I have a couple of bantams that have very swollen infected eyes. It came on pretty fast. It's been very cold (-20) and even though their coop is very insulated it is still just cold! I brought the sick ones in the house and have been giving them Terramycin in thier water for 3 days. No improvement. Any idea what is causing this and what a better treatment might be? I talked to a friend of mine 200 miles away and she has been having the same problem with some of her regular chickens.