IT'S WAY WORSE THAN I THOUGHT! I got Duramycin for CRD, but I am thinking it's Coryza because one chicken has bubbles on her eyes. I went through and did a closer look and as the morning progesses I only have FOUR chickens WITHOUT symptoms! It's clear that it came from the 2 golden comets I got at WCA and this is going to be the hardest life lesson I've ever learned on quaranting! The two comets are in bad shape, eyes closed, mouths hanging open, combs are very light. They are still in there separate pen with the 2 production reds. The reds are acting fine and have no snot or eye problems, but their combs seem pretty light. I'm afraid to let them out since they've been with the comets the whole time so those 4 are together. Duramycin in the water, but no one drinking and I don't think it helps with Coryza. When/who do I cull? Second issue: All my original chickens besides 4 have symptoms of runny noses. One has little clear bubbles in her eye which is what made me think Coryza, but she's still running around eating and clucking. My original chickens (including the one with the eye) and all with the runny nose are in their pen with the duramycin in their water. The four with no symptoms currently are out running the back yard because I don't know what to do with them. They have a separate water container in the yard and I put a little duramycin in it just to be sure. My original chicken I posted about this morning isn't looking any better and she's in my bathtub. I gave her some duramycin via eye dropper so hoping I see an improvement but if it's coryza don't know that I will. Calling vet school you posted about now. QUESTIONS: How do I know which to cull and I don't want to do it if I don't have to (By the way there are 2 out of the entire flock that I won't cull) What is the treatment for Coryza? Do I have the birds separated correctly? Thank you in advance for any help. I've been keeping chickens for about 6 months now and I'm learning a lot of things the hard way. I really appreciate everyone's knowledge, always living in the city I know next to nothing about farming/livestock.