All poultry herders have and can share totally different stories when it comes to experiences. I have a breeding group of Pharoahs in a small coop inside my chicken coop/run. They have been there for at least 6 months without any issues. Then again, I have had birds from my breeder quads who were being kept pretty far from the chickens and other quail who simply drop dead. No rhyme or reason. What works for me here is communication! I have bought birds from friends that became sick and died, I notified the breeder to help them contain their problem and get it repaired and they restarted healthy flocks. Secondly, know who you get birds from... I get mine from friends so I know that their birds are healthy.