<?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>0120-5552</journal-id>
<journal-title><![CDATA[Revista Salud Uninorte]]></journal-title>
<abbrev-journal-title><![CDATA[Salud, Barranquilla]]></abbrev-journal-title>
<issn>0120-5552</issn>
<publisher>
<publisher-name><![CDATA[Fundación Universidad del Norte, División de Ciencias de la]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-55522016000100011</article-id>
<article-id pub-id-type="doi">10.14482/sun.32.1.8479</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Leptospira spp. y leptospirosis humana]]></article-title>
<article-title xml:lang="en"><![CDATA[Leptospira spp. and human leptospirosis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Vivas]]></surname>
<given-names><![CDATA[Claudia M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Falconar]]></surname>
<given-names><![CDATA[Andrew K]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Norte  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad del Norte  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2016</year>
</pub-date>
<volume>32</volume>
<numero>1</numero>
<fpage>123</fpage>
<lpage>143</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-55522016000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-55522016000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-55522016000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La leptospirosis, la enfermedad bacteriana zoonótica y emergente más importante en el mundo, es causada por las especies patógenas de Leptospira spp. Han sido descritas veinte especies de Leptospira spp.; se ha determinado la secuencia del ADN genómico de algunas cepas patógenas; la función de la mayoría de los genes involucrados en su patogénesis permanece desconocida. La leptospirosis humana presenta un rango de síntomas que van desde una fiebre indiferenciada hasta una ictericia, hemorragia, fallas renales y pulmonares severas. La administración temprana e intravenosa de penicilina G es requerida para reducir las tasas de mortalidad, pero los antibióticos pueden no ser efectivos en la enfermedad pulmonar severa. En las Américas, las áreas de alto riesgo son Brasil, Centroamérica y el Caribe. En Colombia se han realizado pocos estudios. La prueba serológica de oro, la microaglutinación, tiene alta sesibilidad y especificidad cuando se usan baterías de serovariedades locales, pero es serogrupo específica. Las vacunas generan respuestas específicas para la serovariedad usada, pero no previenen la infección o trasmisión. Problemas en el diagnóstico de laboratorio de la leptospirosis conllevan a un subregistro en el número de casos; altas tasas de mortalidad asociadas a fallas renal y pulmonar son resultado de las dificultades en el manejo de los casos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Leptospirosis, the world's most important emerging bacterial zoonotic disease, is caused by pathogenic Leptospira species. To review the latest information on Leptospira spp. and leptospirosis. We reviewed PubMed indexed papers on leptospiral microbiology, epidemiology, clinicalhuman disease, diagnostics, treatment, and disease prevention (vaccines). Twenty Leptospira species have been described and, although the genomic DNA sequences ofsome pathogenic Leptospira spp. strains have been determined, the functions of most genesinvolved in their pathogenicity remain unknown. Leptospirosis is displayed by a range ofsymptoms from undifferentiated fever to severe jaundice, hemorrhage, renal and pulmonary failures. Pulmonary disease has the highest mortalities. An early intravenous penicillin G therapies is urgently required to reduce the mortality rates, but antibiotic therapy may not be effective in severe pulmonary disease. In the Americas, the highest risk areas are Brazil, Central America and the Caribbean islands. Few studies have however been performed in Colombia. The "gold standard" serological assay, the microscopic agglutination test (MAT), has a high sensitive and specificity when used with appropriate panels of Leptospira spp. serovars and it is serogroup specific. Vaccines, are administered to animals to generate serovar-specific protective responses, but may not prevent infection or transmission. Problems in the laboratory based diagnostics of leptospirosis result in under-reporting of the number of disease cases; the high mortality rates associated with severe renal and pulmonary failures result from difficulties in case management.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Leptospira]]></kwd>
<kwd lng="es"><![CDATA[clasificación]]></kwd>
<kwd lng="es"><![CDATA[leptospirosis]]></kwd>
<kwd lng="es"><![CDATA[epidemiología]]></kwd>
<kwd lng="es"><![CDATA[presentación clínica]]></kwd>
<kwd lng="es"><![CDATA[diagnóstico]]></kwd>
<kwd lng="es"><![CDATA[tratamiento]]></kwd>
<kwd lng="en"><![CDATA[Leptospira]]></kwd>
<kwd lng="en"><![CDATA[classification]]></kwd>
<kwd lng="en"><![CDATA[leptospirosis]]></kwd>
<kwd lng="en"><![CDATA[clinical presentation]]></kwd>
<kwd lng="en"><![CDATA[diagnostics]]></kwd>
<kwd lng="en"><![CDATA[epidemiology]]></kwd>
<kwd lng="en"><![CDATA[treatment]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">      <p align="right"><a href="http://dx.doi.org/10.14482/sun.32.1.8479" target="_blank">http://dx.doi.org/10.14482/sun.32.1.8479</a></p>  <font size="4">    <p align="center"><b><i>Leptospira </i>spp. y leptospirosis humana<sup><a name="nu*"></a><a href="#num*">*</a></sup></b></p></font> <font size="4">    <p align="center"><b><i>Leptospira </i>spp. and human leptospirosis</b></p></font>     <p><b>Claudia M. Romero-Vivas<sup><a name="nu1"></a><a href="#num1">1</a></sup></b></p>     <p><b>Andrew K. Falconar<sup><a name="nu2"></a><a href="#num2">2</a></sup></b></p>     <p><sup><a name="num1"></a><a href="#nu1">1</a></sup>-<sup><a name="num2"></a><a href="#nu2">2</a></sup> Grupo de Investigaciones en Enfermedades Tropicales, Departamento de Medicina, Universidad del Norte. Barranquilla (Colombia).</p>     <p><b>Correspondencia: </b>Claudia Romero-Vivas: Fundaci&oacute;n Universidad del Norte, km 5, antigua v&iacute;a a Puerto Colombia. Tel: (5) 3509478. Fax (5) 3509233. <a href="mailto:clromero@uninorte.edu.co">clromero@uninorte.edu.co</a></p>     <p><b>Fecha de recepci&oacute;n:</b> 11 de agosto de 2015     <br><b>Fecha de aceptaci&oacute;n:</b> 6 de noviembre de 2015</p> <hr>     ]]></body>
