It's not documented as IBD in colubrids, and is only known to exist in its disease state in Pythons and Boas. But there has been second hand keeper reports of owners showing colubrids with signs of IBD. Again, second hand keeper reports, not real scientific theory or documentation! Just keep in mind that diseases can evolve and can learn to effect different organisms, so nothing is ever out of the question until proven otherwise on a case by case basis.