is another respiratory disease. Symptoms are swollen eyes, runny nostrils and eyes, with a particularly foul smell. Birds often show stained wings where they repeatedly wipe their eyes. This disease usually occurs when there is cold weather, (change of seasons is a high risk time) dusty conditions and in high pollen seasons. Antibiotics are used to cure this disease, however recovered birds remain carriers and will become continually reinfected. Some breeds and strains of chickens seem to be more susceptible than others. "
from the Happy Hen House website.
Perhaps you should search for infectious coryza and see if the symptoms sound similar. Good luck!