilde;o 2011, en el estado de Bahia, se report&oacute; otro caso con caracter&iacute;sticas cl&iacute;nicas sugestivas de infecci&oacute;n por <i>R. parkeri</i> (fiebre, mialgias, exantema papular en cara, tronco y extremidades superiores, escara de inoculaci&oacute;n en mu&ntilde;eca y linfadenopat&iacute;a axilar ipsilateral). La IFI demostr&oacute; reacci&oacute;n cruzada entre <i>R. parkeri</i> y <i>R. rickettsii ;</i> sin embargo, el ADN amplificado de la escara de inoculaci&oacute;n se relacion&oacute; gen&eacute;ticamente con la cepa <i>Atlantic rainforest</i> , <i>R. africae</i> , <i>R. parkeri</i> y <i>R. sibirica</i> ; por lo cual se le asign&oacute; el nombre de <i>R. parkeri</i> cepa Bahia (117). De otro lado, teniendo en cuenta estudios previos en que se demostraban caracter&iacute;sticas cl&iacute;nicas diferentes respecto a la fiebre maculosa brasilera (presencia de linfadenopat&iacute;a, menos tasas de gravedad y ausencia de letalidad), se llev&oacute; a cabo un estudio en el estado de Santa Catarina (118) en el cual se demostr&oacute; la presencia de <i>R. parkeri</i> cepa <i>Atlantic rainforest</i> en garrapatas <i>A. aureolatum</i> , <i>A. ovale</i> y <i>R. sanguineus</i> (119), las dos primeras encontradas frecuentemente parasitando seres humanos en Brasil (47). Lo anterior ha planteado la posibilidad de que garrapatas como <i>A. aureolatum</i> o <i>A. ovale</i> sean los vectores de <i>R. parkeri </i>cepa <i>Atlantic rainforest </i>en la regi&oacute;n del bosque h&uacute;medo atl&aacute;ntico en los estados de Santa Catarina y S&atilde;o Paulo (120-122), lo cual explica en el primero parte del comportamiento cl&iacute;nico de las rickettsiosis confundidas con fiebre maculosa brasilera. </p>      <p>En estudios recientes en garrapatas recolectadas de aves de la regi&oacute;n sur de Brasil, se demostr&oacute; el aislamiento de nuevas cepas de <i>R. parkeri</i> (cepa NOD y cepa apPR), con capacidad pat&oacute;gena a&uacute;n desconocida (26,71,123). </p>      <p>En Argentina, el primer caso publicado como infecci&oacute;n probable por <i>R. parkeri</i> se present&oacute; en el a&ntilde;o 2007 (124), en un hombre procedente de la localidad de Ingeniero Otamendi en la regi&oacute;n del delta paranaense, quien present&oacute; un cuadro cl&iacute;nico febril agudo asociado a escalofr&iacute;os, sudoraci&oacute;n nocturna, mialgias, cefalea, astenia, tos no productiva, exantema m&aacute;culo-papular que respetaba palmas y plantas, y escara de inoculaci&oacute;n en la regi&oacute;n preauricular izquierda (con adenopat&iacute;a regional) donde previamente hab&iacute;a sido picado por una garrapata no identificada. Su evoluci&oacute;n cl&iacute;nica fue favorable despu&eacute;s del tratamiento ambulatorio con doxiciclina. La prueba de IFI fue positiva contra ant&iacute;genos de <i>R. rickettsii ,</i> lo cual se interpret&oacute; como una reacci&oacute;n cruzada dadas las manifestaciones cl&iacute;nicas de la enfermedad y el &aacute;rea de procedencia, donde <i>A. triste</i> se ha encontrado parasitando humanos y por su papel vectorial en Uruguay (114,125). A&ntilde;os m&aacute;s tarde (2008 y 2011), se confirm&oacute; la presencia de <i>R. parkeri</i> tanto en garrapatas <i>A. triste</i> recolectadas en el delta del Paran&aacute; (126) como en material gen&eacute;tico extra&iacute;do de escaras de inoculaci&oacute;n de pacientes procedentes de esta misma regi&oacute;n y &aacute;reas rurales de la provincia de Buenos Aires y provincia del Chaco (127). En este &uacute;ltimo estudio se determin&oacute; que las manifestaciones cl&iacute;nicas presentadas por los pacientes en Argentina eran muy similares a las de los casos confirmados en Estados Unidos. </p>      ]]></body>
