<?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>0301-5092</journal-id>
<journal-title><![CDATA[Veterinaria México]]></journal-title>
<abbrev-journal-title><![CDATA[Vet. Méx]]></abbrev-journal-title>
<issn>0301-5092</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina Veterinaria y Zootecnia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0301-50922012000100006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Excreción fecal de Salmonella Albany, su aislamiento en la ración alimenticia y repercusión en el estado de salud de un ocelote (Leopardus pardalis) en cautiverio]]></article-title>
<article-title xml:lang="en"><![CDATA[Fecal excretion of Salmonella Albany, its isolation in the diet and health repercussion on an ocelot (Leopardus pardalis) in captivity]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva-Hidalgo]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Moreno]]></surname>
<given-names><![CDATA[Héctor Samuel]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Navarrete]]></surname>
<given-names><![CDATA[Vianney F.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Juárez-Barranco]]></surname>
<given-names><![CDATA[Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Valenzuela]]></surname>
<given-names><![CDATA[Martín]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de Sinaloa Facultad de Ciencias Químico-Biológicas ]]></institution>
<addr-line><![CDATA[Culiacán Sinaloa]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Sinaloa Facultad de Ciencias Químico-Biológicas ]]></institution>
<addr-line><![CDATA[Culiacán Sinaloa]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados (Cinvestav) ]]></institution>
<addr-line><![CDATA[ DF]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Autónoma de Sinaloa Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Culiacán Sinaloa]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2012</year>
</pub-date>
<volume>43</volume>
<numero>1</numero>
<fpage>59</fpage>
<lpage>69</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0301-50922012000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0301-50922012000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0301-50922012000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Salmonella enterica serotypes are 99% responsible for salmonellosis in human and animals, especially Salmonella enterica serovar Albany that has been identified in chicken carcass representing a risk for human and animal health. Salmonella enterica serovar Albany was isolated from the feces of a male ocelot (Leopardus pardalis), at the zoo in Culiacan, Sinaloa, Mexico, and from raw chicken (feline's diet). The pulsed-field gel electrophoresis pattern (PFGE) generated by Xba I enzyme was identical in both isolates, indicating that the source of infection was the raw chicken. Five months after having isolated the bacteria from the feces, a post mortem study was carried out on the feline. Macroscopically, severe hemorrhagic enterocolitis and renal fibrosis was observed and microscopically, there was evidence of severe mononuclear lymphocytic infiltration in the ileum, as well as necrosis of intestinal villi and crypts, besides severe multifocal interstitial nephritis and fibrosis in both kidneys. The invA gene was amplified from intestinal samples confirming an infection by Salmonella. The microbiologic, molecular and histopathology diagnoses suggest that death of the feline was caused by ingestion of raw chicken contaminated with Salmonella enterica serovar Albany. This clinical case highlights the importance of persistent fecal Salmonella shedding animals and describes the molecular epidemiological relationships of isolates from feces and food, which allowed to find the primary source of infection.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los serotipos de Salmonella especie enterica son los responsables del 99% de las salmonelosis en humanos y animales, en particular, Salmonella enterica serovariedad Albany se ha identificado en canales de pollo, por lo que representa un riesgo para la salud humana y animal. Se aisló Salmonella enterica serovariedad Albany a partir de heces de un ocelote macho (Leopardus pardalis), cautivo en el zoológico de Culiacán, Sinaloa, México, y de pollo crudo (alimento del felino). El patrón por electroforesis en campo pulsado (PFGE) con la enzima Xba I fue idéntico en ambos aislados, lo que indica que la fuente de infección fue el pollo crudo. Cinco meses después de haber aislado las bacterias de las heces, se