Infectious coryza is a contagious bacterial respiratory infection of chickens. While there are reports of a similar disease in other birds such as pheasants and guinea fowl, there is considerable doubt if these non-chicken cases are associated with the same aetiological agent. The disease occurs most often in adult birds. Infection can spread slowly, with chronic disease affecting only a small number of birds, or rapidly, with a higher percentage of birds being affected. Clinical signs include swelling around the face and wattles, watery or pus-like discharge from the eyes and nostrils, difficulty breathing, sneezing, loss of appetite, weight loss and a drop in egg production.