Spray Provent-a-Mite on the quarantine enclosure. (Not on the snake!) Mites are the big worry in close quarters, because they can walk. I even periodically go and PAM all the way around the doorway to my quarantine area, though it's probably only minimally helpful.
The other common problem (and even from good breeders) is intestinal protazoa (aka "flagellates"). These are commonly transferred when water bowls are cleaned, but not sanitized or given time to dry completely. Make sure you either keep completely separate water bowls, or soak the bowls in 10% bleach solution and let dry completely.
For respiratory infections and IBD and other parasites, the separate room is probably enough if you follow strict quarantine procedures.
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