realizó estudio post mortem del felino anteriormente mencionado, y se observó macroscópicamente: enterocolitis hemorrágica severa y fibrosis renal; y microscópicamente: necrosis de vellosidades y de criptas e infiltrado mononuclear linfocitario severo en íleon, además nefritis intersticial severa multifocal y fibrosis en riñón. A partir de muestras intestinales se amplificó el gen invA que confirma la infección por Salmonella. Los diagnósticos microbiológico, molecular e histopatológico sugieren que la muerte del felino se debió a la infección causada por la ingesta de pollo crudo contaminado con Salmonella enterica serovariedad Albany. Este caso clínico confirma la importancia que tienen los animales que excretan Salmonella vía fecal y describe la relación epidemiológica-molecular de los aislamientos obtenidos de heces y alimento, lo que permitió esclarecer la fuente primaria de infección.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[salmonellosis]]></kwd>
<kwd lng="en"><![CDATA[fecal excretion]]></kwd>
<kwd lng="en"><![CDATA[raw chicken]]></kwd>
<kwd lng="en"><![CDATA[ocelot]]></kwd>
<kwd lng="es"><![CDATA[salmonelosis]]></kwd>
<kwd lng="es"><![CDATA[excreción fecal]]></kwd>
<kwd lng="es"><![CDATA[pollo crudo]]></kwd>
<kwd lng="es"><![CDATA[ocelote]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Notas de Investigaci&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Excreci&oacute;n fecal de <i>Salmonella</i> Albany, su aislamiento en la raci&oacute;n alimenticia y repercusi&oacute;n en el estado de salud de un ocelote (<i>Leopardus pardalis</i>) en cautiverio</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Fecal excretion of <i>Salmonella</i> Albany, its isolation in the diet and health repercussion on an ocelot (<i>Leopardus pardalis</i>) in captivity</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Gabriela Silva&#45;Hidalgo*<sup>,&dagger;</sup> H&eacute;ctor Samuel L&oacute;pez&#45;Moreno*<sup>,</sup>** Vianney F. Ortiz&#45;Navarrete*** Felipe Ju&aacute;rez&#45;Barranco<sup>&dagger;</sup> Mart&iacute;n L&oacute;pez&#45;Valenzuela<sup>&dagger;</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>* Programa Regional del Noroeste, Facultad de Ciencias Qu&iacute;mico&#45;Biol&oacute;gicas, Universidad Aut&oacute;noma de Sinaloa, Ciudad Universitaria, 80040, Culiac&aacute;n, Sinaloa, M&eacute;xico. Tel./Fax: 01 (667) 713&#45;66&#45;15, correo electr&oacute;nico</i><a href="mailto:gaby@uas.uasnet.mx">gaby@uas.uasnet.mx</a>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>** Laboratorio de Biomedicina Molecular, Facultad de Ciencias Qu&iacute;mico&#45;Biol&oacute;gicas, Universidad Aut&oacute;noma de Sinaloa, Ciudad Universitaria, 80040, Culiac&aacute;n, Sinaloa, M&eacute;xico, Tel./Fax: 01 (667) 713&#45;66&#45;15.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>*** Departamento de Biomedicina Molecular, Centro de Investigaci&oacute;n y de Estudios Avanzados (Cinvestav), Instituto Polit&eacute;cnico Nacional, Av. Instituto Polit&eacute;cnico Nacional 2508, col. San Pedro Zacatenco, 07360, M&eacute;xico, DF. Tel.: (01) (55) 50 61 38 00, ext. 5001, Fax: 50 61 39 38.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>&dagger; Laboratorio de Patolog&iacute;a, Facultad de Medicina Veterinaria y Zootecnia, Universidad Aut&oacute;noma de Sinaloa, Boulevard San &Aacute;ngel s/n, Fracc. San Benito, 80246, Culiac&aacute;n, Sinaloa, M&eacute;xico, Tel./Fax: 01 (667) 718&#45;16&#45;50.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 26 de enero de 2011    <br> 	Aceptado el 20 de septiembre de 2011</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Salmonella enterica</i> serotypes are 99% responsible for salmonellosis in human and animals, especially <i>Salmonella enterica</i> serovar Albany that has been identified in chicken carcass representing a risk for human and animal health. <i>Salmonella enterica</i> serovar Albany was isolated from the feces of a male ocelot (<i>Leopardus pardalis</i>), at the zoo in Culiacan, Sinaloa, Mexico, and from raw chicken (feline's diet). The pulsed&#45;field gel electrophoresis pattern (PFGE) generated by X<i>ba</i> I enzyme was identical in both isolates, indicating that the source of infection was the raw chicken. Five months after having isolated the bacteria from the feces, a <i>post mortem</i> study was carried out on the feline. Macroscopically, severe hemorrhagic enterocolitis and renal fibrosis was observed and microscopically, there was evidence of severe mononuclear lymphocytic