Commonly made is the leap in logic that because it's captive bred it must be a cleaner healthier animal. The number of animals being kept in a healthy, sanitary environments is not governed by their point of origin. Neither does it follow that because an individual animal came from a large well known breeder that it is beyond scrutiny. I've toured large scale zoo collections that were kept very poorly and large scale exports whose husbandry skills in their holding facilities were far better than the average individual collectors. It is really all a matter of individual circumstances.
Familiarity is the best weapon with which to gauge what is necessary.
When that luxury is not available, then it's time to assume the worst, and work backwards. If you know an animal is clean. The animal has checked out clean, returned negative stools and Crypto tests, and displays normal patterns of behavior and physiology, then such an animal may be ready for introduction into a colony in as little as 30 days. On the other hand, animals coming from questionable environmental circumstances or unknown situations, or facilities where one or more problematic factors are known to exist, demand the utmost in precautionary measures be used. T aking my ERS study animals as a hypothetical example.