<body><![CDATA[<p><b>Resumen</b></p>     <p><i>La </i>leptospirosis, <i>la enfermedad bacteriana zoon&oacute;tica y emergente m&aacute;s importante en el mundo, es causada por las especies pat&oacute;genas de </i>Leptospira <i>spp. Han sido descritas veinte especies de </i>Leptospira <i>spp.; se ha determinado la secuencia del </i><i>ADN </i><i>gen&oacute;mico de algunas cepas pat&oacute;genas; la funci&oacute;n de la mayor&iacute;a de los genes involucrados en su patog&eacute;nesis permanece desconocida. La leptospirosis humana presenta un rango de s&iacute;ntomas que van desde una fiebre indiferenciada hasta una ictericia, hemorragia, fallas renales y pulmonares severas. La administraci&oacute;n temprana e intravenosa de penicilina </i><i>G </i><i>es requerida para reducir las tasas de mortalidad, pero los antibi&oacute;ticos pueden no ser efectivos en la enfermedad pulmonar severa. En las Am&eacute;ricas, las &aacute;reas de alto riesgo son Brasil, Centroam&eacute;rica y el Caribe. En Colombia se han realizado pocos estudios. La prueba serol&oacute;gica de oro, la microaglutinaci&oacute;n, tiene alta sesibilidad y especificidad cuando se usan bater&iacute;as de serovariedades locales, pero es serogrupo espec&iacute;fica. Las vacunas generan respuestas espec&iacute;ficas para la serovariedad usada, pero no previenen la infecci&oacute;n o trasmisi&oacute;n. Problemas en el diagn&oacute;stico de laboratorio de la leptospirosis conllevan a un subregistro en el n&uacute;mero de casos; altas tasas de mortalidad asociadas a fallas renal y pulmonar son resultado de las dificultades en el manejo de los casos.</i></p>     <p><b>Palabras clave: </b><i>Leptospira, </i>clasificaci&oacute;n, leptospirosis, epidemiolog&iacute;a, presentaci&oacute;n cl&iacute;nica, diagn&oacute;stico, tratamiento.</p> <hr>     <p><b>Abstract</b></p>     <p>Leptospirosis, <i>the world's most important emerging bacterial zoonotic disease, is caused by pathogenic </i>Leptospira <i>species.</i></p>     <p><i>To review the latest information on </i>Leptospira <i>spp. and leptospirosis.</i></p>     <p><i>We reviewed PubMed indexed papers on leptospiral microbiology, epidemiology, clinical</i><i>human disease, diagnostics, treatment, and disease prevention (vaccines).</i></p>     <p><i>Twenty </i>Leptospira <i>species have been described and, although the genomic </i><i>DNA </i><i>sequences of</i><i>some pathogenic </i>Leptospira <i>spp. strains have been determined, the functions of most genes</i><i>involved in their pathogenicity remain unknown. Leptospirosis is displayed by a range of</i><i>symptoms from undifferentiated fever to severe jaundice, hemorrhage, renal and pulmonary failures. Pulmonary disease has the highest mortalities. An early intravenous penicillin </i><i>G </i><i>therapies is urgently required to reduce the mortality rates, but antibiotic therapy may not be effective in severe pulmonary disease. In the Americas, the highest risk areas are Brazil, Central America and the Caribbean islands. Few studies have however been performed in Colombia. The &quot;gold standard&quot; serological assay, the microscopic agglutination test </i><i>(MAT), </i><i>has a high sensitive and specificity when used with appropriate panels of </i>Leptospira <i>spp. serovars and it is serogroup specific. Vaccines, are administered to animals to generate serovar-specific protective responses, but may not prevent infection or transmission. Problems in the laboratory based diagnostics of leptospirosis result in under-reporting of the number of disease cases; the high mortality rates associated with severe renal and pulmonary failures result from difficulties in case management.</i></p>     <p><b>Keywords: </b><i>Leptospira, </i>classification, leptospirosis, clinical presentation, diagnostics, epidemiology, treatment.</p> <hr>     <p><b>INTRODUCCI&Oacute;N</b></p>     ]]></body>
<body><![CDATA[<p>La leptospirosis humana, causada por especies pat&oacute;genas del g&eacute;nero <i>Leptospira </i>spp., es la enfermedad bacteriana zoon&oacute;tica emergente de mayor importancia mundial, con altas incidencia en &aacute;reas urbanas y pobres de las zonas tropicales.</p>     <p>En esta revisi&oacute;n se presentan las caracter&iacute;sticas de la bacteria, los cambios recientes en la taxonom&iacute;a genot&iacute;pica y su asociaci&oacute;n con la clasificaci&oacute;n fenot&iacute;pica. Por otro lado, se realiza una descripci&oacute;n de la epidemiolog&iacute;a de la enfermedad, su presentaci&oacute;n cl&iacute;nica, con &eacute;nfasis en las Am&eacute;ricas y Colombia, diagn&oacute;stico, tratamiento sugerido y limitaciones de su uso y prevenci&oacute;n (vacunas).</p>     <p><b>Descripci&oacute;n de la bacteria</b></p>     <p>El g&eacute;nero <i>Leptospira, </i>del griego <i>leptos </i>(delgado) y del lat&iacute;n <i>spira </i>(espiral), comprende bacterias m&oacute;viles parecidas a sacacorchos y con forma de interrogaci&oacute;n; tienen una longitud de 6-20 um y un di&aacute;metro de 0,1 um (1). Son bacterias aerobias obligadas que crecen a una temperatura &oacute;ptima entre 28-30&deg;C y en un medio con pH que oscila entre 7.2 y 7.6, enriquecido con vitaminas, cadenas largas de &aacute;cidos grasos y sales de amonio, siendo el medio l&iacute;quido de cultivo Ellinghausen-McCullough-Johnson-Harris (EMJH) el m&aacute;s usado (1).</p>     <p>El g&eacute;nero <i>Leptospira </i>junto con los g&eacute;neros <i>Leptonema </i>y <i>Turnerella </i>pertenecen a la familia Leptospiracae del orden Spirochaetales, clase Spirochaetia y filo Spirochaetes (2). Antes de los a&ntilde;os 80 este g&eacute;nero comprend&iacute;a las especies <i>L. interrogans </i>y <i>L. biflexa, </i>que se agrupaban en cepas pat&oacute;genas aisladas de mam&iacute;feros y cepas sapr&oacute;fitas, aisladas de aguas frescas y suelos h&uacute;medos, respectivamente (3). La diferenciaci&oacute;n entre estas dos especies se realizaba de forma fenot&iacute;pica, basada en el crecimiento de leptospiras sapr&oacute;fitas a 13 &deg;C y en presencia de 8-azaguanina (1). A partir de 1987 la clasificaci&oacute;n de este g&eacute;nero se bas&oacute; en la homolog&iacute;a del ADN medida por t&eacute;cnicas de hibridaci&oacute;n (3,4), t&eacute;cnica est&aacute;ndar para la especiaci&oacute;n del g&eacute;nero <i>Leptospira; </i>sin embargo, la secuenciaci&oacute;n del ARN ribosomal (ARNr) 16S ha sido igualmente usada para este prop&oacute;sito, adem&aacute;s de la patogenicidad, virulencia y caracter&iacute;sticas de crecimiento <i>in vitro. </i>En la actualidad, el g&eacute;nero <i>Leptospira </i>comprende 21 especies, divididas en dos grupos: el grupo infeccioso, dividido en Grupo I (9 especies pat&oacute;genas) y Grupo II (5 especies pat&oacute;genas intermedias) y el grupo no infeccioso, que incluye las no pat&oacute;genas o sapr&oacute;fitas (6 especies, incluyendo la nueva especie <i>L. idonii </i>(5). Una especie adicional, <i>L. meyeri, </i>la componen serovares pat&oacute;genos y sapr&oacute;fitos (5, 6, 7, 8, 9) (tabla 1).