| epidemiology of reticuloendotheliosis virus in broiler breeder flocks. | 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 isolat ... | 1985 | 3008697 |