I may be aquiring a flock of bantams that have been strictly indoors in cages. They have been vaccinated and are NPIP certified under the current owner. My birds have always had coops that opens into a VERY secure sand run, and been allowed to free-range under supervision. I'd like to transition these birds into their own coop/run, post-quarrantine, if possible. I'm sure there are immunity issues for exposure to dirt and soil. Can they be successfully transitioned? Any recommendations?