<body><![CDATA[<p>Recientemente, en el departamento de Cochabamba (Bolivia), se logr&oacute; detectar <i>R. parkeri</i> en garrapatas <i>A. tigrinum</i> (tasa de infecci&oacute;n de 54,8 %) recolec-tadas de caninos dom&eacute;sticos, al igual que en una muestra de sangre tomada de estos animales (128). Sin embargo, a la fecha no existen reportes de casos cl&iacute;nicos indicativos de infecci&oacute;n por <i>R. parkeri</i> en Bolivia. </p>      <p><b><i>Infecci&oacute;n por Rickettsia massiliae</i></b></p>      <p><i>Rickettsia massiliae</i> se aisl&oacute; por primera vez cerca a Marsella (Francia) en 1992, en garrapatas <i>R. sanguineus</i> (129,130). Despu&eacute;s de esto, se describi&oacute; en pa&iacute;ses europeos y africanos, como Grecia (131), Portugal (132,133), Espa&ntilde;a (134,135), Suiza (136), Rep&uacute;blica Centroafricana y Mal&iacute; (137), infectando diferentes especies del g&eacute;nero <i>Rhipicephalus</i> , como <i>R. sanguineus</i> , <i>R. turanicus</i> , <i>R. muhsamae</i> , <i>R. lunulatus</i> y <i>R. sulcatus</i> . </p>      <p>En 1985, se report&oacute; un caso de rickettsiosis inicialmente confundido con fiebre manchada del Mediterr&aacute;neo, en un paciente de 45 a&ntilde;os hospitalizado en Palermo (Italia) por presentar enfermedad febril aguda asociada a exantema m&aacute;culo-papular que compromet&iacute;a palmas y plantas, escara de inoculaci&oacute;n en el tobillo derecho y ligera hepatomegalia. Fue tratado con tetraciclinas, tuvo una adecuada evoluci&oacute;n cl&iacute;nica y present&oacute; seroconversi&oacute;n por medio de IFI para <i>R. conorii .</i> Veinte a&ntilde;os m&aacute;s tarde, se logr&oacute; extraer y amplificar ADN de las muestras de este paciente, encontr&aacute;ndose material gen&eacute;tico indicativo de <i>R. massiliae</i> (138). Un segundo caso se confirm&oacute; en el sur de Francia, en un paciente que desarroll&oacute; fiebre, cefalea, exantema m&aacute;culo-papular, escara de inoculaci&oacute;n en la axila izquierda y coriorretinitis bilateral (139). </p>      <p>En las Am&eacute;ricas, esta especie se aisl&oacute; inicialmente en garrapatas <i>R. sanguineus</i> del estado de Arizona (Estados Unidos) y, en la ciudad de Buenos Aires (Argentina) en el a&ntilde;o 2004, sin presencia de casos cl&iacute;nicos relacionados (7,9). Sin embargo, un a&ntilde;o m&aacute;s tarde se present&oacute; el primero y &uacute;nico caso de infecci&oacute;n humana por <i>R. massiliae</i> reportado hasta la fecha en el hemisferio occidental (8). Se trataba de una mujer de 56 a&ntilde;os procedente de Argentina con un cuadro cl&iacute;nico febril agudo, escalofr&iacute;os, malestar general, y exantema purp&uacute;rico que compromet&iacute;a tronco, extremidades, palmas y plantas. La paciente report&oacute; presencia de garrapatas en su perro antes de su enfermedad, por lo cual se inici&oacute; tratamiento con doxiciclina ante la sospecha de rickettsiosis. En el examen f&iacute;sico se observ&oacute; una escara de inoculaci&oacute;n en el muslo derecho, de la cual se tom&oacute; biopsia y se logr&oacute; amplificar ADN indicativo de <i>R. massiliae .</i> </p>      <p>Recientemente, se report&oacute; por primera vez la presencia de <i>R. massiliae</i> en garrapatas <i>R. sanguineus</i> en el estado de California (Estados Unidos), recolectadas en dos perros con enfer-medad sugestiva de fiebre manchada de las Monta&ntilde;as Rocosas. A pesar de que estos animales presentaron seroconversi&oacute;n por IFI para <i>R. rickettsii ,</i> se logr&oacute; determinar en uno de ellos infecci&oacute;n por <i>R. massiliae</i> mediante la prueba de absorci&oacute;n cruzada y <i>Western Blot</i> (140). </p>      <p><b><i>Infecci&oacute;n por Rickettsia africae (fiebre africana transmitida por garrapatas)</i></b></p>      <p>La primera descripci&oacute;n de esta enfermedad se hizo en Mozambique y Sur&aacute;frica, en 1911, donde se le dio el nombre de &quot;fiebre transmitida por garrapatas&quot; (141). Fue