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:'''Type of lymphocyte''' - [[T cells|T-cell]], [[B cells|B-cel]] or [[Natural Killer cells|NK-cell]]
 
:'''Type of lymphocyte''' - [[T cells|T-cell]], [[B cells|B-cel]] or [[Natural Killer cells|NK-cell]]
 
:'''Time scale''' - Acute or Chronic
 
:'''Time scale''' - Acute or Chronic
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'''Prevalence'''
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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.
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* FeLV is an important cause of lymphoma in the cat.
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** 70% of cats with lymphoma will test positive for FeLV.
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** FeLV also causes a number of non-neoplastic diseases.
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*** Anaemia.
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*** Leukopaenia.
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*** Thymic atrophy. 
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* Cattle suffer both lymphosarcoma and leukosis in a variety of cytological forms.
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** Bovine lymphoma is caused by [[Bovine Leukaemia Virus]] (BLV).
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*** A retrovirus.
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*** There is a juvenile form of bovine lymphoma seen in young cattle which is not associated with BLV.
    
===Dog===
 
===Dog===
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Lymphoma is one of the prevalent neoplasms in the dog. 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.
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In the dog, '''multicentric''' lymphoma is most common representing 80% of cases. Alimentary, cutaneous, mediastinal and extranodal sites are less common. Additionally the majority of lymphoma cases in dogs are of the B-cell immunophenotype.  
 
In the dog, '''multicentric''' lymphoma is most common representing 80% of cases. Alimentary, cutaneous, mediastinal and extranodal sites are less common. Additionally the majority of lymphoma cases in dogs are of the B-cell immunophenotype.  
  
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