There is no antivenin for centipedes or tarantulas, so working at a Zoo wouldn't help in a bite case from those, except for the possible workman's compensation lol.

I've got 20+ years of dealing with exotics, and I know many people who have worked in Zoos with venomous animals for very long periods of time without getting bit. The old "its not IF but WHEN" saying is not applicable all the time.