It is a common non-traumatic fatal disease of cats, a malignant neoplastic infection caused by feline leukaemia virus and feline sarcoma virus. The main features are malignant lymphoid tumours, myeloid leukaemia as well as degenerative thymic atrophy and non-regenerative anaemia. The most serious of these in cats is malignant lymphoma. Susceptibility is high in kittens and decreases with age.
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