The cause of the flu in chickens is a virus and sometimes it is caused by bacteria as well. The symptoms of chickens' illness ... the breeder will notice it in a simple way: the chicken will have clear mucus flowing from its nose. The chicken will have a little tears. Later, the mucus will gradually thicken, turn white, clear, yellow, and form a stain on both nostrils. The symptoms of chickens.. will show symptoms as having difficulty breathing, breathing loudly, especially at night, which will be clearly audible, or having frequent coughing or sneezing. If it is severe, the chicken will show symptoms of swollen face and eyes, or in common language it is called (swollen face disease), swollen eyes, lots of tears. 🐔 Treatment is by giving antibiotics and reducing swelling and inflammation to feed and monitoring the symptoms. Veterinarian in charge: Dr. Sirikanya Chang-ekkawong (Dr. Joy), Department of Special Animal Care (Exotic), Department of Internal Medicine