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Lymphoid Leukosis is a disease that affects chickens caused by the retrovirus Avian leukosis virus.
It is a neoplastic disease caused by a virus of the leucosis which may take the form of a tumor of the bursa of Fabricius and metastasis to other tissues of the chicken and cause enlargement and swelling of the abdomen.
Symptoms
Symptoms include enlargement of abdomen, bursa, weight loss, weakness and emaciation, and depression. The disease is more likely to affect chicken around five to eight months of age who are more vulnerable. Green diarrhea tends to develops at the terminal stage.
References
Lymphoid Leucosis Wikipedia(Text) CC BY-SA