So just how common and how contagious IS IBD?

[meowmeowkazoo]

you can read this too, it notes that it is common in venemous but also seen in colubrid, boid, and elapid snakes as well.

http://labs.vetmed.ufl.edu/sample-re...nfections/opm/

I read that page and a few others, which is why I said it seems much more common in vipers, not that it's exclusive to them.