I posted part of this post in 'everything else chicken' but thought I should probably ask here too... I recently purchased 4 hens from a local farm auction... bad idea! Three of them have what I strongly believe to be infectious coryza. The forth one shows no symptoms at all after a little more than a week but I did notice that one of her eyes looks completly normal while the other is very dark... almost black. Is that a symptom of anything? I've nursed the other three back to where they are showing no symptoms and I know that they remain carriers of the disease, but do they keep getting sick over and over or do they basically remain symptom-free once they have already had them? I know that the best thing to do would be to cull them but I've grown attached after nursing them along and my heart would just hurt too much to do that. Any advice would be greatly appreciated.