Wry neck in rabbits is caused by a tiny parasitic organism called Encephalitozoon cuniculi. It infects other parts of the rabbit's body, but wry neck happens when the organism infects the rabbit's brain. Rabbits have an ability to wall off infections; it is thought that this organism develops pockets in the rabbit's brain where it basically sits, like a ticking time bomb, until some stress knocks the rabbit's immune system down a bit and the microorganism gets enough of an advantage that the rabbit starts showing symptoms. The medications mentioned kill the parasite, but whether the rabbit recovers depends on how badly affected it was. Some rabbits may have an episode and recover without treatment, some may wind up with a permanent tilt to their heads, some have several episodes with complete or partial recovery, and some rabbits die no matter what you do. But if you've been doing research, you have read all of this and more; you know this has nothing to do with diet or vitamin deficiencies; it would be nice if it did. We used to believe it was caused by an inner-ear infection, but now, we know it isn't that, either.
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