confundida con la fiebre manchada del Mediterr&aacute;neo hasta mediados de 1930, cuando el pat&oacute;logo Pijper, mientras trabajaba en la ciudad de Pretoria (Sur&aacute;frica), propuso que esta era una nueva rickettsiosis transmitida por garrapatas, de predominio rural, de caracter&iacute;sticas cl&iacute;nicas menos graves y relacionada con el contacto de las personas con garrapatas del ganado (142). A pesar de que el pat&oacute;logo logr&oacute; aislar el microorganismo y diferenciarlo de <i>R. conorii ,</i> sus resultados no fueron reproducibles. Fue as&iacute; como nuevamente los casos se siguieron diagnosticando de forma err&oacute;nea como infecci&oacute;n por <i>R. conorii</i> hasta los a&ntilde;os 90 (45). En el periodo comprendido entre 1991 y 1996, Kelly, <i>et al</i> ., lograron aislar el nuevo microorganismo en garrapatas <i>A. hebraeum</i> , <i>A. variegatum</i> y en muestras de pacientes de Zimbabue, y propusieron el nombre que a&uacute;n se conserva para esta especie, <i>R. africae, </i>perteneciente al grupo de las fiebres manchadas (143-146).</p>      <p>La distribuci&oacute;n actual de <i>R. africae</i> est&aacute; determinada por la presencia de garrapatas vectores como <i>A. variegatum ,</i> en las regiones este, oeste y central de &Aacute;frica, al igual que en las islas del Caribe, y <i>A. hebraeum</i> , en la regi&oacute;n sur de &Aacute;frica (45). <i>Rickettsia africae</i> tambi&eacute;n se ha aislado en <i>A. lepidum </i>y <i>A. variegatum</i> en Sud&aacute;n (noreste africano) (147), en <i>Hyalomma dromedarii </i>en Argelia (noroeste africano) (41) y Egipto (noreste africano) (148), en <i>A. loculosum</i> en Nueva Caledonia (Ocean&iacute;a) (149), en <i>Rhipicephalus</i> ( <i>Boophilus</i> ) <i>decoloratus</i> en la Rep&uacute;blica de Botsuana (Sur&aacute;frica) (150) y en <i>H. aegyptium </i>en Estambul (Turqu&iacute;a) (151). </p>      <p>La enfermedad se caracteriza cl&iacute;nicamente por un periodo de incubaci&oacute;n entre 5 y 10 d&iacute;as. Suele presentarse fiebre de inicio abrupto, n&aacute;useas, cefalea, mialgias en regi&oacute;n cervical y escara de inoculaci&oacute;n &uacute;nica o m&uacute;ltiple (en m&aacute;s del 50 % de los casos), de predominio en las extremidades inferiores, asociada a linfadenopat&iacute;a regional. El exantema se presenta en la mitad de los casos y es vesicular o maculopapular (45). </p>      ]]></body>
<body><![CDATA[<p><i>Rickettsia africae </i>ingres&oacute; a las Am&eacute;ricas durante el siglo XIX, en barcos procedentes de Senegal rumbo a la isla de Guadalupe (islas del Caribe), los cuales tra&iacute;an ganado parasitado con <i>A. variegatum</i> (152). El primer caso se describi&oacute; en 1998, en una mujer francesa que adquiri&oacute; la enfermedad despu&eacute;s de la picadura por una garrapata en la isla de Guadalupe, y present&oacute; fiebre, astenia y lesi&oacute;n nodular eritematosa. Fue tratada con doxiciclina, evolucion&oacute; adecuadamente y se determin&oacute; <i>R. africae</i> como agente etiol&oacute;gico por medio de la prueba de inmunoabsorci&oacute;n cruzada (14). Un a&ntilde;o m&aacute;s tarde, en la misma isla, se confirm&oacute; la infecci&oacute;n por esta especie en garrapatas <i>A. variegatum</i> y se demostraron altas seroprevalencias en humanos (49 %), bovinos (80,8 %) y caprinos (86,6 %) (15). </p>      <p>A partir del a&ntilde;o 2002, se han realizados varios estudios que demuestran que las islas del Caribe son un &aacute;rea end&eacute;mica para <i>R. africae ,</i> con las siguientes tasas de infecci&oacute;n en <i>A. variegatum</i> : 84 % en la isla de Antigua (2002) (152), 41 % en las islas de San Crist&oacute;bal y Nieves (2003) (153), y 56 % en la isla de La Martinica (2003) (17). El &uacute;ltimo estudio, de 2007 a 2009 (16), tambi&eacute;n revel&oacute; datos similares en otras