The First Record of an Aggressive Form of Ocular Tumour Enhanced by Marek's Disease Virus Infection in Layer Flock in Al-Najaf, Iraq.

Marek's disease (MD) is a highly infectious poultry illness with a tendency to form tumours in peripheral nerves and internal organs of affected birds. Tumours accompany MD, mostly caused by oncogenic Gallid alpha herpesvirus 2 (MD Herpes virus serotype I). Studies on avian tumours associated with MD infection are limited in Iraq.