Marek's Disease (MD, Range Paralysis, Gray Eye)
David D. Frame (Utah State University), Sarah Tilley (North Carolina State University), Mark C. Bland (Cutler Associates International)
What is it? Marek's disease (MD) is the most commonly diagnosed disease in backyard chickens. Many types of birds can be affected, but chickens seem to be the most susceptible. Marek's disease is caused by a herpes virus that results in tumors in various parts of the bird. Once infected, the birds become carriers for life. The virus is present everywhere in the environment where chickens are raise...