infiltration in the ileum, as well as necrosis of intestinal villi and crypts, besides severe multifocal interstitial nephritis and fibrosis in both kidneys. The <i>inv</i>A gene was amplified from intestinal samples confirming an infection by <i>Salmonella</i>. The microbiologic, molecular and histopathology diagnoses suggest that death of the feline was caused by ingestion of raw chicken contaminated with <i>Salmonella enterica</i> serovar Albany. This clinical case highlights the importance of persistent fecal <i>Salmonella</i> shedding animals and describes the molecular epidemiological relationships of isolates from feces and food, which allowed to find the primary source of infection.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> salmonellosis, fecal excretion, raw chicken, ocelot.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los serotipos de <i>Salmonella</i> especie <i>enterica</i> son los responsables del 99% de las salmonelosis en humanos y animales, en particular, <i>Salmonella enterica</i> serovariedad Albany se ha identificado en canales de pollo, por lo que representa un riesgo para la salud humana y animal. Se aisl&oacute; <i>Salmonella enterica</i> serovariedad Albany a partir de heces de un ocelote macho (<i>Leopardus</i> <i>pardalis</i>), cautivo en el zool&oacute;gico de Culiac&aacute;n, Sinaloa, M&eacute;xico, y de pollo crudo (alimento del felino). El patr&oacute;n por electroforesis en campo pulsado (PFGE) con la enzima X<i>ba</i> I fue id&eacute;ntico en ambos aislados, lo que indica que la fuente de infecci&oacute;n fue el pollo crudo. Cinco meses despu&eacute;s de haber aislado las bacterias de las heces, se realiz&oacute; estudio <i>post mortem</i> del felino anteriormente mencionado, y se observ&oacute; macrosc&oacute;picamente: enterocolitis hemorr&aacute;gica severa y fibrosis renal; y microsc&oacute;picamente: necrosis de vellosidades y de criptas e infiltrado mononuclear linfocitario severo en &iacute;leon, adem&aacute;s nefritis intersticial severa multifocal y fibrosis en ri&ntilde;&oacute;n. A partir de muestras intestinales se amplific&oacute; el gen <i>inv</i>A que confirma la infecci&oacute;n por <i>Salmonella</i>. Los diagn&oacute;sticos microbiol&oacute;gico, molecular e histopatol&oacute;gico sugieren que la muerte del felino se debi&oacute; a la infecci&oacute;n causada por la ingesta de pollo crudo contaminado con <i>Salmonella enterica</i> serovariedad Albany. Este caso cl&iacute;nico confirma la importancia que tienen los animales que excretan <i>Salmonella</i> v&iacute;a fecal y describe la relaci&oacute;n epidemiol&oacute;gica&#45;molecular de los aislamientos obtenidos de heces y alimento, lo que permiti&oacute; esclarecer la fuente primaria de infecci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> salmonelosis, excreci&oacute;n fecal, pollo crudo, ocelote.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El g&eacute;nero <i>Salmonella</i> pertenece a la familia Enterobacteriaceae, son bacilos gram negativos que no forman esporas,<sup>1</sup> y consta s&oacute;lo de dos especies, <i>Salmonella</i> <i>bongori</i> y <i>Salmonella</i> <i>enterica</i>, y de seis subspecies. A los serotipos de la especie <i>enterica</i> se les atribuyen 99% de las salmonelosis en seres humanos y animales,<sup>2</sup> y se le reconocen aproximadamente 2500 serotipos, clasificados por los az&uacute;cares que constituyen su pared bacteriana, o bien por las prote&iacute;nas de membrana o flagelares.<sup>3</sup> Algunos de los serotipos de <i>Salmonella</i> son hospedero&#45;espec&iacute;ficos, como es el caso de <i>Salmonella enterica</i> serovariedad Typhi (<i>Salmonella</i> Typhi), que &uacute;nicamente infecta al ser humano y ocasiona fiebre tifoidea. Sin embargo, algunos otros serotipos pueden infectar a muchas especies animales, incluyendo al hombre, por ejemplo <i>Salmonella enterica</i> serovariedad Typhimurium (<i>Salmonella</i> Typhimurium) que &uacute;nicamente ocasiona gastroenteritis, o <i>Salmonella</i> <i>enterica</i> serovariedad Albany (<i>Salmonella</i> Albany). La habilidad para causar enfermedad en hospederos no espec&iacute;ficos depende de la adaptaci&oacute;n bacteriana con su entorno ambiental,<sup>4</sup> gracias a ello algunos serotipos sobreviven en agua, alimentos, y cuando son ingeridos por seres humanos o animales, pueden causar trastornos gastrointestinales de evoluci&oacute;n de leve a grave, o infecciones sist&eacute;micas como es el caso de la fiebre tifoidea.