I havent heard of this one yet but from what I have been able to find out so far it doesnt seem to be contagious.

Its a neurological problem. Most likely genetic.

IF the snake does have that I would not be worried about the other snakes BUT i wouldnt be so fast to put its problems on a neurological problem.

Id be more worried about the RI and keep it in a differnt room for a long time to be sure it doesnt have IBD.