I'm with James here. All we can do is direct to you to information can be of assitance, which James has done. If you feel like you have a disease in your flock, contact a vet for immediate assistance. I'm not there to smell the birds nostrils to see if it has a foul odor coming from them, I...
Euthanize that poor bird immediately, please. If you don't know how watch the video in my signature on slaughtering quail. I'ts unacceptable to let a animal suffer that much.
Everyone remember how I always say, if a gamebird bleeds or is weaker than the rest it must be removed from the cage...