<?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>0026-1742</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina (México)]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Med. (Méx.)]]></abbrev-journal-title>
<issn>0026-1742</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0026-17422018000300017</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[¿Es la patogenia del virus sincitial respiratorio humano un factor de riesgo para el desarrollo de asma infantil?]]></article-title>
<article-title xml:lang="en"><![CDATA[Is the pathogenesis of the human respiratory syncytial virus a risk factor for the development of childhood asthma?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Cervantes]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tirado Mendoza]]></surname>
<given-names><![CDATA[Rocío]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ambrosio]]></surname>
<given-names><![CDATA[Javier R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Departamento de Microbiología y Parasitología]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Departamento de Microbiología y Parasitología]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Departamento de Microbiología y Parasitología]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>61</volume>
<numero>3</numero>
<fpage>17</fpage>
<lpage>30</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422018000300017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422018000300017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422018000300017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El virus sincitial respiratorio humano (VSRh) es considerado como el principal agente causal de infecciones del tracto respiratorio en niños. Su presentación clínica varía en cuanto a la gravedad: desde infecciones no complicadas de la vía aérea superior en adultos y niños sanos, hasta bronquiolitis y bronconeumonía en niños con factores de riesgo y menores de 2 años. Perteneciente a la familia Pneumoviridae y al género Orthopneumovirus, el VSRh es un virus envuelto que contiene un genoma de ácido ribonucleico (RNA) monocatenario de polaridad negativa, que codifica para 7 proteínas estructurales (G, F, SH, M, P, N y L) y 4 no estructurales (NS1, NS2, M1, M2). La presencia del virus se ha considerado como factor de riesgo para el desarrollo de asma infantil, que es una enfermedad inflamatoria de la vía aérea caracterizada por episodios recurrentes de obstrucción de la vía aérea inferior ante estímulos ambientales generalmente inocuos. El riesgo de desarrollar asma aumenta si la primoinfección sucede a edad temprana y si hay factores de riesgo como prematuridad y broncodisplasia pulmonar. En México, debido a la morbilidad y mortalidad asociada al VSRh, y como profilaxis en pacientes de alto riesgo; desde el año 2008, se recomienda el uso del biofármaco Pavilizumab. El objetivo de la presente revisión es describir los factores asociados a la patogénesis VSRh que podrían estar implicados en el desarrollo del asma infantil y, con ello, plantear que población está en riesgo. Para estos fines, se presenta un breve análisis de la biología del virus, la respuesta inmune que se induce durante la infección, así como aquellos fármacos aprobados en México para el tratamiento y profilaxis de infecciones asociadas al VRSh.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The human respiratory syncytial virus (hRSV) is the main pathogen of respiratory tract infections in children. The severity of the infection is depending of its clinical presentation that is moving from uncomplicated upper airway infections, in healthy adults and children, to bronchiolitis and bronchopneumonia that could be developed, in presence of risk factors, in children younger than 2 years. The virus belongs to the Pneumoviridae family and Orthopneumovirus genus, it is an enveloped virus with a single-stranded RNA genome of negative polarity that is codifying 7 structural proteins (G, F, SH, M, P, N and L) and four non-structural proteins (NS1, NS2, M1, M2). The viral infection has been considered as a risk factor for the development of childhood asthma, which is the most common airway inflammatory disease in children and characterized, by recurrent episodes of lower airway obstruction, by harmless environmental stimuli. The risk increases if primary infection occurs at an early age and in risk factors as prematurity and pulmonary broncho-dysplasia. Due to the morbidity and mortality associated with hRSV, since 2008 it has been approved the use of biopharmaceuticals as Palivizumab for prophylaxis in high-risk patients. In the present review, the aim is to present those factors that could be involved in the development of childhood asthma and their possible link to the presence of hRSV. In addition, it is an intention for presenting the possible facts of the risks in the potentially infected population. For a better comprehension of the virus, it is presented a briefly analysis of the viral structure, the induced immune response against the viral infection and those drugs that are approved in Mexico for the treatment and prophylaxis against hRSV.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Virus sincitial respiratorio]]></kwd>
<kwd lng="es"><![CDATA[enfermedades virales]]></kwd>
<kwd lng="es"><![CDATA[bronquiolitis]]></kwd>
<kwd lng="es"><![CDATA[hiperreactividad bronquial]]></kwd>
<kwd lng="es"><![CDATA[asma]]></kwd>
<kwd lng="en"><![CDATA[Respiratory syncytial virus]]></kwd>
<kwd lng="en"><![CDATA[virus diseases]]></kwd>
<kwd lng="en"><![CDATA[bronchiolitis]]></kwd>
<kwd lng="en"><![CDATA[bronchial hyperreactivity]]></kwd>
<kwd lng="en"><![CDATA[asthma]]></kwd>
</kwd-group>
</article-meta>
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