I don't know if it helps, but I had an adult duck have the exact same thing happen. Severe ataxia, seemed ready to die for a while. Cured overnight with no help from me. 
It happened to a chicken once too, but that was several years ago and presented more as lameness than neurological symptoms.

It happened to a chicken once too, but that was several years ago and presented more as lameness than neurological symptoms.
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