</p>     <p>El genoma de las leptospiras est&aacute; distribuido en cromosomas circulares: uno grande, el cromosoma I, y otro peque&ntilde;o, el cromosoma II; con un rango de longitud aproximado entre 3500-4300 y 300-350 kb, respectivamente (20, 21, 22). Las leptopiras sapr&oacute;fitas poseen adem&aacute;s un tercer replic&oacute;n circular denominado p74, que ha sido relacionado con su sobrevivencia (22).</p>     <p>La diferencia en el tama&ntilde;o del genoma de la especie pat&oacute;gena <i>L. interrogans </i>serovar Copenhageni (4, 627, 366 pares de bases pb) (23) comparada con otra especie pat&oacute;gena, <i>L. borgpetersenii </i>serovar Hardjo (3,931,791 pb) (11), y con la especie sapr&oacute;fita <i>L. biflexa </i>serovar Patoc (3,956,088 pb) (22) reflejar&iacute;a la informaci&oacute;n gen&eacute;tica adicional requerida por <i>L. interrogans </i>para vivir tanto en el hu&eacute;sped mam&iacute;fero como en condiciones de vida libre, mientras que la reducci&oacute;n en el tama&ntilde;o del genoma de la especie <i>L. borgpetersenii </i>evidencia su evoluci&oacute;n a un ciclo de trasmisi&oacute;n estricto de hu&eacute;sped a hu&eacute;sped (21).</p>     <p>Se sugiere que los 1,431 genes presentes solamente en las especies pat&oacute;genas, ya sea en <i>L. interrogans </i>y/o <i>L. borgpetersenii, </i>podr&iacute;an codificar prote&iacute;nas asociadas a la virulencia; sin embargo, se desconoce la funci&oacute;n en el 62,4 % (893) de ellos (22, 23).</p>     <p>El primer factor gen&eacute;tico de virulencia reportado fue el gen de la lipoprote&iacute;na de superficie <i>Loa22, </i>altamente conservado en las leptospiras pat&oacute;genas y expresado en la fase aguda de la enfermedad. La p&eacute;rdida de la expresi&oacute;n de este gen en una cepa mutante de <i>L. interrogans </i>result&oacute; en la atenuaci&oacute;n de su virulencia en cobayos y hamsters (24).</p>     <p>Se detectaron cinco genes codificadores de esfingomielinasas; entre ellos el gen <i>sphA </i>y <i>sphH, </i>que codifica la esfingomielinasa C y la SphH, respectivamente, las cuales tienen funci&oacute;n de lisis celular de eritrocitos y contribuyen al da&ntilde;o del endotelio de peque&ntilde;os vasos (25).</p>     ]]></body>
<body><![CDATA[<p>Entre los factores putativos de colonizaci&oacute;n del tejido del hu&eacute;sped est&aacute;n las adhesinas; se han identificado los genes <i>lig (lig A </i>y <i>lig </i>B), que codifican prote&iacute;nas de superficie que contienen dominios parecidos a las inmunoglobulinas, las cuales se unen a la elastina, tropoelastina, laminina y fibronectina (26).</p>     <p>Genes que codifican prote&iacute;nas de membrana parecidas a la endostatina humana (prote&iacute;nas de la familia Len) se unen a la laminina, fibrin&oacute;geno y fibronectina (27) y el gen <i>lipL32, </i>que codifica la lipoprote&iacute;na, que fue considerada de superficie pero que se ha demostrado est&aacute; ubicada en la subsuperficie (28) LipL32&lt;; esta lipoprote&iacute;na est&aacute; altamente conservada en leptospiras pat&oacute;genas, se une al col&aacute;geno I, IV, V, laminina y a la fibronectina dependiente de calcio (29).</p>     <p>Otras prote&iacute;nas potencialmente involucradas en la patog&eacute;nesis de esta bacteria est&aacute;n siendo continuamente caracterizadas.</p>     <p>Las lipoprote&iacute;nas son el mayor componente de la membrana externa de las leptospiras, la cual es rica en lipopolisac&aacute;ridos (LPS) (30); variaciones en el ant&iacute;geno O, componente de los LPS de superficie, determinan la diversidad antig&eacute;nica en todas las especies de <i>Leptospira </i>(31). Mediante el uso de la prueba serol&oacute;gica de absorci&oacute;n de aglutinaci&oacute;n cruzada, estas especies han sido categorizadas en serovariedades. La serovariedad, adem&aacute;s de ser la unidad b&aacute;sica sistem&aacute;tica, tiene importancia epidemiol&oacute;gica por la asociaci&oacute;n que pueda tener con una especie animal con la que haya desarrollado una relaci&oacute;n comensal o levemente pat&oacute;gena (32).</p>     <p>Se cuenta con cepas de referencia de alrededor de 300 y 60 serovariedades de leptospiras pat&oacute;genas/pat&oacute;genas intermedias y sapr&oacute;fitas, respectivamente (33).</p>     <p>Las serovariedades que presentan aglutinaci&oacute;n cruzada han sido agrupadas en 25 serogrupos, que si bien no tienen un valor taxon&oacute;mico, poseen un valor pr&aacute;ctico, ya que los serovares representativos de cada serogrupo son utilizados en la prueba serol&oacute;gica de referencia para el diagn&oacute;stico de leptospirosis denominada prueba de aglutinaci&oacute;n microsc&oacute;pica (MAT), considerada serogrupo espec&iacute;fica (32).</p>     <p>Serogrupos y serovariedades asociados a las 21 especies de <i>Leptospira </i>spp. se presentan en la tabla 1; como fuente de informaci&oacute;n se tuvo un estudio en el que se representan 228 serovariedades determinadas por la prueba de oro (prueba de absorci&oacute;n de aglutinaci&oacute;n cruzada) y realizadas en 1999 (3) y los datos obtenidos de la tipificaci&oacute;n a nivel de sero variedad por electroforesis de campo pulsado de 175 aislamientos enviados al Center for Disease Control durante 2000 a 2007 (34).</p>     <p><b>Epidemiolog&iacute;a</b></p>     <p><i>Leptospira </i>se ha encontrado infectando un amplio rango de hu&eacute;spedes animales, especialmente mam&iacute;feros y algunos vertebrados de sangre fr&iacute;a (35).</p>     <p>Los reservorios o hu&eacute;spedes de mantenimiento de las leptospiras son aquellas especies animales infectadas cr&oacute;nicamente en los t&uacute;bulos renales proximales, a las cuales les causan poco o ning&uacute;n da&ntilde;o.</p>     ]]></body>
