I go by the assumption that all animals in the wild have parasites, so you should take the proper precautions to quarantine your animals.

When you look at how abundant parasites are in the world and how their life cycles are perfectly molded to correspond to their respective hosts, there really is no way for any predator in the wild to avoid getting them. Every single prey item is a potential vector for disease, so if by chance you do catch a snake that turns out to be parasite-free, that means the snake hasn't had enough meals in its lifetime either because it's still a baby or because there's a shortage of food. This is actually a method scientists use to gauge the effects of habitat destruction and pollution since a missing link can effect the entire food chain.
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