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Turkey coryza, caused by Bordetella avium, is a highly contagious disease of the upper respiratory tract, characterised by high morbidity rates (80–100% in 1–2 days) and mortality rates of 10–60%. The disease is common in young turkeys, mainly 2–6 weeks old, especially heavy line turkeys. However, the pathogen is also isolated from Muscovy ducklings, quail and cockatiel chicks. Bordetella avium is also a predisposing factor for other respiratory pathogens. The diagnosis of turkey coryza is based on clinical signs (sudden appearance and rapid spread in young turkeys), bacterial isolation and serological examination. Treating turkey coryza is difficult; sulphonamides/trimethoprim can be effective; however, relapse can occur. In humans, B. avium can cause acute purulent endophthalmitis. The control of turkey coryza is based on implementing hygienic measures and vaccination with inactivated and live attenuated commercial vaccines and autogenous vaccines.