<sup>5</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Poco se sabe del papel que juegan los animales silvestres en cautiverio como reservorios de <i>Salmonella</i>. Algunos autores han asociado dicho g&eacute;nero en la morbilidad y mortalidad de animales de zool&oacute;gico, la probable fuente de infecci&oacute;n para estos animales son las frutas y alimentos contaminados por roedores y peque&ntilde;as aves nativas que tienen acceso a los albergues.<sup>6</sup> Cubas encontr&oacute; que era com&uacute;n la excreci&oacute;n de <i>Salmonella</i> en heces de aves y primates de zool&oacute;gicos de Sudam&eacute;rica y que &eacute;stos no presentaban sintomatolog&iacute;a cl&iacute;nica.<sup>7</sup> Or&oacute;s <i>et al.</i><sup>8</sup><sup><i>8</i></sup> aislaron <i>Salmonella</i> <i>arizonae</i> a partir de lesiones digestivas y respiratorias en serpientes. Por lo que respecta a felinos silvestres, se ha logrado aislar <i>Salmonella</i> tanto de heces como de alimento (carne cruda); sin embargo, las serovariedades encontradas corresponden a Typhimurium, Muenchen, Uganda, Newport, entre otras, a excepci&oacute;n de la serovariedad Albany.<sup>9&#45;11</sup> Cabe mencionar que los felinos, por su condici&oacute;n carn&iacute;vora, presentan un alto riesgo de desarrollar salmonelosis. Clyde <i>et al.</i> aislaron <i>Salmonella</i> de las heces de felinos ex&oacute;ticos alimentados con carne cruda, incluso se ha logrado disminuir la excreci&oacute;n del pat&oacute;geno con la modificaci&oacute;n del tipo de dieta en estos animales.<sup>10,11</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Salmonella</i> Albany es una serovariedad raramente aislada de procesos infecciosos; sin embargo, se ha identificado en canales de pollo, por lo que representa un riesgo potencial para la salud humana y animal.<sup>12</sup> La <i>Salmonella</i><sup>13</sup> es la primordial fuente de toxicoinfecci&oacute;n alimentaria en productos c&aacute;rnicos, principalmente los de origen aviar. En pollos congelados de exportaci&oacute;n destinados para consumo humano en Tailandia<sup>14</sup> y en rastros de aves tanto en canales como en utensilios y diferentes &aacute;reas de trabajo en rastros de Brasil,<sup>15</sup> se aisl&oacute; <i>Salmonella</i> Albany, y result&oacute; ser la segunda serovariedad m&aacute;s prevalente aislada de granjas av&iacute;colas en Argelia.<sup>16</sup> Las aves para consumo humano y sus productos constituyen una proporci&oacute;n significativa de las fuentes implicadas en brotes alimentarios de <i>Salmonella</i>.<sup>17&#45;19</sup> La contaminaci&oacute;n de estos productos, es un indicador de la falta de higiene durante la etapa de procesamiento del alimento o bien en varias etapas de la cadena de distribuci&oacute;n y refrigeraci&oacute;n de la carne, lo que permite la multiplicaci&oacute;n de <i>Salmonella</i>.<sup>20</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En el presente trabajo se demuestra el aislamiento de <i>Salmonella</i> Albany a partir de heces de un ocelote y de la carne de pollo cruda que se utilizaba como alimento, lo que sugiere que la enfermedad gastroent&eacute;rica severa que padeci&oacute; el felino se debi&oacute; a la infecci&oacute;n por <i>Salmonella</i> Albany.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b><i>Descripci&oacute;n del caso</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2">Con la finalidad de identificar animales excretores de <i>Salmonella</i> durante 2008, se recolectaron heces del albergue de un ocelote macho (<i>Leopardus pardalis</i>) de 10 a&ntilde;os de edad, cautivo en el zool&oacute;gico de Culiac&aacute;n, Sinaloa, M&eacute;xico. Se tomaron dos muestras, la primera en enero y la segunda en mayo. Asimismo, tambi&eacute;n se recolectaron muestras del alimento ofrecido al ocelote, pollo crudo proveniente de una planta procesadora. En octubre del mismo a&ntilde;o, se aplic&oacute; el programa de medicina preventiva, que somete a estr&eacute;s a los animales por el manejo que se les impone, y que coincidi&oacute; con la siguiente historia cl&iacute;nica de dos semanas de evoluci&oacute;n en el ocelote: melena, anorexia, v&oacute;mito, letargia y deshidrataci&oacute;n. Durante ese tiempo se medic&oacute; al animal con sulfamonometoxina&#45;trimetoprim v&iacute;a oral<a href="#nota">*</a> e intramuscular,<a href="#nota">**</a> sospechando coccidiosis intestinal. Ese mismo mes de octubre se remiti&oacute; al felino antes referido al Laboratorio de Patolog&iacute;a de la Universidad Aut&oacute;noma de Sinaloa para estudio de necropsia, despu&eacute;s de 10 a 12 horas de muerto, lo que pudo constatarse por la p&eacute;rdida de <i>rigor mortis</i> en miembros posteriores y anteriores, y rigidez cadav&eacute;rica en cuello y cabeza.