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Epidemiology of Reticuloendotheliosis Virus in Broiler Breeder Flocks

R. L. Witter and D. C. Johnson
Avian Diseases
Vol. 29, No. 4 (Oct. - Dec., 1985), pp. 1140-1154
DOI: 10.2307/1590468
Stable URL: http://www.jstor.org/stable/1590468
Page Count: 15
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Epidemiology of Reticuloendotheliosis Virus in Broiler Breeder Flocks
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Abstract

Six broiler breeder flocks from two companies in Mississippi were tested at intervals for reticuloendotheliosis (RE) virus infection. Virus was isolated and antibody demonstrated in all six flocks. Infection was first detected at ages ranging from 13 to 47 weeks. Studies showed that neither congenital transmission from grandparent flocks nor treatment with contaminated vaccines was a likely source of infection; thus, exposure to RE virus was assumed to come from the environment. Virus was isolated from litter samples from two of the flocks, but no specific environmental infection source was identified. Infection rates of flocks differed between the two companies. Although adequate controls were lacking, no performance problems due to RE virus infection were apparent in breeder or broiler progeny flocks. However, the RE viruses isolated from these flocks were immunosuppressive and oncogenic when inoculated into day-old chicks. A moderate (3-16%) incidence of neoplasms was induced by contact exposure to these field isolates in the laboratory. /// Seis lotes de reproductoras pesadas pertenecientes a dos empresas en el estado de Mississippi fueron estudiados a intervalos para la infección con el virus de la reticuloendoteliosis. Se aisló el virus y se demostró la presencia de anticuerpos en todos los 6 lotes. La infección fué detectada primero a edades que variaron desde la semana 13 a la 47. Los estudios demostraron que la fuente de infección probablemente no fué ni la transmisión congénita de los lotes de abuelos, ni el tratamiento con vacunas contaminadas, por lo tanto, se asumió que la exposición de las aves al virus provino del medio ambiente. Se aisló virus de las muestras de cama en 2 lotes pero no se pudo identificar una fuente de infección específica medio ambiental. Los promedios de infección en los lotes fueron diferentes para las 2 empresas. No se identificaron problemas de rendimiento debido a la infección con el virus ni en pollos ni en los reproductores. Sin embargo, el virus aislado de estos lotes fué inmunosupresor y oncogénico cuando se inoculó en pollitos de un día de edad. En el laboratorio se indujo una incidencia moderada (3-16%) de neoplasmas mediante la exposición por contacto con estas cepas de campo.

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