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== Introduction  ==

== Introduction  ==

== Diagnosis  ==

== Diagnosis  ==

History, signalment and clinical signs are indicative of the disease, but differentials such as [[Mareks Diesease|Marek's disease]] and coligranuloma need to be excluded.  

History, signalment and clinical signs are indicative of the disease, but differentials such as [[Mareks Disease|Marek's disease]] and coligranuloma need to be excluded.  

Necropsy can be carried out and lesions seen will include focal grey to white tumours, initially in the bursa, then liver, spleen, kidney etc. The liver may be very large. Microscopic examination will reveal lymphoplastic cells.

Necropsy can be carried out and lesions seen will include focal grey to white tumours, initially in the bursa, then liver, spleen, kidney etc. The liver may be very large. Microscopic examination will reveal lymphoplastic cells.

[[Category:Avian_Viruses]] [[Category:Retroviridae]][[Category:Expert_Review]]

[[Category:Avian_Viruses]] [[Category:Retroviridae]][[Category:Expert_Review - Viruses]]