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>T&eacute;cnicas diagn&oacute;sticas utilizadas en</i> <i>muestras de heces y pollo crudo</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Aislamiento bacteriano.</i> Los medios de cultivo utilizados para aislamiento bacteriano fueron: caldo tetrationato<a href="#nota">***</a> (incubaci&oacute;n por 48 horas), medio semis&oacute;lido Rappaport Vassiliadis* (incubaci&oacute;n por 24 horas), Agar XLT<sub>4</sub><a href="#nota">****</a> (incubaci&oacute;n por 24 horas). En cada una de las t&eacute;cnicas bacteriol&oacute;gicas utilizadas durante el desarrollo de este caso cl&iacute;nico, se utiliz&oacute; como testigo la cepa de referencia <i>Salmonella</i> Typhimurium (ATCC 14028 S).</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Confirmaci&oacute;n bioqu&iacute;mica y serotipificaci&oacute;n.</i> Las colonias bacterianas aisladas se sometieron a un an&aacute;lisis bioqu&iacute;mico confirmatorio. Las pruebas bioqu&iacute;micas utilizadas fueron: caldo sorbitol, caldo mucato, medio motilidad&#45;indol&#45;ornitina (MIO), agar triple az&uacute;car&#45; hierro (TSI), agar lisina&#45;hierro (LIA), prueba de ureasa y prueba de citrato. La serotipifcaci&oacute;n se realiz&oacute; de acuerdo con el esquema de Kauffmann&#45;White.<sup>21</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Confirmaci&oacute;n del g&eacute;nero mediante reacci&oacute;n en cadena de</i> <i>la polimerasa (PCR por sus siglas en ingl&eacute;s).</i> El g&eacute;nero bacteriano se confirm&oacute; mediante PCR con la amplificaci&oacute;n del gen <i>inv</i>A.<sup>22</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Genotipificaci&oacute;n.</i> La genotipificaci&oacute;n de los aislados bacterianos se realiz&oacute; mediante la digesti&oacute;n de la enzima de restricci&oacute;n X<i>ba</i> I y electroforesis en campo pulsado (PFGE, por sus siglas en ingl&eacute;s), utilizando el sistema CHEF&#45;DR III<a href="#nota">*****</a> a 6 V/cm durante 18 h con pulsaciones cada 10&#45;30 segundos. Despu&eacute;s de la electroforesis el gel se ti&ntilde;&oacute; con bromuro de etidio y fue analizado en un fotodocumentador GelDoc<sup>TM</sup> XR.<a href="#nota">*****</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>T&eacute;cnicas diagn&oacute;sticas utilizadas</i> <i>en el estudio</i> post mortem</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Estudio de necropsia.</i> Se realiz&oacute; la necropsia de acuerdo con la t&eacute;cnica descrita por Aline <i>et al</i>.<sup>23</sup> Se tomaron muestras de intestino y ri&ntilde;&oacute;n para examen histopatol&oacute;gico. Las muestras se fijaron en formalina al 10%, amortiguada a pH de 7.2 para su procesamiento seg&uacute;n la t&eacute;cnica est&aacute;ndar; se realizaron cortes de tejido en un micr&oacute;tomo a un espesor de 2 a 4 &#956;m y se ti&ntilde;eron por la t&eacute;cnica de hematoxilina y eosina (H&amp;E).<sup>24</sup> Para cuantificar las lesiones se consideraron los siguientes grados: grado leve cuando los cambios patol&oacute;gicos en los &oacute;rganos en estudio abarcaron hasta 25%, grado moderado, de 25 a 50%, y grado severo, de 50 al 100% del &oacute;rgano afectado.<sup>25</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Identificaci&oacute;n de g&eacute;nero por PCR en tejidos incluidos en</i> <i>parafina.</i> Para la identificaci&oacute;n del g&eacute;nero bacteriano se utiliz&oacute; un corte de 14 &#956;m del tejido de cada bloque de parafina y se coloc&oacute; en un microtubo de 0.5 &micro;l para realizar la PCR con la amplificaci&oacute;n del gen <i>inv</i>A. El procedimiento de extracci&oacute;n de ADN, se llev&oacute; a cabo utilizando 150 &#956;l de una soluci&oacute;n de Chelex &reg;100 Resin<a href="#nota">******</a> al 5% y calentando a 100&deg;C por 30 minutos. Luego se centrifug&oacute; a 25,000 <i>g</i> por 10 min y se transfiri&oacute; el sobrenadante a un microtubo de 0.5 &micro;l est&eacute;ril.