Is it possible that they just got an respiratory infection from the dirt. I was convinced they had coryza. I culled most of them right away. The few I decided to treat, after 3 days, they look like healthy birds. They wre only a little snotty. I've been running around smelling everyone faces, (like a freak) and most have the same scent. Maybe like chicken breath, but not like something dead or rotten. I think I've got myself totally paranoid and confused. All the other birds have been around the ones I culled. So if it was/is Coryza wouldn't it have already ran through Everyone??? Only the group that was raised in this certain cage got sick! Hopefully I'm over reacting and with my frantic cleaning and disenfecting and NOT ever using that cage again, I've got it under control. I bought oxine and started giving them more ACV and organo oil in there water. This started over 5 weeks ago. How quick does coryza spread? I have both older and younger birds. I try but I know my biosercurity isn't the best. I;m hoping I've over reacted and thought the worse as always.