Have you ever had a feeder rodent Necropsied? They carry all sorts of things. Things that are not always present in thier wild counterparts.
It's not that the snake in question won't survive, it likely will. But, why take the chance of taking something out that doesn't need to be. Suppose it's carrying a virus or bacteria that it picked up in captivity in SPITE of being in a different room. There are airborn nasties too.
The question was asked, answers have been given. Do what you feel comfortable with.