<sup>26</sup></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En el an&aacute;lisis de heces y pollo crudo, el tren de aislamiento bacteriano y amplificaci&oacute;n del gen <i>inv</i>A revel&oacute; la presencia de <i>Salmonella</i> spp. En lo referente al aislamiento se observaron en el agar XLT<sub>4</sub>, medio de cultivo selectivo y diferencial para identificaci&oacute;n de microorganismos del g&eacute;nero <i>Salmonella</i>, colonias de tonalidad negra (H<sub>2</sub>S positivas), confirm&aacute;ndose el g&eacute;nero por medio de las pruebas bioqu&iacute;micas (sorbitol&#45;positivo, mucato&#45;positivo, MIO&#45; (+, &#45;, +), TSI&#45; K/A, LIA&#45;K/K, ureasa&#45;negativa y citrato&#45;positivo). Por lo que respecta a la amplificaci&oacute;n del gen <i>inv</i>A, el an&aacute;lisis electrofor&eacute;tico mostr&oacute; un producto amplificado de 283 pb correspondiente al tama&ntilde;o esperado para estos iniciadores. Se determin&oacute; la serovariedad de la cepa clasific&aacute;ndola como <i>Salmonella enterica</i> serovariedad Albany. Ambas cepas presentaron el mismo patr&oacute;n electrofor&eacute;tico despu&eacute;s de la digesti&oacute;n con la enzima de restricci&oacute;n X<i>ba</i> I y con la t&eacute;cnica de PFGE (<a href="#f1">Figura 1</a>)<i>.</i></font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/vetmex/v43n1/a6f1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">Los hallazgos en los estudios <i>post mortem</i> se detallan a continuaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>Estudio de necropsia e histopatol&oacute;gico</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Hallazgos macrosc&oacute;picos.</i> A la inspecci&oacute;n externa, el cad&aacute;ver present&oacute; una pobre condici&oacute;n de masa muscular, deshidrataci&oacute;n severa y presencia de excremento en regi&oacute;n crural; a la inspecci&oacute;n interna, se observ&oacute; en &iacute;leon y colon la presencia de un exudado hemorr&aacute;gico (enterocolitis hemorr&aacute;gica severa) (<a href="#f2">Figura 2</a>) y fibroplasia difusa en ambos ri&ntilde;ones (fibrosis renal severa) (<a href="#f3">Figura 3</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/vetmex/v43n1/a6f2.jpg"></font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f3"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/vetmex/v43n1/a6f3.jpg"></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>Hallazgos microsc&oacute;picos.</i> Los principales hallazgos fueron: en &iacute;leon, necrosis de vellosidades y de criptas as&iacute; como un infiltrado mononuclear linfocitario severo (<a href="#f4">Figuras 4</a> y <a href="#f5">5</a>), y en ri&ntilde;&oacute;n, nefritis intersticial severa multifocal, fibrosis, congesti&oacute;n y hemorragia (<a href="#f6">Figuras 6</a> y <a href="#f7">7</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/vetmex/v43n1/a6f4.jpg"></font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f5"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/vetmex/v43n1/a6f5.jpg"></font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f6"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/vetmex/v43n1/a6f6.jpg"></font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f7"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/vetmex/v43n1/a6f7.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>PCR de tejidos incluidos en parafina.</i> El ADN extra&iacute;do de &iacute;leon amplific&oacute; el gen <i>inv</i>A, mostrando en el an&aacute;lisis electrofor&eacute;tico un producto amplificado de 283 pb correspondiente al tama&ntilde;o esperado para estos iniciadores. En el caso del ri&ntilde;&oacute;n no se logr&oacute; la amplificaci&oacute;n.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La sintomatolog&iacute;a digestiva y las lesiones intestinales macro y microsc&oacute;picas, identificadas en diferentes investigaciones de patolog&iacute;a experimental, indican una infecci&oacute;n sist&eacute;mica por <i>Salmonella.</i><sup>27</sup> En el presente estudio, los hallazgos diagn&oacute;sticos, microbiol&oacute;gico y molecular en heces, pollo crudo e &iacute;leon, demostraron que se trat&oacute; de <i>Salmonella enterica</i> serovariedad Albany. Es probable que el felino se haya recuperado de un episodio intestinal agudo anterior, con cierto grado de infecci&oacute;n sist&eacute;mica que permiti&oacute; a la bacteria alcanzar linfonodos mesent&eacute;ricos, ri&ntilde;&oacute;n y ves&iacute;cula biliar, convirti&eacute;ndose as&iacute; en portador, hecho que se corrobora por los aislamientos positivos realizados antes de la muerte del ocelote.