I wouldn't see any cross contamination with any other snakes, he's the only snake in my home. I did rescue a bearded dragon a month before he stopped eating but she was seen by the vet and checked out for all parasites, no respiratory infections. And I followed quarantine process. She was the last one taken care of during the day, last one touched and I'd had a change of clothes and shower before I came into contact with my boy or the three leopard geckos I've got. Gecks are doing great, bearded dragon had some runny stool for quite a while which was why I was thinking she had parasites of some sort but she's doing great now, stool is nice and firm. Poor little dear was stunted when I got her, she grew over a foot in a month. I did notice that the rats I'd been getting from my previous source which was a local store were starting to look really gross, covered in urine and tails stained with feces so I changed who I got from, ordered a batch of rats from rodent pro but my boy had stopped eating before I bought those so he's passed on every one from there so far. ::shrug:: I was beginning to worry maybe because the rats were starting to look dirty that maybe that had gotten him sick. And he hasn't had a poo since December because he hasn't eaten any. So is there another way to check for parasites? And is it possible he could have gotten something from the bearded dragon coming into the home? I'm not sure about lizard to snake cross contamination chances even when super careful.