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[xycom]

It's not airbourne according to Raymond Hoser

All transmission in over a dozen confirmed cases was by fluids, in the form of blood (via mites), water bowls, cleaning cloths or feeding utensils as in forceps.
Airborne transmission did not occur even when affected and unaffected snakes sat within 3 cm of one another and with their cages connected via air-holes in direct line of sight, even though they remained in such a position for weeks.

http://www.smuggled.com/OPMV3F.htm