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Mareks disease usually affects young chickens, but older chickens can still be affected if a carrier is brought into the flock. It takes at least 3 weeks after exposure for a chicken to have symptoms. Mareks is spread through feather dander, so it would be hard to prevent it from spreading in...

I am not an expert on Mareks disease, but I think there is a possibility that she could have the ocular form of Mareks disease. It can gradually cause the eyes to grey in color, and the iris can change shape to make the pupil look less sharp. But I have also read where avian encephalomyelitis...