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 can't listen to it's breathing, or watch it's behavior. I can say that the poor thing has suffered enough, please do the right thing and put it out of it's misery. We come here and help where we can, we can't solve your problem, all we can do is enable you to solve it.