I have 11 bantam cochin chicks, two of which are 3 months old and the rest are 2 months old. About 2 weeks ago, I noticed that 4 of the birds had a swollen eye, either closed or nearly closed, with no detectable discharge. Most are eating well, except for one chick which has the infection in both eyes, and I'm assuming, has very limited vision. In the past few days, many of the chicks are now sneezing and have runny noses. Some of the birds with the swollen eyes are having the cold symptoms, and some are not, so I think I have multiple issues going on here. I have been using tetracycline hydrochloride powder in their drinking water for a week or so with no improvement. I have also treated the sickest chicks with injectable tylosin for three days now with no improvement. The injectible meds usually result in quick improvement when birds have respiratory infections. The symptoms of sneezing and runny noses seem much like a human cold which is, of course, untreatable with meds since it's a virus. So my questions are: do chickens get viral "colds?" Is there anything to treat this? Will the infection just run it's course and clear up or will these birds ultimately die? So far the chicks are all relatively strong despite the "cold" and swollen eye symptoms. The antibiotics are not touching the symptoms. What should I do?