<body><![CDATA[<p>Las ratas han sido identificadas como hu&eacute;spedes de mantenimiento de las serovariedades Icterohaeomorrhagiae y Copenhageni; ratones de Arborea, Ballum y Bin; ganado vacuno de Pomona, Hardjo y Grippotyphosa; cerdos de Pomona, Tarassovi y Bratislava; perros de Canicola y marsupiales de Grippothyphosa (36, 37).</p>     <p>La identificaci&oacute;n de hu&eacute;spedes de mantenimiento y su asociaci&oacute;n con las especies animales cobra importancia al estudiar la epidemiolog&iacute;a de la trasmisi&oacute;n de la <i>Leptospira </i>spp. en una localidad, con el fin de direccionar las medidas de control.</p>     <p>Animales que act&uacute;an como hu&eacute;spedes de mantenimiento de unas serovariedades pueden ser hu&eacute;spedes accidentales de otras y sufrir la enfermedad. El humano es un hu&eacute;sped accidental y no se han reportado casos de infecci&oacute;n de persona a persona; sin embargo, una excreci&oacute;n de la <i>Leptospira </i>spp. hasta seis semanas despu&eacute;s de haberse recuperado de la infecci&oacute;n fue reportada recientemente (26).</p>     <p>La leptospirosisi es una enfermedad zoon&oacute;tica desatendida de origen bacteriano (38). Los factores de riesgo para la infecci&oacute;n en humanos incluyen la exposici&oacute;n directa o indirecta a orina o ambientes contaminados con la bacteria, ya sea por actividades relacionadas con la ocupaci&oacute;n (ganaderos, agricultores, granjeros, jardineros, carniceros), acu&aacute;ticas recreacionales o por nivel socioecon&oacute;mico (pobreza, deficiencia sanitaria (32).</p>      <p align="center"><img src="img/revistas/sun/v32n1/v32n1a11f01.jpg"></p>     <p align="center"><img src="img/revistas/sun/v32n1/v32n1a11f02.jpg"></p>       <p>La leptospirosis humana ha pasado de ser una enfermedad zoon&oacute;tica rural olvidada a una enfermedad emergente, y se presentan epidemias en comunidades urbanas pobres de pa&iacute;ses en desarrollo asociadas a altas precipitaciones, calentamiento global, deficiencia sanitaria, altas infestaciones de roedoresy presencia de perros callejeros (39-42), que se convierten en un problema de salud p&uacute;blica, principalmente en las zonas tropicales del mundo (43, 44).</p>     <p><b>Leptospirosis humana</b></p>     <p>Las infecciones en humanos pueden ocurrir de forma asintom&aacute;tica, o cursar como una enfermedad aguda febril bif&aacute;sica.</p>     <p>El per&iacute;odo de incubaci&oacute;n var&iacute;a entre 2 y 30 d&iacute;as; la fiebre, normalmente de 39 &deg;C, aparece de forma s&uacute;bita con dolor de cabeza, malestar general y dolor muscular, especialmente en las &aacute;reas lumbares y pantorrillas, inyecci&oacute;n de la conjuntiva y erupci&oacute;n cut&aacute;nea; estos s&iacute;ntomas permanecen alrededor de una semana, y se ha detectado leptospiras en sangre.</p>     ]]></body>
<body><![CDATA[<p>La fase inmune ocurre en la segunda semana y se detectan anticuerpos en sangre y leptospiras en orina. La enfermedad se autolimita o presenta un segundo pico febril y cualquiera de las siguientes complicaciones: dolor muscular severo, ictericia, falla renal y hemorragias (s&iacute;ndrome de Weil); miocarditis con arritmias y la presentaci&oacute;n de una cardiomiopat&iacute;a (confirmada por aislamiento de la bacteria y por estudios histopatol&oacute;gicos) pueden ser confundidas con cardiopat&iacute;as por enfermedad de Chagas, com&uacute;n en Latinoam&eacute;rica (45, 46), meningitis/meningo-encefalitis y disfunciones neurol&oacute;gicas.</p>     <p>Da&ntilde;o y falla renal agudos ocurren hasta en un 87 % de los pacientes (47- 49), y pueden presentarse sin ictericia (50).</p>     <p>Las hemorragias pueden ocurrir como petequias, p&uacute;rpura, hemorragia de la conjuntiva, hemorragia gastrointestinal y leptospirosis severa con hemorragia pulmonar (LSHP), siendo esta una de las formas severas menos conocidas de la leptospirosis, caracterizada por una hemorragia intraalveolar que puede llevar a una falla respiratoria aguda y puede presentarse en ausencia de ictericia.</p>     <p>La mortalidad por el s&iacute;ndrome de Weil y la LSHP puede alcanzar entre el 10 y el 50 %, respectivamente, y se estima una cifra superior a 500 000 casos severos anualmente (32, 36, 51, 52).</p>     <p><b>Leptospirosis en las Am&eacute;ricas y el impacto de la leptospirosis severa con hemorragia pulmonar (LSHP)</b></p>     <p>Tres subregiones en las Am&eacute;ricas han sido consideradas de alto riesgo para la presentaci&oacute;n de brotes de leptospirosis humana, debido a sus caracter&iacute;sticas ambientales y humanas: la zona oriental de Brasil, con extensa deforestaci&oacute;n, minifundios, migraci&oacute;n urbana, ganader&iacute;a; el Caribe, por su turismo, deforestaci&oacute;n y migraci&oacute;n urbana, y Am&eacute;rica Central, por problemas de deforestaci&oacute;n y migraci&oacute;n (53). Sin embargo, datos sobre la prevalencia de la enfermedad y los a&ntilde;os de vida saludable perdidos por incapacidad no han sido estimados todav&iacute;a, ya que esta enfermedad ha sido incluida progresivamente en la lista de enfermedades de notificaci&oacute;n obligatoria en la mayor&iacute;a de los pa&iacute;ses de la regi&oacute;n a lo largo de la d&eacute;cada 2000 - 2010 (consulta de los ministerios de salud de cada pa&iacute;s de las Am&eacute;ricas).</p>     <p>Seg&uacute;n una revisi&oacute;n sobre la tendencia de la incidencia de la enfermedad en el mundo, 12 de los 20 primeros puestos corresponden a pa&iacute;ses de lasAm&eacute;ricas (ocho en Centroam&eacute;rica), y Trinidad y Tobago, Barbados y Jamaica ocupan los primeros tres puestos de la regi&oacute;n, con una incidencia anual por mill&oacute;n de 120,4, 100,3 y 78 casos, respectivamente (54).</p>     <p>La forma cl&iacute;nica m&aacute;s reconocida de la leptospirosis es la severa, que se presenta con ictericia, esplenomegalia y nefritis, com&uacute;nmente conocida como enfermedad de Weil, en honor a Adolf Weil, quien la describi&oacute; por primera vez en 1886; sin embargo, su forma anict&eacute;rica es la m&aacute;s frecuente, y se present&oacute; en el 90-95 % de los casos (36).</p>     <p>Seg&uacute;n datos divulgados por la Organizaci&oacute;n Mundial de la Salud (OMS), a trav&eacute;s del reporte de la carga epidemiol&oacute;gica de la leptospirosis (55), se ha estimado que en el mundo la incidencia media anual de esta enfermedad es de cinco casos por 100 000 habitantes. &Aacute;frica, Pac&iacute;fico Occidental y las Am&eacute;ricas son las regiones con las mayores incidencias medias, correspondiendo a 95,5, 66,4 y 12,5 casos por 100 000 habitantes, respectivamente. Otras fuentes reportan hasta 500 000 muertes anuales en el mundo (42).</p>     <p>Sin embargo, el comit&eacute; de expertos de la OMS recomienda tomar con cautela estos datos, teniendo en cuenta el n&uacute;mero limitado de estudios disponibles para la obtenci&oacute;n de los mismos, y el hecho de que esta enfermedad presenta en &aacute;reas end&eacute;micas altos subregistros, ya que puede ser confundida con patolog&iacute;as de presentaci&oacute;n cl&iacute;nica similar, como la influenza, la malaria, el dengue, la fiebre amarilla, el hantavirus, la rickettsiosis, la brucelosis, borreliosis, la hepatitis, la meningitis as&eacute;ptica y la neumon&iacute;a (32, 42).</p>     ]]></body>
