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Medical Definition of Feline leukaemia virus
1. A retrovirus of the Oncornovirinae subfamily causing many proliferative (neoplastic) and degenerative (blastopenic) diseases in domestic cats, including lymphosarcoma, thymic atrophy, immune complex glomerulonephritis, foetal abortions and resorptions, and several myeloproliferative and myelodegenerative conditions; it also causes immunosuppression in infected cats. (05 Mar 2000)