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There is a disease called IBD that seems to be most common in boas (I'm not saying it is common occurring disease - I don't want to be misunderstood) and it can be spread to pythons and some colubrids I believe (usually proving fatal very quickly) but I don't believe IBD is as common as some believe. The key that I go by is to get boas (and any snake) from reputable people/breeders. Skiploder posted a very informative thread on IBD: I'd do a search for it.