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. 1984 Jul;51(1):123–130. doi: 10.1128/jvi.51.1.123-130.1984

Avian leukosis virus infection: analysis of viremia and DNA integration in susceptible and resistant chicken lines.

T W Baba, E H Humphries
PMCID: PMC254409  PMID: 6328031

Abstract

Avian leukosis viruses induce lymphoid leukosis, a lymphoma which develops within the bursa of Fabricius several months after virus infection. Chickens from the Hyline SC and FP lines are, respectively, susceptible and resistant to avian leukosis virus-induced lymphoid leukosis. We examined plasma and cellular DNA obtained from avian leukosis virus-infected chickens for the presence of viremia and integrated viral sequences to determine whether the extent of virus infection is comparable in individuals of both lines. A less than twofold difference in the frequency of viremia was detected between chickens of the two different lines. Although the analysis of plasma samples, which were obtained at different times postinfection, demonstrated that the duration of viremia was comparable in both susceptible and resistant chickens, the onset of the viremia observed in susceptible chickens generally preceded by 1 week that observed in resistant chickens. Moreover, integrated viral sequences were detected in approximately 90% of the SC and 40% of the FP chickens. The appearance of infectious virus in the plasma was, in general, associated with the presence of integrated viral sequences in both the bursal cells and the erythrocytes obtained from the same chicken. The presence of both the viremia and the integrated viral DNA sequences was transient, suggesting a mechanism for the elimination of virus-infected cells in both susceptible and resistant chickens. Furthermore, at 5 weeks postinfection no integrated exogenous viral sequences were detected in splenic lymphocytes obtained from either chicken line, regardless of whether these chickens were viremic or had integrated viral sequences detectable in other tissues. Our results indicate that extensive avian leukosis virus replication occurs in approximately 50% of the FP and 100% of the SC chickens. Although it appears that the viral infection spreads more quickly in the SC chickens, our results afford no obvious explanation of the resistance to the development of lymphoma exhibited by FP chickens.

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Selected References

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