I'm going to forget unless I post this, but I advise you to stay away from expos. In particular the jobbers that have found a loophole in the trade. Your animal caught this probably from being housed with either infected bloods, or mixed species, transmission via contaminated water. Something was WC, as it is unlikely a CB specimen from established CB bloodlines would exhibit those particular afflictions. You never know how those snakes are kept until they are sold. Should you buy from a breeder, pay for a fecal examination before you buy, blood also if possible. A reputable breeder who maintains healthy stock should not object. Cheapest insurance you can buy.