I have a hen that I suspect has infectious coryza. I have searched online for weeks and found one site that actually explained it all. I assumed she had a tumor in her eye. I have a total of 15 hens and NONE of the other hens does not have any symptoms or are sick. I first noticed it in the hen about 2 months ago. I had her on antibiotics and she did seem to get better. I dont think I had her on them long enough and she seemed to decline again. I started all of them on Terramycin today and will leave them on it until the hen is fine. All the symptoms she has includes sneezing, bubbles in the eye discharge in the beginning - clogging of nostrils and sinuses with a sticky, putrid smelling exudate cheesy core in eye. She is eating and drinking normally although she does seem depressed. Why would she have it and none of the others have any signs and seem healthy? I hope she can overcome this.