A few weeks ago I brought home a pullet that was sneezing. Hadn't been sneezing, started when I was driving home. When I got home and unloaded her, into quarantine, I noticed another one of my pullets sneezing. A coon got all but 1 (sneezing) pullets I had in quarantine. Figured since I had another one already sneezing, and the fact of the coon, I put them together. Then I did a week of antibiotics. Sneezing didn't stop but didn't get worse. Fast forward to today. 2 pullets still sneezing. Now I have 1 adult sneezing, and all sneezing birds have black discoloration around nostrils and down the top of their beaks. (I have pictures.) several other birds have the same discoloration, but no noted sneezing. Everyone is eating and drinking and still laying when appropriate. Other than sneezing and discoloration, no other symptoms. I haven't repeated antibiotics because it hasn't made a difference. Thought? No noted drainage from the nose. I did note my RIR regurgitated water the other day when I went up to lock every one up. However she isn't sneezing so not sure if its relative.