Marek Disease

**Definition:** A transmissible viral disease of birds caused by avian herpesvirus 2 (HERPESVIRUS 2, GALLID) and other MARDIVIRUS. There is lymphoid cell infiltration or lymphomatous tumor formation in the peripheral nerves and gonads, but may also involve visceral organs, skin, muscle, and the eye.

**Tree numbers:** - C01.925.256.466.650 - C01.925.928.489 - C15.604.515.700 - C20.683.515.840 - C22.131.546

**Synonyms:** - Fowl Paralysis - Marek's Disease