I recently brought home a rooster from a friend of mine. He and my other rooster had a disagreement, so I penned him up. Two weeks later I realize he is sick. Snotty nose, nasty smell, loss of weight, loud raspy respiration. I started treating with Sulmet and the loud respiration went away. I thought he was getting better, but then one side of his face swelled up so much he couldn't open his eye. I decided the best option was to cull both him and the other rooster. Now I have two Turken pullets in my flock that got sick. One had a snotty nose as her only symptom, I am treating her with Sulmet and she is better. The other one has no snotty nose, but does have the loud raspy respiration this morning. I am treating her now as well. They both also have a bit of blood in their poop? I am pretty sure from the roosters symptoms I am dealing with Coryza. My question is, can I assume all my chickens are exposed since they sleep in the same coop together? I have chicks that are 6 weeks, 10 weeks and 4 months old. The Turkens are in the 4 month old group. If I separate the young ones do I have a chance they may not have contacted it? From what I have read about it, young ones don't get it? Or should I assume they will all carry it from now on? I really don't want to cull all my chicks.