<body><![CDATA[<p>La presentaci&oacute;n cl&iacute;nica de las formas severas de enfermedad en las Am&eacute;ricas ha sido documentada en su mayor&iacute;a en Brasil, Per&uacute; y Nicaragua, en epidemias ocurridas despu&eacute;s de eventos de inundaci&oacute;n y predominantemente en &aacute;reas urbanas (tabla 2), con presentaci&oacute;n de casos de LSHP y en menor n&uacute;mero otras formas severas, siendo los hombres los m&aacute;s afectados en su edad adulta; se registra mortalidad a pesar de manejo agresivo con antibi&oacute;ticos y cuidados intensivos. La mayor&iacute;a de las serovariedades pertenecen a <i>L. interrogans </i>serogrupo Icterohaemorrhagiae.</p>     <p>Los primeros casos de LSHP fueron reportados en Brasil (56) y en Nicaragua (1995) (57); en esta &uacute;ltima, la LSHP se present&oacute; con hemorragia pulmonar, hemoptisis y disnea pero sin ictericia ni manifestaciones renales, los pacientes habitaban zonas rurales y se aisl&oacute; <i>L. interrogans </i>serovariedad Canicola.</p>     <p>En Per&uacute; (2003-2004), la LSHP se present&oacute; con hemoptisis y no se reportaron casos cl&iacute;nicos t&iacute;picos con s&iacute;ndrome de Weil; las serovariedades Icterohaeomorrhagiae y Canicola fueron aisladas (58).</p>     <p>En otros dos estudios realizados en &aacute;reas urbanas de Brasil se compar&oacute;la LSHP con otras formas severas en la ciudad de Salvador (2003-2005) (59) y la LSHP entre adultos y ni&ntilde;os en Sao Paulo (2004-2006) (60).</p>     <p>En el primer estudio, el n&uacute;mero de muertes, la hemoptisis y la oliguria fueron predominantes en el grupo de LSHP, y las diferencias con respecto al grupo que present&oacute; otras formas severas fueron significativas. La ictericia y la trombocitopenia se presentaron con porcentajes similares en los dos grupos.</p>     <p>En el segundo estudio se encontr&oacute; que la ictericia, oliguria y niveles altos de bilirrubina y creatinina (valores no mostrados en la tabla) y la muerte fueron estad&iacute;sticamente m&aacute;s significativos en adultos que en ni&ntilde;os (tabla 2).</p>     <p>La descripci&oacute;n de otras formas severas de leptospirosis humana en las Am&eacute;ricas fue realizada en Salvador (Brasil) en 1996 (61), donde la ictericia, oliguria y una marcada trombocitopenia fueron los signos m&aacute;s caracter&iacute;sticos de esta epidemia, con aislamiento de <i>L. interrogans </i>serovariedad Copenhageni (tabla 2). Inicialmente esta epidemia fue confundida con dengue; sin embargo, la fiebre hemorr&aacute;gica por Hantavirus, serotipo Seoul, tiene la misma presentaci&oacute;n cl&iacute;nica, circula en &aacute;reas urbanas y sus reservorios <i>Rattus rattus </i>y R. <i>norvegicus; </i>esta etiolog&iacute;a debe ser tambi&eacute;n incluida en el diagn&oacute;stico diferencial.</p>     <p>Los resultados de este trabajo y otro m&aacute;s reciente (62) han permitido concluir que un estado mental alterado, edad superior a 37 a&ntilde;os, insuficiencia renal (oliguria) y respiratoria, trombocitopenia (&lt; 70 000 plaquetas / uL), creatinina &gt; 3 mg/dL son predictores de muerte en los casos severos de leptospirosis (61).</p>     <p><b>Leptospirosis humana en Colombia</b></p>     <p>El primer registro de leptospirosis humana severa fue reportado en 1966 (63), y la primera epidemia urbana de leptospirosis severa ocurri&oacute; en Barranquilla (Colombia) en 1995, durante un per&iacute;odo de inundaci&oacute;n; cuatro muertes fueron reportadas, y por la t&eacute;nica de MAT, el serogrupo presuntivo de la epidemia fue el Icterohaemorrhagiae (64, 65).</p>     ]]></body>
<body><![CDATA[<p>Estudios de seroprevalencia han sido realizados con la t&eacute;cnica de MAT en sujetos sanos de diferentes &aacute;reas de Colombia, con seroprevalencias entre 12.0 % en Urab&aacute; (Antioquia) (66) hasta 23.3 % en Cali (67).</p>     <p>La caracterizaci&oacute;n cl&iacute;nica de la leptospirosis humana en Colombia ha sido realizada en pocos estudios; los datos de vigilancia rutinaria est&aacute;n disponibles apenas desde 2010. El n&uacute;mero de casos de leptospirosis registrados en la vigilancia rutinaria del Sistema Nacional de Vigilancia en Salud P&uacute;blica (Sivigila) aparece desde 2010 (<a href="http://www.ins.gov.co/lineasdeaccion/SubdireccionVigilancia/sivigila/Estad&iacute;sticas" target="_blank">http://www.ins.gov.co/lineasdeaccion/SubdireccionVigilancia/sivigila/Estad&iacute;sticas</a>)(68). Los entes territoriales con mayor n&uacute;mero de casos preliminares reportados son Antioquia y Barranquilla para 2010; Valle y Antioquia para 2011 y Antioquia y Cesar para 2012 a la >semana 38 (68, 69, 70).</p>     <p>En general, las formas anict&eacute;ricas son las predominantes, y la fiebre, cefalea, mialgias e ictericia son las presentaciones cl&iacute;nicas m&aacute;s frecuentes, y se pueden confundir con dengue; no se ha reportado casos de LSHP, y el serogrupo incriminado en la mayor&iacute;a de los reportes ha sido el Icterohaemorrhagiae.</p>     <p>En un estudio realizado en el departamento del Atl&aacute;ntico (1999-2004), la prevalencia en humanos fue del 9,7 %, y los s&iacute;ntomas m&aacute;s frecuentes fueron fiebre, mialgias, cefalea e ictericia; el 8,6 % de estos casos presentaron s&iacute;ndrome de Weil, pero no se registraron muertes; la mayor&iacute;a de los casos se presentaron en hombres; el serogrupo presuntivo predominante fue el Icterohaemorrhagiae (71).</p>     <p>En un segundo estudio realizado en Barranquilla (2007- 2009), la infecci&oacute;n fue confirmada en un 12.5 %, la mayor&iacute;a de los casos sin ictericia (87.5 %), y los s&iacute;ntomas m&aacute;s frecuentes fueron fiebre, cefalea, dolor ocular y n&aacute;usea/v&oacute;mito. El 6.3 % desarroll&oacute; da&ntilde;o hep&aacute;tico y un caso probable muri&oacute; con s&iacute;ndrome de Weil. Los serogrupos presuntivos m&aacute;sfrecuentes fueron Australis, Sarmin, Icterohaemorrhagiae y Tarassovi (15).</p>     <p>En otro estudio realizado en Quind&iacute;o (20052006) se confirm&oacute; la infecci&oacute;n con <i>Leptospira </i>spp. en el 26.7 % de los casos sospechosos, en su mayor&iacute;a adultos, y se reportaron 4 muertes relacionadas con alteraciones de la funci&oacute;n hep&aacute;tica. Los s&iacute;ntomas m&aacute;s frecuentes fueron fiebre, mialgias, cefalea e ictericia; el serogrupo presuntivo circulante en esta poblaci&oacute;n fue el Icterohaemorrhagiae (72).