I would start with these:
(1) What is the true incidence rate of IBD in boas? If a number is not available can you explain why not?
(2) How long can an animal be asymptomatic?
(3) Have you had any control animals sent to you for study that ended up being asymptomatic carriers?
(4) Do you know of any boa breeders that actively screen their animals?
(5) Are any boa breeders contributing to IBD research?