title: Isolation of a variant endogenous avian leukosis virus: non-productive exogenous infection with endogenous viruses containing p27 and p27(0).
abstract: Ten replication-competent endogenous avian leukosis viruses (ALVs) with subgroup E specificity were isolated from six commercial chicken lines of mixed breed. All the ALVs isolated belonged to a variant class of endogenous viruses with a major group-specific antigen, p27, identical in size to that of exogenous viruses and different from the p27 degrees of endogenous viruses isolated from White Leghorn chickens. It was possible to infect chickens exogenously with endogenous viruses (containing p27) and with Rous-associated virus type 0 (containing p27 degrees) but infection was non-productive. Congenital transmission and shedding did not occur in chickens infected with endogenous viruses containing p27 degrees or in chickens infected with endogenous viruses containing p27. Restriction of endogenous virus replication in some tissues (heart, spleen and meconia) of viraemic chickens was observed suggesting that exogenous infection of chickens with endogenous viruses differs from an infection with exogenous ALVs.
authors.affiliation: CSIRO Division of Animal Health, Animal Health Research Laboratory, Parkville, Victoria, Australia.
authors.forename: J
authors.initials: J
authors.lastname: Ignjatovic
mesh_terms: D000818:Animals; D001354:Avian Leukosis Virus / Q000235:genetics / Q000302:isolation & purification* / Q000472:pathogenicity; D002645:Chickens / Q000382:microbiology*; D014764:Viral Proteins / Q000502:physiology; D014766:Viremia / Q000209:etiology / Q000635:transmission; D014774:Virulence; D014779:Virus Replication
chemical_list: D014764:Viral Proteins