islas: 50 % en las Islas V&iacute;rgenes, 30 % en la Isla Dominica, 40 % en la isla de Monserrat y 7 % en la isla de Santa Luc&iacute;a. En este estudio tambi&eacute;n se demostraron altas tasas de seroprevalencia para rickettsias del grupo de las fiebres manchadas en bovinos, caprinos y ovinos. </p>      <p>Llama la atenci&oacute;n que la mayor&iacute;a de los casos cl&iacute;nicos reportados en pacientes que adquirieron la infecci&oacute;n en estas islas, eran turistas y no habitantes de esta regi&oacute;n (14,154). </p>      <p>Hasta la fecha, <i>R. africae</i> no ha sido reportada en otras regiones de las Am&eacute;ricas diferentes a las islas del Caribe. </p>      <p><b><i>Infecci&oacute;n por Rickettsia amblyommii</i></b></p>      <p>Esta especie fue descrita por primera vez en garrapatas <i>A. americanum</i> del estado de Tennessee, en 1974, como parte del grupo de las fiebres manchadas y sin capacidad pat&oacute;gena conocida (155). En estudios posteriores se demostr&oacute; que m&aacute;s del 40 % de estas garrapatas se encontraban infectadas con <i>R. amblyommii</i> en las regiones sur y centro-oeste de Estados Unidos (18,156). </p>      <p>Solo en 1993 se plante&oacute; la posibilidad de que esta especie hubiese sido la causa de un brote febril en personal militar que se encontraba en los estados de Arkansas y Virginia. Por medio de <i>Western Blot</i> se logr&oacute; determinar que algunos de estos pacientes presentaron reacci&oacute;n con prote&iacute;nas antig&eacute;nicas de <i>R. amblyommii</i> (157). Doce a&ntilde;os m&aacute;s tarde, en otro estudio en el estado de Carolina del Norte, se determin&oacute; la seroconversi&oacute;n para <i>R. amblyommii</i> en pacientes con diagn&oacute;stico presuntivo de fiebre manchada de las Monta&ntilde;as Rocosas con prueba de IFI negativa para <i>R. rickettsii .</i> A su vez, en el mismo estudio, se encontraron garrapatas <i>A. americanum</i> infectadas con <i>R. amblyommii</i> (158). </p>      <p>Dados estos antecedentes, en la actualidad se plantea la posibilidad de que esta especie de rickettsia pueda causar cuadros cl&iacute;nicos febriles de evoluci&oacute;n benigna, falsamente diagnosticados como fiebre manchada de las Monta&ntilde;as Rocosas u otras rickettsiosis, teniendo en cuenta la situaci&oacute;n de reacci&oacute;n cruzada que se presenta por ser de un mismo grupo, en este caso, el grupo de las fiebres manchadas (5). Por su parte, esta misma situaci&oacute;n tambi&eacute;n podr&iacute;a explicar las altas tasas de seroprevalencia para <i>R. rickettsii</i> en regiones donde no se presenta el n&uacute;mero de casos esperados (43). </p>      <p>Cabe destacar que a la fecha, aparte de Estados Unidos, <i>R. amblyommii</i> se ha aislado en <i>A. neumanni</i> en Argentina (159), <i>A. cajennense ,</i> <i>A. coelebs</i> , <i>A. longirostre</i> y <i>A. geayi</i> en Brasil (160-163), <i>A. cajennense</i> en Costa Rica (164), <i>A. coelebs</i> en la Guyana Francesa (165) y <i>A. cajennense</i> , <i>R. sanguineus</i> y <i>Dermacentor nitens</i> en Panam&aacute; (166,167). </p>      <p><b>Retos en el diagn&oacute;stico </b></p>      ]]></body>
<body><![CDATA[<p>Debido a que la gran mayor&iacute;a de las manifestaciones cl&iacute;nicas de las rickettsiosis son inespec&iacute;ficas (fiebre, cefalea, malestar general, mialgias y artralgias, entre otras) y, por lo mismo, compartidas con otras enfermedades infecciosas, especialmente virales y bacterianas, se han enmarcado dentro de los diagn&oacute;sticos diferenciales del s&iacute;ndrome febril agudo, tanto en &aacute;reas urbanas como tropicales (45). De igual manera, entre las mismas rickettsiosis se presentan signos similares, como el exantema o la escara de inoculaci&oacute;n que, a pesar de sugerir infecci&oacute;n por esta familia de microorganismos (Rickettsiaceae), no logran determinar