<sup>26</sup> Aunque no se tuvo evidencia molecular de presencia de <i>Salmonella</i> en ri&ntilde;&oacute;n, la lesi&oacute;n renal macro y microsc&oacute;pica es compatible con dicho agente pat&oacute;geno, probablemente de evoluci&oacute;n cr&oacute;nica,<sup>27</sup> pues se sabe que los lipopolisac&aacute;ridos (LPS) que forman parte de la membrana externa bacteriana que inducen a la muerte de c&eacute;lulas tubulares, producen lesiones que se reparan a trav&eacute;s de fibroplasia.<sup>28</sup> De igual manera, cabe mencionar que el ejemplar durante el desarrollo del cuadro cl&iacute;nico, tuvo factores de riesgo asociados con la infecci&oacute;n por <i>Salmonella,</i> como son la edad, &eacute;poca del a&ntilde;o y el estr&eacute;s.<sup>29</sup> Los animales sometidos a estr&eacute;s, ya sea por transporte, manejo o bien por confinamiento, como en este caso, tienen mayor probabilidad de excretar enteropat&oacute;genos como <i>Salmonella</i> v&iacute;a fecal,<sup>30</sup> y este hecho aumenta el riesgo de infecci&oacute;n en otros animales del mismo albergue, o bien, de albergues contiguos.<sup>31</sup> En este caso, no fue posible aislar la enterobacteria <i>Salmonella</i> de los linfonodos mesent&eacute;ricos del ocelote; sin embargo, otros investigadores lo han logrado a partir de &eacute;stos &oacute;rganos linfoides de marsupiales en cautiverio.<sup>32</sup> Por lo que respecta al orden Carn&iacute;vora, otras investigaciones han encontrado este orden como el de mayor prevalencia en excreci&oacute;n de <i>Salmonella</i> e incluso, dentro del mismo, el ocelote ha sido la especie que ha presentado la prevalencia m&aacute;s alta.<sup>6</sup> Muchas investigaciones asocian la alimentaci&oacute;n animal basada en carne cruda, con la excreci&oacute;n fecal de <i>Salmonella</i>, con prevalencias de excreci&oacute;n que var&iacute;an entre 1 y 69%.<sup>33</sup> El inicio y la duraci&oacute;n de excreci&oacute;n fecal est&aacute;n relacionados con la dosis infectante, tipo de exposici&oacute;n, serovariedad y factores del hospedero, adem&aacute;s, la serovariedad de <i>Salmonella</i> presente en el excremento, podr&iacute;a coincidir con la serovariedad consumida en cualquier momento de la semana anterior a la excreci&oacute;n, o bien, con la que se encuentra en el alimento reci&eacute;n consumido.<sup>34</sup> El tipo de dieta influye por lo tanto, en los hallazgos de aislamientos positivos encontrados en este caso y se asocia al consumo de carne cruda contaminada con la bacteria.<sup>11,35</sup> Aunque <i>Salmonella</i> es un enteropat&oacute;geno involucrado principalmente en infecciones de tipo alimentario, hay que considerar tambi&eacute;n otras fuentes importantes de exposici&oacute;n a estos microorganismos, como el agua, el polvo, el contacto directo con roedores o insectos del entorno.<sup>36&#45;39</sup> Es factible tambi&eacute;n que la bacteria pueda diseminarse entre los albergues, a trav&eacute;s de las botas, ropa, o implementos de limpieza utilizados por los trabajadores por lo que ser&aacute; necesario considerar estos factores, para lograr minimizar la posibilidad de dispersar el agente bacteriano, no s&oacute;lo en el zool&oacute;gico sino en cualquier ambiente.<sup>40</sup> Los patrones electrofor&eacute;ticos observados en la PFGE, tanto de la cepa aislada de las heces del ocelote como de la aislada del alimento fueron id&eacute;nticos, lo que sugiere que la fuente de infecci&oacute;n es el pollo crudo. Actualmente, diversas investigaciones han encontrado <i>Salmonella</i> Albany aislada de pollos en un alto porcentaje (50%)<sup>41</sup> y es uno de los productos animales m&aacute;s asociado con cuadros de enteritis, septicemia y aborto en animales, y de gastroenteritis y fiebre tifoidea en el ser humano.<sup>42</sup> En este caso, dado que se logr&oacute; identificar la fuente primaria de infecci&oacute;n, es posible implementar medidas estrat&eacute;gicas de prevenci&oacute;n de la infecci&oacute;n en las dem&aacute;s especies carn&iacute;voras, ya que la excreci&oacute;n de <i>Salmonella</i> no t&iacute;fica en este centro recreativo puede tener repercusiones cl&iacute;nicas y de suma importancia en la salud p&uacute;blica, por tratarse de un agente pat&oacute;geno de &iacute;ndole zoon&oacute;tico,<sup>43</sup> as&iacute; como en las otras especies animales en cautiverio albergadas en el zool&oacute;gico, que pueden comportarse como reservorios de la bacteria y portador cr&oacute;nico.