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- #51
Botulism is usually quick. Yes, it could be a tumor or some illness. Without a professional diagnosis, I think the best you can do is look at all the possibilities, rule out as many as you can, and see what's left.
With Marek's, the suffering is usually wasting away.
I have done just that and come up with limited explanations. Most likely atypical mareks, which seems remote as she was vax and has never been around other chickens other than her brooder mates, or some congenital illness such as heart condition or rumors.
Still not much hope for any....