</p>     <p>Durante 2008 a 2012, 8,33 % (22/264) de los casos sospechosos provenientes de Pereira fueron confirmados por ELISA y MAT, predomiantemente en hombres que viven en &aacute;reas urbanas (91 %). De los casos confirmados, el 72 % fue hospitalizado, pero no se registr&oacute; muertes. Los serogrupos presuntnivos fueron identificados como Australis, Icterohae-morrhagiae, Canicola, Panama, Pomona y Gryppothyphosa (73).</p>     <p><b>Diagn&oacute;stico en humanos</b></p>     <p>El diagn&oacute;stico diferencial de lepospirosis debe incluir enfermedades prevalentes de la localidad. Cuando se presenta una fiebre debe incluirse la malaria, riciketsias, infecciones por arbovirus (dengue, fiebre amarilla, etc.) y el virus de la influenza como posibles agentes etiol&oacute;gicos. En los casos en los que se presente complicaci&oacute;n pulmonar debe diferenciarse de infecciones con dengue y hantavirus. Las formas hemorr&aacute;gicas deben ser diferenciadas de otras fiebres hemorr&aacute;gicas de origen viral o bacteriano. Sin embargo, en el diagn&oacute;stico diferencial, estas patolog&iacute;as son subregistradas o mal diagnosticadas debido a la carencia de laboratorios adecuadamente equipados y personal capacitado.</p>     <p>Se han documentado eventos de coinfecciones de leptospira-dengue, por lo que resultar&iacute;a posible encontrar pacientes con coinfecciones.</p>     ]]></body>
<body><![CDATA[<p>Solo cinco casos de leptospirosis se han demostrado serol&oacute;gicamente en las infecciones con virus dengue (74-77), las cuales no fueron confirmadas por TR-PCR (Transcriptasa Reversa Reacci&oacute;n en Cadena de la Polimerasa) o aislamiento viral, por lo cual los serotipos del virus dengue no fueron identificados.</p>     <p><b>Diagn&oacute;stico serol&oacute;gico</b></p>     <p>El diagn&oacute;stico de las infecciones con <i>Leptospira </i>spp. es usualmente realizado con pruebas serol&oacute;gicas y por aislamiento. La prueba serol&oacute;gica de oro es la microaglutinaci&oacute;n (MAT), vista con un microscopio de campo oscuro, en el que los anticuerpos de los sueros de los pacientes aglutinan leptospiras vivas de una bater&iacute;a de serovariedades de referencia (incluyendo idealmente serovariedades caracterizados de la localidad de donde provienen los pacientes) representantes de los principales serogrupos pat&oacute;genos.</p>     <p>En esta prueba, un caso confirmado se define por la seroconversi&oacute;n o un incremento de cuatro veces o m&aacute;s en el t&iacute;tulo de anticuerpos de la muestra de la fase convaleciente, comparado con los t&iacute;tulos de la muestra de la fase aguda (36). En caso de disponer de muestras &uacute;nicas, es un caso probable si el paciente tiene una presentaci&oacute;n cl&iacute;nica compatible con la enfermedad y/o tiene un historial epidemiol&oacute;gico.</p>     <p>El punto de corte para los t&iacute;tulos de anticuerpos en la MAT se determina seg&uacute;n el &aacute;rea de procedencia del paciente (no end&eacute;mica o end&eacute;mica), que var&iacute;a entre 1&gt;100 (no end&eacute;mica) o &gt;1:200 o 1:400 o 1:800 (end&eacute;mica) (30).</p>     <p>El MAT puede ser negativo en muestras &uacute;nicas colectadas en la fase aguda de la enfermedad o cuando no se disponen de las serovariedades locales. Esta prueba indica presuntivamente los serogrupos circulantes en la poblaci&oacute;n, teniendo en cuenta que pueden ocurrir reacciones cruzadas entre ellos (32); adicionalmente se ha demostrado que el MAT no puede ser usado como predictor confiable de la serovariedad infectante (68).</p>     <p>Otros m&eacute;todos serol&oacute;gicos incluyen la detecci&oacute;n de igM por ELISA; generalmente negativo los cinco primeros d&iacute;as de la enfermedad. Esta prueba es generalmente positiva antes que el MAT (37).</p>     <p><b>Aislamiento</b></p>     <p>Otra prueba de oro es el aislamiento de la <i>Leptospira </i>spp. de muestras de sangre, l&iacute;quido cefaloraqu&iacute;deo o fluidos corporales durante los primeros 10 d&iacute;as de la enfermedad, o de muestras de orina en la fase inmune de la misma; estas muestras se inoculan en medio de cultivo (el m&aacute;s usado es el Ellinghausen-McCullough-Johnson -Harris (EMJH)), mantenidos a una temperatura entre 28-30 &deg;C.</p>     <p>El crecimiento de las leptospiras es lento y puede tomar hasta cuatro meses; adem&aacute;s del cocrecimiento de otras bacterias (37), que hacen a esta prueba insensible y no oportuna para el manejo del paciente.</p>        ]]></body>
<body><![CDATA[<p>La utilidad de esta prueba radica en que se puede tipificar el aislamiento obtenido a nivel de serovariedad y posteriormente ser usado en la bater&iacute;a diagn&oacute;stica de serovariedades. Tambi&eacute;n es importante, desde el punto de vista de salud p&uacute;blica, porque sirve para identificar la fuente de infecci&oacute;n animal, que es un aporte importante para enfocar apropiadas medidas de control.</p>     <p><b>Detecci&oacute;n Directa</b></p>     <p>Por otro lado, la detecci&oacute;n temprana de esta infecci&oacute;n puede realizarse mediante la observaci&oacute;n directa de la bacteria en las muestras biol&oacute;gicas, usando el microscopio de campo oscuro o mediante el uso de pruebas de reacci&oacute;n en cadena de la polimerasa (PCR).</p>     <p>La primera t&eacute;cnica ha demostrado tener baja sensibilidad y la fibrina en la sangre puede dar falsos positivos (36).</p>     <p>Se han desarrollado pruebas de PCR basados en el gen <i>rrs </i>(79) g&eacute;nero espec&iacute;fico o PCR, que detectan leptospiras pat&oacute;genas, y amplificando el gen <i>secY </i>y <i>flaB </i>(80), el gen <i>lipL32 </i>(81) o gyrB (82).</p>     <p>La utilidad de la PCR radica en que permite una detecci&oacute;n temprana de la leptospirosis, de modo que el paciente puede recibir una terapia con antibi&oacute;ticos de una manera oportuna; y si se trata de una RCP en tiempo real, aumenta la sensibilidad, detectando exitosa y r&aacute;pidamente leptospiras en sangre y orina (81).</p>     <p><b>Comparaci&oacute;n de pruebas</b></p>     <p>En una publicaci&oacute;n de revisi&oacute;n (42) se compararon las pruebas diagn&oacute;sticas m&aacute;s com&uacute;nmente usadas en t&eacute;rminos de sensibilidad, costos, ventajas/desventajas, y se encontr&oacute; que la prueba m&aacute;s sensible es la PCR en tiempo real (100 %); pero tiene la desventaja de ser la m&aacute;s costosa (hasta 100 euros), no haber sido ampliamente validada y requerir equipo especializado. La menos sensible fue el cultivo (5-50%), a pesar de ser econ&oacute;mica (20 euros). La IgM ELISA comercial es la m&aacute;s costo- efectiva, con una sensibilidad &gt;90 % y un valor entre 9 y 16 euros, pero con la desventaja que llega a ser positiva entre 7 y 10 d&iacute;as despu&eacute;s de la presentaci&oacute;n de los s&iacute;ntomas, lapso que resulta tard&iacute;o para el inicio de la terapia con antibi&oacute;ticos.</p>     <p><b>Tipificaci&oacute;n de aislamientos</b></p>     <p>Tradicionalmente la caracterizaci&oacute;n a nivel de serovariedad se realiza mediante el uso de la prueba de aglutinaci&oacute;n absorci&oacute;n cruzada (1). Sin embargo, t&eacute;cnicas moleculares como la electroforesis de campo pulsado pueden identificar aislamientos de leptospira hasta el nivel de serovariedad e identificar nuevas serovariedades (34, 83, 84), como las tipificadas por primera vez en Colombia en los departamentos de C&oacute;rdoba y Atl&aacute;ntico (85); con esta t&eacute;cnica, sin embargo, la serovariedad Icterohaemorrhagiae no puede ser diferenciada de la Copenhageni.</p>     ]]></body>
