Infectious Bronchitis. Infectious Bronchitis is a diseases respiratory based in backyard flock chickens that is relatively common. This condition is also known as Bronchitis and a Cold. This disease is specific to chickens in particular when it comes to types of poultry.his is extremely common among backyard flocks of chickens. Chicken diseases symptoms include many of the following: 1  Distinguishable smell that is relatively foul based. 2  Discharge from the nasal cavity and the eyes. 3  Challenges in breathing. 4  Mild to severe diarrhea.