[[Image:Kinetics of FeLV 2.jpg|thumb|right|200px|Kinetics of FeLV - Copyright Dr Brian Catchpole BVetMed PhD MRCVS]]
[[Image:Kinetics of FeLV 2.jpg|thumb|right|200px|Kinetics of FeLV - Copyright Dr Brian Catchpole BVetMed PhD MRCVS]]
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FeLV is an ncogenic retrovirus which causes neoplasia (lymphoma), myelosuppression (anaemia) and immunosuppression (of [[Lymphocytes#T cells|T cells]]). Three different strains are currently recognised:
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FeLV is an ncogenic retrovirus which causes neoplasia (lymphoma), myelosuppression ([[Regenerative and Non-Regenerative Anaemias|anaemia]]) and immunosuppression (of [[Lymphocytes#T cells|T cells]]). Three different strains are currently recognised:
*FeLV-A -natural strain
*FeLV-A -natural strain
*FeLV-B which formed through FeLV-A recombining with endogenous retroviral sequences in the feline genome.
*FeLV-B which formed through FeLV-A recombining with endogenous retroviral sequences in the feline genome.