Yep, if they didn't do a culture, I would definately get one to get to the source of the problem. Then you can treat it with proper medication. Of all the RI's I have read about on here, I have not heard of that medication being used. It could just be different strokes for different folks. I personally havent had to deal with RI, so who know.. Was it a regular vet, or one that specialized in herps ? From what I have read in these forums, regular vets do not seem to be much help with snakes. A herp vet would be much more knowledgeable in these matters. Good luck getting your babies well!