de manera concreta un agente etiol&oacute;gico preciso. Tambi&eacute;n, los hallazgos hematol&oacute;gicos y bioqu&iacute;micos comunes a las rickettsiosis (trombocitopenia, anormalidad en el n&uacute;mero de leucocitos, elevaci&oacute;n moderada de enzimas hep&aacute;ticas, etc.) son solo una prueba indirecta de la fisiopatolog&iacute;a de la enfermedad que, en algunos casos, puede tener un comportamiento variable seg&uacute;n el tiempo de evoluci&oacute;n y su gravedad en el paciente. Cabe resaltar que, al ser enfermedades transmitidas por artr&oacute;podos vectores, y en algunos casos de distribuci&oacute;n geogr&aacute;fica definida, una adecuada anamnesis sobre los ante-cedentes epidemiol&oacute;gicos puede orientar al m&eacute;dico a un diagn&oacute;stico presuntivo (45). </p>      <p>Dentro de este contexto, en la actualidad se cuenta con m&eacute;todos diagn&oacute;sticos directos e indirectos &uacute;tiles para identificar el agente infeccioso, tanto en la fase aguda de la enfermedad (pruebas moleculares, inmunohistoqu&iacute;mica y cultivo celular) como de forma retrospectiva (m&eacute;todos serol&oacute;gicos), estos &uacute;ltimos s&oacute;lo confirmatorios o &uacute;tiles para estudios epidemiol&oacute;gicos (<a href="#cuadro2">cuadro 2</a>). </p>      <p>    <center>   <a name="cuadro2"><img src="img/revistas/bio/v33s1/v33s1a18t2.gif"></a> </center></p>      <p>La prueba serol&oacute;gica por medio de IFI es el m&eacute;todo de referencia (<a href="#cuadro2">cuadro 2</a>). Sin embargo, aunque este m&eacute;todo es de f&aacute;cil acceso y manejo, es de utilidad diagn&oacute;stica retrospectiva y, debido a las caracter&iacute;sticas antig&eacute;nicas compartidas, presenta reacciones cruzadas entre las diferentes especies del g&eacute;nero <i>Rickettsia</i> , sobre todo cuando pertenecen a un mismo grupo (grupo de las fiebres manchadas, grupo del tifus, etc.) (168). Esta es la prueba m&aacute;s utilizada en las Am&eacute;ricas para estudios de seroprevalencia y como m&eacute;todo diagn&oacute;stico frente a infecciones por rickettsias. </p>      <p>Otro m&eacute;todo en el cual se utilizan muestras de suero, es el <i>Western Blot</i> asociado a inmunoabsorci&oacute;n cruzada. Tiene la gran ventaja de identificar la especie de <i>Rickettsia </i>involucrada en determinada infecci&oacute;n, descartando reacciones cruzadas con otras especies. Esta prueba se basa en la absorci&oacute;n de anticuerpos hom&oacute;logos y heter&oacute;logos presentes en el suero del paciente que, posteriormente, son verificados por medio del <i>Western Blot</i> al unirse o no hacerlo a prote&iacute;nas antig&eacute;nicas de las diferentes especies de <i>Rickettsia</i> . Si se presenta la absorci&oacute;n de ambos anticuerpos, la especie de <i>Rickettsia </i>utilizada en la mezcla con el suero, se identifica como el agente etiol&oacute;gico; mientras que, si &uacute;nicamente se remueven los anticuerpos heter&oacute;logos, la especie en la mezcla se identifica como el agente causal de la reacci&oacute;n cruzada. </p>      <p>Cabe aclarar que este es un m&eacute;todo costoso y que requiere de tiempo considerable de dedicaci&oacute;n, ya que se deben mantener viables numerosas espe cies de este g&eacute;nero para llevar a cabo las pruebas (168). Este m&eacute;todo se utiliza en laboratorios de referencia de Europa, para establecer un diagn&oacute;stico retrospectivo del agente etiol&oacute;gico involucrado en cuadros cl&iacute;nicos sugestivos de rickettsiosis. Por el contrario, en las Am&eacute;ricas, el <i>Western Blot</i> asociado a inmunoabsorci&oacute;n cruzada no se utiliza de rutina y son pocos los casos publicados en el hemisferio occidental donde determinan la especie de <i>Rickettsia</i> involucrada en infecciones humanas utilizando este m&eacute;todo (14). </p>      <p>Los otros m&eacute;todos, como la