One of the reasons why I wouldn't take a snake a vet unless absolutely necessary. Vets don't shower and change clothes between clients. As for the expos, those have hundreds of herp owning people crammed in a very small space handling vendors' snakes. I expect mites and pathogens do get transferred. Not sure what the chance of bringing home mites on one's clothes actually is. If I were a vendor, I would be uneasy about the animals I brought back home. Do vendors commonly quarantine after a show?

It has never occurred to me to change clothes after purchasing mice from our local pet store. Mice are carriers of mites. That problem is one more reason I prefer F/T if the snake will take it that way.