I've had at least two Marek's chickens suffer with, and then reportedly die from, the neurological form of this disease. Both of them walked backwards and at times even in circles. They would suddenly be that way for a day or two and then just as suddenly, they'd go back to being 'normal'. Another one of mine, a roo, had the ocular form and went blind before he died (he also got bats**t crazy towards the end too) and yet another hen had the severe paralysis form. Currently it appears as if a good number of them are starting to whither away on the vine, leading me to believe that there will be more deaths by wasting and opportunistic diseases (from immuno-suppression) in my not so distant future.
Do you ever get the thought that it's just never going to end? I know I sure do...
-kim-