Exterior lesions are restricted to the non-feathered parts of the body, usually the face and legs and are characterized by proliferative and necrotizing dermatitis.
The presence of retinal pigment cells invariable indicates proliferative retinopathy and is only seen in association with a retinal detachment or tear.
His areas of research interest are phytochemistry, antimicrobial, antimycotoxigenic, antioxidant, anti-proliferative and other bioactive properties of phytochemicals.