Species-specific. Mammal parasites aren't able to be transferred to reptiles. Mammal parasites are designed to live in that 100-102 degree body and when they hit that 80-85 degree body, they just die or get digested by the snake's powerful gastric enzymes. Not to mention, when the eggs/parasites are inside the body, they aren't in the infectious stage. It's when an animal ingests the eggs that other animals have excreted(feces), or they drink water that is contaminated(with feces or giardia), that they become infected.

I've done fecals on my colony of mice and they have about 1+(how many eggs per field) pinworm ova on the slide. I've also done fecals on my snakes at varying intervals, and have found digested pinworm eggs on the slides(1 per every 2-4 fields, it takes awhile to find one that actually made it through). This doesn't mean the snakes are infected, it just means that the pinworm eggs inside the mice weren't digested fully when in the stomach, so they're able to pass through with the feces.