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→Prevalence
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−=====Prevalence=====
−* Order of prevalence in UK: cats, dogs, cattle, pigs and sheep.
−** In the cat and ox, viral agents have been identified as the causal agents.
−* Lymphoma is one of the prevalent neoplasms in the dog.
−** 80% of cases affect the 5 to 11 year old age group.
−** The incidence is about 28 per 100,000 dogs.
−** Blood of affected dogs shows neither a relative nor absolute increase in the number of lymphocytes until the late stages of the disease.
−*** When this stage is reached, poorly differentiated cells may appear in the blood.
−* FeLV is an important cause of lymphoma in the cat.
−** 70% of cats with lymphoma will test positive for FeLV.
−** FeLV also causes a number of non-neoplastic diseases.
−*** Anaemia.
−*** Leukopaenia.
−*** Thymic atrophy.
−* Cattle suffer both lymphosarcoma and leukosis in a variety of cytological forms.
−** Bovine lymphoma is caused by [[Bovine Leukaemia Virus]] (BLV).
−*** A retrovirus.
−*** There is a juvenile form of bovine lymphoma seen in young cattle which is not associated with BLV.
=====Species Differences=====
=====Species Differences=====