<body><![CDATA[<p>Otra t&eacute;cnica que puede identificar hasta el nivel de serovariedad es la repetici&oacute;n en t&aacute;ndem de n&uacute;mero variable de multilocus (en ingl&eacute;s <i>Multilocus variable-number tandemrepeat </i>(MVNTR); pero tiene la desventaja de que requiere cebadores espec&iacute;ficos para cada especie de <i>Leptospira </i>spp. (86).</p>     <p>Otras t&eacute;cnicas moleculares que tipifican aislamientos a nivel de especie y son usadas en estudios epidemiol&oacute;gicos son: 1) huellas de ADN ribosomal <i>(ribosomal DNAfingerprinting) (87), 2) fragmentos de restricci&oacute;n polim&oacute;rfica <i>(restriction fragment length polymorphisms </i>(RFLPs) (88), 3) determinaci&oacute;n de secuencias y an&aacute;lisis del ADN complementario del gen que codifica la 16S rRNA (5), y 4) tipificaci&oacute;n por secuenciaci&oacute;n de m&uacute;ltiples loci <i>(multilocus sequence typing </i>(MLST)) (89).</p>     <p><b>Tratamiento y prevenci&oacute;n</b></p>     <p>El tratamiento de la leptospirosis se basa principalmente en la administraci&oacute;n de antibi&oacute;ticos y terapia de apoyo. Si bien ha generado debate el hecho que el uso de antib&oacute;ticos en pacientes con LSHP no ha reducido la mortalidad (90-94), es aceptado que la terapia temprana con antibi&oacute;tico disminuye el tiempo de estancia hospitalaria, la leptospiremia y las tasas de mortalidad (47).</p>     <p>La administraci&oacute;n por v&iacute;a intravenosa de la penicilina G es considerada la terapia apropiada para el tratamiento en ni&ntilde;os (94), por reducir la magnitud del problema renal y la trombocitopenia (47). Estudios anteriores mostraron que no hubo diferencias significativas en cuanto a la duraci&oacute;n de la disfunci&oacute;n org&aacute;nica o las tasas de mortalidad de pacientes con leptospirosis severa tratados con ceftriaxone (1g/d&iacute;a/7d&iacute;as) por v&iacute;a intravenosa comparado con penicilina G (1.5 millones IUs cada 6 horas/7 d&iacute;as) (95) o en pacientes tratados con cefotaxima (1g cada 6 horas, o doxiciclina (200 mg seguido por 100 mg cada 12 horas) o penicilina G (1.5 millones IUs cada 6 horas) (96).</p>     <p>Aparte de la ventaja que tiene usar estos medicamentos alternativos a la terapia con penicilina G en pacientes sensibles a esta &uacute;ltima, el amplio espectro de la ceftriaxona y cefotaxima contra otras bacterias Gram negativas y la actividad de la doxiciclina contra las ricketsias son apropiadas en &aacute;reas en las que hay cociruclaci&oacute;n de estas patolog&iacute;as.</p>     <p>Se debe tener en cuenta la presentaci&oacute;n y tratamiento de la reacci&oacute;n de Jarisch-Herxheimer en pacientes tratados con antibi&oacute;ticos (97). La doxiciclina ha sido administrada exitosamente como profilaxis en soldados que viajan a &aacute;reas de alto riesgo para la leptospirosis (90) o en su administraci&oacute;n masiva a 280 000 personas durante una epidemia en per&iacute;odo inundaci&oacute;n (98).</p>     <p>Pacientes con da&ntilde;o renal agudo deben recibir una dieta baja en prote&iacute;nas y alta en carbohidratos y un apropiado manejo con fluidos, dependiendo del grado de deshidrataci&oacute;n e hipotensi&oacute;n (99). La falla renal, estado severo, debe ser tratada con hemodi&aacute;lisis diarias (100), pero la plasmaferesis o hemofiltraci&oacute;n son recomendadas como mejores opciones (101).</p>     <p>La miocarditis en pacientes con leptospirosis requiere terapias cardiol&oacute;gicas espec&iacute;ficas, mientras que la hemorragia y/o trombocitopenia requiere trasfusiones de sangre o plaquetas (102).</p>     <p>La identificaci&oacute;n de pacientes con LSHP es realizada por radiograf&iacute;as de t&oacute;rax o tomograf&iacute;as computarizadas de alta resoluci&oacute;n (103); estos pacientes reciben la ventilaci&oacute;n mec&aacute;nica como terapia de apoyo. Hay evidencias de que el intercambio de plasma y el uso de altas dosis de metilprednisolona puede incrementar las tasas de sobrevivencia en estos pacientes (51), mientras que los pacientes con s&iacute;ndrome de distr&eacute;s respiratorio agudo (SDRA) han mejorado su pron&oacute;stico mediante el uso de ventilaci&oacute;n mec&aacute;nica asistida con un volumen tidal bajo y con terapia de reclutamiento alveolar (103).</p>        ]]></body>
<body><![CDATA[<p>Las vacunas preparadas de leptospiras enteras muertas con formalina previenen la enfermedad, pero es importante seleccionar las serovariedades prevalentes de acuerdo con cada regi&oacute;n, ya que la protecci&oacute;n es espec&iacute;fica para la serovariedad empleada, adem&aacute;s de ser de corta duraci&oacute;n, por lo cual se necesitan varias dosis.</p>     <p>Las &uacute;nicas vacunas licenciadas se limitan a los humanos, ganado vacuno, porcino y perros (104).</p>     <p>La mayor&iacute;a de estas vacunas han sido usadas con prop&oacute;sitos veterinarios y deben prevenir el estado portador de estos animales; pero no es el caso de la vacuna con c&eacute;lulas completas inactivadas de <i>Leptospira interrogans, </i>serovariedad Canicola usada en perros (105).</p>     <p>Si bien no se observ&oacute; el estado portador en cachorros de perros vacunados con dos dosis de la vacuna bivalente compuesta de <i>Leptospira interrogans, </i>serovariedades Icterohaemorrhagiae y Canicola despu&eacute;s de haber sido retados con altas dosis de las dos serovariedades (106), el 12.5 % de los perros adultos desarrollaron el estado portador 14 meses despu&eacute;s de haber recibido la segunda dosis de la vacuna (107).</p>     <p>Vacunas tetravalentes que incorporan a las serovariedades de <i>Leptospira interrogans </i>Icterohaemorrhagiae y Canicola, las serovariedades Bratislava y Grippotyphosa (108) o Bratislava y Pomona (109), han sido recomendadas en la administraci&oacute;n de vacunas a perros en Europa; mientras que en Estados Unidos recomiendan agregar las serovariedades Grippotyphosa y Pomona (110).