inmunohistoqu&iacute;mica, el cultivo celular y la amplificaci&oacute;n por medio de qPCR y PCR convencional de genes conservados del g&eacute;nero <i>Rickettsia</i> , se vienen utilizando con mayor frecuencia en el mundo, de forma &uacute;nica y en combinaci&oacute;n, siendo posible la determinaci&oacute;n de las especies pat&oacute;genas de <i>Rickettsia</i> , de una forma r&aacute;pida, eficaz y directa,. Estos m&eacute;todos son los &uacute;nicos que pueden proveer un diagn&oacute;stico acertado durante la fase aguda de la enfermedad. Sin embargo, las muestras de mayor accesibilidad en los pacientes, como las de sangre, no suelen contener el suficiente n&uacute;mero de microorganismos para su adecuada amplificaci&oacute;n y caracterizaci&oacute;n. La mayor utilidad de estos m&eacute;todos est&aacute; en casos con lesiones dermatol&oacute;gicas que se prestan para practicar biopsia y que contienen considerable n&uacute;mero de microorganismos viables, como la escara de inoculaci&oacute;n (168).</p>      <p><b>Conclusiones </b></p>      <p>Es claro que a lo largo del tiempo, hasta nuestros d&iacute;as, las rickettsiosis transmitidas por garrapatas en las Am&eacute;ricas han adquirido un papel impor- tante entre las enfermedades emergentes y reemergentes causantes de cuadros febriles agudos, brotes o, inclusive, epidemias. Cada vez son m&aacute;s las publicaciones de nuevos aislamientos de especies de la familia Rickettsiaceae en, artr&oacute;podos vectores, animales y seres humanos, lo que se relaciona con nuevas descripciones de s&iacute;ndromes cl&iacute;nicos y permite aportes a la ecoepidemiolog&iacute;a de estas enfermedades. </p>      ]]></body>
<body><![CDATA[<p>Hasta finales del siglo XX, las rickettsiosis de mayor impacto y reconocimiento en el hemisferio occidental eran la fiebre manchada de las Monta&ntilde;as Rocosas, el tifus murino y el tifus epid&eacute;mico. En el presente siglo, dados los m&uacute;ltiples estudios de investigaci&oacute;n y las nuevas herramientas de diagn&oacute;stico y caracterizaci&oacute;n de microorganismos, se ha demostrado el papel de especies como <i>R. parkeri ,</i> probablemente sub-diagnosticada, como responsables de nuevas enfermedades, que se superponen en antiguas zonas end&eacute;micas para fiebre manchada de las Monta&ntilde;as Rocosas. Adem&aacute;s, las rickettsiosis asociadas a escara de inoculaci&oacute;n (considerada hasta hace algunos a&ntilde;os como un signo cl&iacute;nico infrecuente en las Am&eacute;ricas), se han caracterizado recientemente, abriendo las posibilidades diagn&oacute;sticas, de forma similar a lo que sucede con la epidemiolog&iacute;a de las rickettsiosis transmitidas por garrapatas en Europa, &Aacute;frica y Asia. </p>      <p>El continente americano tambi&eacute;n ha sido responsable del aislamiento y los estudios de seroprevalencia sobre nuevas especies de importancia, como <i>R. amblyommii ,</i> cuyo papel como pat&oacute;geno, a pesar de discutirse, puede causar altas tasas de seroprevalencia para rickettsias del grupo de las fiebres manchadas o, incluso, causar infecciones subcl&iacute;nicas o asintom&aacute;ticas. </p>      <p>Con lo anterior, son evidentes la complejidad y el reto diagn&oacute;stico que presentan las rickettsiosis transmitidas por garrapatas en las Am&eacute;ricas, lo que amerita la b&uacute;squeda de una mejor caracterizaci&oacute;n de las especies circulantes. Probablemente, los m&eacute;todos diagn&oacute;sticos, como la IFI, fueron de mayor utilidad en a&ntilde;os pasados, cuando demostraron la circulaci&oacute;n del g&eacute;nero <i>Rickettsia</i> en diferentes regiones y permitieron diagnosticar casos probables, dada la reacci&oacute;n cruzada propia de este m&eacute;todo, sin que se pudiera establecer claramente el agente etiol&oacute;gico en cuesti&oacute;n. Sin embargo, la identificaci&oacute;n