Looks like some more out of that coop, including my wonderful blue-egg stock rooster from Lensters, are infected as well with the respiratory disease. Thought I had a handle on it. Looks like I may have to cull an entire coop of blue-eggers and marans. This is just devastating. I'll probably end up culling everyone obviously infected, clean, wait to see if anyone develops symptoms. Whatever this is causes sneezing, rattling breathing, watery and irritated eyes, clear to white mucus from the beak, respiratory distress, and finally death. From everything I've read, it appears this is either Coryza or CRD, and you can treat it with Tylan, but they'll still carry it and possibly infect new birds. So, my friends, should I just cull everyone in that coop (I have 2 other unaffected coops), or just the infected ones and take the wait and see with the ones that don't appear infected? I could really use some advice.