I have integrated chickens into my flock. Always quarantined them with the exception of the first time. One of the new ones was sick and respiratory infection spread throughout my flock. I don't integrate into my flock now because it's a lot of work and I'm 3 days older than dirt. LOL. This is all good advice, but in the end it needs to be if the person is willing to go the extra mile to go the extra mile to quarantine the new bird. Love this link. So much info.