Prrs Hecha Por Ale
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Sndrome ReproductivoRespiratorio Porcino
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El sndrome respiratorio y reproductivoporcino (PRRS), es una enfermedadinfecciosa de origen vrico, que emergepor vez en 1989, estando en la actualidadconsiderada como uno de los problemasms importantes del sector porcino
mundial.
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SINONIMIAS:
Plaga porcina del 89
Porcine Epidemic Abortion and
Respiratory Sindrome (PEARS)
Aborto Azul
Enfermedad Misteriosa del Cerdo
Enfermedad de las orejas azules
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Virus de PRRS
FamiliaArteroviridae
GneroArtevirus
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EU, Pases de Europa comoAlemania, Holanda, ReinoUnido, Blgica, Espaa,
Dinamarca, Norte Amricaincluido Mxico, Asia
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El principal mecanismo de transmisin de PRRS es el contactodirecto con un cerdo infectado.
La entrada de nuevos reproductores o el traslado de animales
son las causas ms importantes de nuevos focos.
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Patogenia del virus dePRRS
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Patogenia del virus dePRRS
El virus entra por mucosas, se multiplica en macrfagoslocales, tambin puede multiplicarse en Neumocitos tipo II,despus llega a sangre, en donde produce un cuadro deviremia por alrededor de 6 u 8 semanas mientras se monta la
respuesta inmune.
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Por sangre el virus se distribuye a diversos rganosproduciendo:Neumona intersticialVasculitisMiocarditisEncefalitisRinitis
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En cerdas gestantes atraviesa barrera placentariaprovocando abortos en el ltimo tercio de la gestacin,momificaciones, el nacimiento de lechones dbiles
muertos.En los machos afecta cantidad y calidad de semen.
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3 formas de presentacin de la
enfermedad PRRS:
1.- Forma epidmica o reproductiva2.- Forma endmica, respiratoria
crnica3.- Forma subclnica
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Forma epidmica, reproductiva agudaEn granjas libres de PRRS se puede infectar el 100% de lascerdas y sufrir una viremia de alrededor de 3 semanas de
duracin.
Si la hembra est en el ltimo tercio de gestacin el virus alatravesar la barrera placentaria y produce nacimiento de fetosmomificados, lechones muertos dbiles junto con animalesnormales y aborto.
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Forma endmica, respiratoria crnica
Aparece cuando la granja se he recuperado de la forma aguda,
los lechones sufren un periodo de viremia de alrededor de 6 a 8semanas, excretan durante largo tiempo el virus, infectando alos lechones o cerdos que ingresan a las diferentes reas deproduccin.
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Es frecuente observar signos respiratorios, edema en prpados,y aumento en todos los ganglios linfticos, neumonaanteroventral.
En histopatologa se observa neumona intersticial con infiltradode mononucleares y engrosamiento de los espaciosinteralveolares, sin necrosis bronquiolar ( a diferencia deInfluenza Porcina que s tiene necrosis alveolar).
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Los cerdos sufren infecciones bacterianas secundarias queagravan el cuadro neumnico, complicando diagnsticoclnico y morfolgico.
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Forma subclnica
Son granjas que presentan serologa positiva a PRRS, sin
haberse detectado ninguna de las formas anteriores. Puederelacionarse con la infeccin de cepas de muy bajapatogenicidad de tal forma que el cuadro pasa completamentedesapercibido.
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PI muy variable, desde 5 -37 das
Curso 6-8 semanas
Morbilidad ?
Mortalidad ?
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Con frecuencia durante los episodios de PRRS se
presentan infecciones secundarias asociadas,como las producidas por Haemophilus parasuis,Streptococcus suis, Salmonella cholerasuis,Pasteurella multicida yActinobacillus
pleuropneumoniae y el Virus de laEncefalomiocarditis, Aujeszky, CoronavirusRespiratorio, Paramixovirus, etc.
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Introduccin de Cerdos sin control previo
Falta de Cuarentenas
Proximidad a granjas infectadas Tamao (+ de 500 cerdas)
Programa de Bioseguridad inadecuados
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Algunas especies aviares, los patos en particular, son susceptibles a lainfeccin por el virus de PRRS eliminando virus durante semanas enheces, y pone de manifiesto la necesidad de evaluar la susceptibilidadde otras especies aviares que frecuentan las explotaciones, comoposibles vas de transmisin del virus.
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Serologa
ELISA (ms usada)
Inmunofluorescencia
InmunoperoxidasaSuero Neutralizacin
PCR (Reaccin en Cadena de la Polimerasa)
Aislamiento Viral
Macrfagos Alveolares Porcinos
Lnea Celular Generando efecto citopatico
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Suero
Lavados bronquioalveolares
Pulmn
Semen
Tejidos Fetales
Orina y heces
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Ingelvac PRRS MLV(vacuna vivaatenuada)
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Cyblue
PYRSVAC-183 (En engorda, pero no enreproductores)
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Respetar los periodos de cuarentena, restringiendo el accesode visitantes en la granja, imponiendo un cambio obligatorio
de ropa a la entrada de las instalaciones y evitando laentrada de vehculos dentro del permetro de las misma.
La limpieza de los locales y el uso de desinfectantes es unamedida necesaria.
Se deben separar los cerdos que presenten signos respiratorios a
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Se deben separar los cerdos que presenten signos respiratorios, alugares donde no haya corrientes de aire, evitar que se mezclen conotros animales y se debe evitar la superpoblacin para evitar el estrs.
Asegurar que los lechones ingieran el calostro en el momento del
nacimiento y a las 4 horas, adems de darles electrolitos, glucosa ycalostro natural y artificial.
Como medida para reducir el estrs en los lechones recin
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Como medida para reducir el estrs en los lechones recinnacidos se ha propuesto evitar el corte de los colmillos,especialmente en los lechones nacidos dbiles, y retrasar lainyeccin de hierro hasta los 3 das de edad y el corte de cola
hasta los 5 das En los verracos, para mitigar los problemas de infertilidad, se
debe recurrir a la inseminacin artificial o al menos utilizardistintos verracos en cada monta para reducir el riesgo derepeticiones
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No existe un tratamiento especifico para laenfermedad y lo nico que se puede hacer esaplicar medidas profilcticas.
Se recomienda aadir tetraciclina al piensode gestacin durante 4 semanas,furazolidona al pienso de lactacin e inyectara los lechones con antibiticos de larga
duracin a los 3, 6 y 9 das de edad; adems,dar tetraciclinas, sulfonamidas o tilosinadurante 3 4 semanas a los cerdos encrecimiento.
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