The only symptom is diarrhea with the grown hens. I have 10 new baby chicks. 2 have cocidosious. Labored breathing, lethargy, not eating or drinking much. They have been separated from the others. I was told to treat them all because they have been together. I'm not sure why I would need to treat the grown hens as they are in a different coop. But as I said, I'm new at this. Especially sick ones.