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W. H. Kirsten, E. Stefanski, S. Panem, Brief Communication: An Attenuated Mouse Leukemia Virus. I. Origin and Immunization, JNCI: Journal of the National Cancer Institute, Volume 52, Issue 3, March 1974, Pages 983–985, https://doi.org/10.1093/jnci/52.3.983
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Summary
An attenuated Kirsten murine leukemia virus was isolated from the culture fluids of a chronically infected C3Hf/Gs mouse embryo cell line. The attenuated virus failed to induce erythroblastosis or lymphomas in mice after 16–18 months. Inoculation of 3-week-old C3Hf/Gs mice with attenuated leukemia virus prevented induction of erythroblastosis or lymphomas by virulent virus given 1 month later. A similar protective effect was observed when 3-week-old Wistar/Furth rats were inoculated with attenuated virus and challenged 1 month later with a lethal dose of rat-adapted leukemia virus.