Crypto can be passed in that manner, but it can be paseed by you, by cage equipment, etc. It is passed in the snakes feces and when a snake crawls through the cage, the cysts stick on the snake.
When you hold that snake or it crawls agross something in its cage, then some of the cysts come off on whatever the snake is touching. So if you hold him, then hold another snake in your collection, you are passing the cysts to that snake.
Unfortunately is is an disease that is hard to confine to a single animal in a collection. Ultimate quarantine procedures are a MUST!!