espec&iacute;fica de las diferentes especies de <i>Rickettsia </i>descritas en las Am&eacute;ricas, se ha logrado mediante t&eacute;cnicas de biolog&iacute;a molecular, defini&eacute;ndose zonas end&eacute;micas para dichas rickettsiosis. </p>      <p>Finalmente, consideramos la incursi&oacute;n e investi-gaci&oacute;n en nuevos m&eacute;todos diagn&oacute;sticos sensibles y espec&iacute;ficos de aplicaci&oacute;n en la fase aguda de la enfermedad, cuando el diagn&oacute;stico apropiado permitir&iacute;a un tratamiento antibi&oacute;tico oportuno. Esto es particularmente importante dado el diagn&oacute;stico diferencial con otras enfermedades causantes de s&iacute;ndrome febril agudo. </p>      <p>    <center><b>Conflicto de intereses </b></center></p>      <p>Los autores declaran que no tienen conflictos de intereses. </p>      <p>    <center><b><b>Financiaci&oacute;n</b></center></p>      <p>Los autores declaran no haber recibido ning&uacute;n tipo de financiaci&oacute;n para la realizaci&oacute;n del presente manuscrito. </p>      ]]></body>
<body><![CDATA[<p>Correspondencia: Marylin Hidalgo, Carrera 7 N° 43-82, Departamento de Microbiolog&iacute;a, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogot&aacute;, D.C., Colombia Tel&eacute;fono: (031) 320 8320, extensi&oacute;n 4153 <a href="mailto:hidalgo.m@javeriana.edu.co">hidalgo.m@javeriana.edu.co</a></p>      <p>    <center><b>Referencias</b></center></p>      <!-- ref --><p>1. <b>Renvois&eacute; A, Raoult D. </b>An update on rickettsiosis. Med Mal Infect. 2009;39:71-81. <a href="http://dx.doi.org/%2010.1016/j.medmal.2008.11.003" target="_blank">http://dx.doi.org/10.1016/j.medmal.2008.11.003</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000106&pid=S0120-4157201300050001800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. <b>Mansueto P, Vitale G, Cascio A, Seidita A, Pepe I, Carroccio A, <i>et al</i>. </b>New insight into immunity and immunopathology of rickettsial diseases. Clin Dev Immunol. 2012;2-26. <a href="http://dx.doi.org/10.1155/2012/967852" target="_blank">http://dx.doi.org/10.1155/2012/967852</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000107&pid=S0120-4157201300050001800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>3. <b>Merhej V, Raoult D. </b>Rickettsial evolution in the light of comparative genomics. Biol Rev Camb Philos Soc. 2011;86:379-405. <a href="http://dx.doi.org/10.1111/j.1469-185X.2010.00151.x" target="_blank">http://dx.doi.org/10.1111/j.1469-185X.2010.00151.x</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000108&pid=S0120-4157201300050001800003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>4. <b>Renvois&eacute; A, Mediannikov O, Raoult D. </b>Old and new tick-borne rickettsioses. Int Health. 2009;1:17-25. <a href="http://dx.doi.org/10.1016/j.inhe.2009.03.003" target="_blank">http://dx.doi.org/10.1016/j.inhe.2009.03.003</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000109&pid=S0120-4157201300050001800004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>5. <b>Parola P, Labruna M, Raoult D. </b>Tick-borne rickettsioses in America: Unanswered questions and emerging diseases. Curr Infect Dis Rep. 2009;11:40-50. <a href="http://dx.doi.org/10.1007/s11908-009-0007-5" target="_blank">http://dx.doi.org/10.1007/s11908-009-0007-5</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000110&pid=S0120-4157201300050001800005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>6. <b>Labruna M, M&aacute;ttar S, Nava S, Berm&uacute;dez S, Venzal J, Dolz G, <i>et al</i>. </b>Rickettsiosis in Latin America, Caribbean, Spain and Portugal. Rev MVZ C&oacute;rdoba. 2011;16:2435-57.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000111&pid=S0120-4157201300050001800006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
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