</p>     <p>Se ha demostrado que las vacunas tetravalentes para perros protegen contra la infecci&oacute;n hasta por 12 meses (111).</p>     <p>M&uacute;ltiples serovariedades (Pomona, Icterohaemorrgiae, Canicola, Grippotyphosa y Hardjo) han sido incluidas en las vacunas pentavalentes de ganado vacuno y porcino; en este &uacute;ltimo, la serovariedad Copenhageni ha sido tambi&eacute;n utilizada reemplazando a la serovariedad Hardjo (112).</p>     <p>La inmunizaci&oacute;n humana se ha administrado a poblaciones en alto riesgo, pero su aplicaci&oacute;n se ha limitado a pa&iacute;ses como Francia, China, Corea, y en las Am&eacute;ricas, en Cuba (113).</p>     <p>Debido a la presentaci&oacute;n de reacciones adversas en el sitio de la vacunaci&oacute;n, prote&iacute;nas recombinantes de membrana, lipoprote&iacute;nas, lipopolisac&aacute;ridos y ADN han sido evaluados como vacunas candidatas (114-120). Entre estas est&aacute;n las prote&iacute;nas recombinantes</p>     <p>LIC10325 y LIC13059 (110), LigA (119); la</p>     ]]></body>
<body><![CDATA[<p>prote&iacute;na Lip32 recombinante acoplada con la subunidad B de toxinas bacterianas ha mostrado resultados promisorios (120,121).</p>     <p><b>Conclusiones</b></p>     <p>De la revisi&oacute;n realizada sobre diferentes aspectos concernientes a la bacteria <i>Leptospira </i>spp. y la enfermedad que produce se concluye lo siguiente:</p>     <p>La diversidad gen&eacute;tica del g&eacute;nero <i>Leptospira </i>spp. ha determinado que este g&eacute;nero, inicialmente clasificado en dos especies: <i>L.interrogans </i>y <i>L.biflexa, </i>cuenta por ahora con 20 especies, que por su plasticidad gen&eacute;tica se agrupan en los clados de leptospiras pat&oacute;genas, pat&oacute;genas intermedias y sapr&oacute;fitas, que le permiten a esta bacteria vivir en condiciones de vida libre (sapr&oacute;fitas), adaptarse a vivir en los ri&ntilde;ones de animales y vida libre (pat&oacute;genas, pat&oacute;genas intermedias).</p>        <p>A pesar de disponer del genoma completo de algunas especies pat&oacute;genas de <i>Leptospira </i>spp., a&uacute;n falta por determinar en aproximadamente el 64 % de los genes la funci&oacute;n de los que eventualmente pudieran codificar prote&iacute;nas asociadas a la virulencia.</p>     <p>El n&uacute;mero de serovariedades de <i>Leptospira </i>spp. pat&oacute;gena va en incremento, ya que su tipificaci&oacute;n se hace posible por el uso de t&eacute;cnicas moleculares r&aacute;pidas, en comparaci&oacute;n con las t&eacute;cnicas serol&oacute;gicas. Este conocimiento permite determinar fuentes de infecci&oacute;n, enfocar medidas de control y mejorar la sensibilidad de la prueba serol&oacute;gica de oro, la MAT, usando un panel de aislamientos tipificados del &aacute;rea de donde se obtiene el aislamiento.</p>     <p>El incremento de los eventos de inundaci&oacute;n como producto del cambio clim&aacute;tico favorece la ocurrencia de epidemias, especialmente en &aacute;reas urbanas y pobres, a nivel global y en las Am&eacute;ricas en Brasil, Centroam&eacute;rica y Caribe.</p>     <p>Las infecciones con <i>Leptospira </i>spp. en humanos pueden ser confundidas con influenza, malaria, dengue, fiebre amarilla, hantavirus (pulmonar y hemorr&aacute;gico), rickettsiosis, brucelosis, borreliosis, hepatitis, meningitis as&eacute;ptica, neumon&iacute;a e incluso con la cardiopat&iacute;a chag&aacute;sica.</p>     <p>Las tasas de mortalidad debido a la LSHP ahora exceden a la observada con el s&iacute;ndrome de Weil, especialmente en las Am&eacute;ricas, donde afecta principalmente a hombres en edad adulta. Los ni&ntilde;os con cuadros severos parecidos a los adultos presentan una tasa menor de mortalidad.</p>     <p>Una terapia temprana con penicilina G, cefotaxina, ceftriaxone o doxiciclina puede reducir la severidad de la enfermedad y el n&uacute;mero de d&iacute;as de hospitalizaci&oacute;n, pero hasta ahora no se ha demostrado su efectividad en pacientes con LSHP.</p>     ]]></body>
<body><![CDATA[<p>La prueba de oro para el diagn&oacute;stico de infecciones con <i>Leptospira </i>spp. es altamente sensible si se usa un panel adecuado de serovariedades; sin embargo, esta prueba es serogrupo espec&iacute;fica, y se ha demostrado que no identifica la serovariedad infectante. Adem&aacute;s, debido a las reacciones cruzadas entre serogrupos, el diagn&oacute;stico es presuntivo.</p>     <p>Por su alta sensibilidad y bajo costo se recomienda el uso de la IgM-ELISA, la cual detecta la IgM incluso antes que la prueba MAT.</p>     <p>La vacunaci&oacute;n de perros y otros animales previene la enfermedad pero no previene la infecci&oacute;n o trasmisi&oacute;n. La vacuna hasta ahora es espec&iacute;fica solamente para las serovariedades utilizadas.</p>     <p>Problemas en el diagn&oacute;stico cl&iacute;nico y de laboratorio de la leptospirosis en la mayor&iacute;a de los pa&iacute;ses end&eacute;micos afectan el reporte y las estad&iacute;sticas reales de la ocurrencia; por lo cual es una enfermedad olvidada tanto para los tomadores de decisiones en el &aacute;rea de la salud como para los tomadores de decisiones en las agencias financiadoras de la investigaci&oacute;n en nuestros pa&iacute;ses.</p>     <p><b>Agradecimientos: </b>A Rosmery Llanos por la b&uacute;squeda de informaci&oacute;n en cada uno de los ministerios de salud de los pa&iacute;ses de las Am&eacute;ricas; a Galo Mantilla y a la Dra. Lila Visbal de la Universidad del Norte, por sus comentarios en la secci&oacute;n de leptospirosis humana y tratamiento.</p>     <p><b>Financiaci&oacute;n: </b>Esta revisi&oacute;n se realiz&oacute; como actividad del proyecto interno de investigaci&oacute;n sobre leptospirosis, otorgado por la Direcci&oacute;n de Investigaciones, Desarrollo e Innovaci&oacute;n de la Universidad del Norte.</p>     <p><b>Conflicto de intereses: </b>ninguno.</p> <hr>     <p><sup><a name="num*"></a><a href="#nu*">*</a></sup>Esta revisi&oacute;n se realiz&oacute; como actividad del proyecto interno de investigaci&oacute;n sobre leptospirosis, otorgado por la Direcci&oacute;n de Investigaciones, Desarrollo e Innovaci&oacute;n de la Universidad del Norte.</p> <hr>     <p><b>Referencias</b></p>     <!-- ref --><p>1.&nbsp;Faine S, Adler B, Bolin C, Perolat P. A brief history of leptospirosis. En: Faine S, Adler B, Bolin C, Perolat P, editors. <i>Leptospira and leptospirosis. </i>2<sup>a</sup> ed. 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