<sup>44</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Este caso cl&iacute;nico destaca la importancia de la contaminaci&oacute;n del ambiente donde se alojan animales que excretan <i>Salmonella</i> en heces, y m&aacute;s a&uacute;n, cuando estos ejemplares pertenecen a colecciones exhibidas en zool&oacute;gicos, como en este caso, lo que puede tener serias implicaciones en la salud p&uacute;blica, sobre todo en ni&ntilde;os menores de 5 a&ntilde;os, ancianos, mujeres embarazadas y otros individuos inmunocomprometidos que acudan a estos centros recreativos.<sup>45,46</sup> La relevancia de la epidemiolog&iacute;a de la salmonelosis en los animales silvestres portadores sanos ha sido informada por Hudson <i>et al.</i><sup>47</sup> en Estados Unidos de Am&eacute;rica y por Refsum <i>et</i> <i>al.</i><sup>48</sup> en Noruega. La excreci&oacute;n intestinal de <i>Salmonella</i> por animales infectados, incluyendo aquellos que no muestran sintomatolog&iacute;a cl&iacute;nica, representa un gran reto para establecer programas de sanidad ambiental, ya que a pesar de tratar con antibi&oacute;ticos a todos los animales infectados, las bacterias pueden ser excretadas constantemente en las heces y seguir contaminando el ambiente, a otros animales susceptibles, o bien, el agua que constituye un medio altamente favorable para la diseminaci&oacute;n y multiplicaci&oacute;n de las bacterias en general.<sup>49</sup> Siendo el alimento una de las fuentes de infecci&oacute;n primaria involucrada en salmonelosis gastroent&eacute;rica identificada por varios autores, el ofrecido a los carn&iacute;voros cautivos, deber&iacute;a ser sujeto a la misma inspecci&oacute;n rigurosa a que son sometidos los alimentos para consumo humano, lo cual reducir&iacute;a el riesgo de contaminaci&oacute;n y transmisi&oacute;n de la enfermedad.<sup>50</sup> Otra alternativa de prevenci&oacute;n, adem&aacute;s de la antibioterapia y la inspecci&oacute;n sanitaria del alimento, es la estimulaci&oacute;n de la respuesta inmune a trav&eacute;s de la inclusi&oacute;n en la raci&oacute;n alimenticia de compuestos probi&oacute;ticos, los cuales favorecen el rechazo de microorganismos infecciosos potencialmente lesivos, esto lo pueden realizar mediante la producci&oacute;n de inmunoglobulinas espec&iacute;ficas tipo A, modulando la maduraci&oacute;n de c&eacute;lulas dendr&iacute;ticas, o bien, mediante la activaci&oacute;n de c&eacute;lulas NK.<sup>51,52</sup> En cuanto a la infraestructura propia del zool&oacute;gico, las limitantes que favorecen el riesgo de infecci&oacute;n son entre otras: instalaciones inadecuadas destinadas para el lavado de manos, flujo inadecuado de visitantes, zonas destinadas a la preparaci&oacute;n y consumo de alimentos para consumo humano cercanas a las &aacute;reas de exhibici&oacute;n de animales y aguas residuales mal manejadas.<sup>53</sup> Ser&aacute; necesario conducir investigaciones epidemiol&oacute;gicas que sigan protocolos apropiados para el muestreo de seres humanos, animales y medio ambiente, incluyendo la subtipificaci&oacute;n molecular de los pat&oacute;genos aislados, adem&aacute;s de que los laboratorios de salud p&uacute;blica estatales y nacionales informen sobre los brotes de infecciones ent&eacute;ricas asociadas con contacto animal.</font></p>  	    <p align="justify"><font face="verdana" size="2">De este trabajo se concluye que <i>Salmonella</i> Albany pudo ser aislada de heces y alimento, como fuente primaria de infecci&oacute;n, y demuestra la importancia de la subtipificaci&oacute;n por PFGE. Este comunicado describe la relaci&oacute;n epidemiol&oacute;gica&#45;molecular de los aislamientos obtenidos del parque zool&oacute;gico. El peligro potencial de transmisi&oacute;n de salmonelosis no t&iacute;fica entre los visitantes o bien entre los trabajadores de este centro recreativo no debe ser subestimado, por ello, es urgente implementar sistemas de vigilancia de enfermedades en animales y personas, ya que se desconoce si las afecciones de tipo diarreico que se presentan en los seres humanos tienen correspondencia gen&oacute;mica con las serovariedades responsables de los trastornos en animales. Ser&aacute; necesario continuar con estudios m&aacute;s amplios para estar en posibilidades de esclarecer el comportamiento bacteriano de esta serovariedad y prevenir brotes potenciales en la poblaci&oacute;n humana de Sinaloa.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. POPOFF MY, BOCKEMUHL J, GHEESLING LL. Supplement 2001 no. 45 to the Kauffmann&#45;White scheme. Res Microbiol 2003; 154: 173&#45;174.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=10160763&pid=S0301-5092201200010000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. 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