Fowl coryza

Asked January 15, 2018, 9:54 AM EST

Fowl coryza symptom and how to treat it

Outside United States poultry

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Clinical Signs

Typical signs of coryza include the following:

  • Swelling around the face
  • Foul-smelling, thick and sticky discharge from the nostrils and eyes
  • Labored breathing
  • Rales

In addition, the eyelids of an infected bird can become irritated and might stick together. Diarrhea may occur. Growing birds may become stunted. Infection can decrease egg production and increase the incidence and/or severity of secondary infections.

Mortality can be as high as 50%, but 20% is more common. The disease can last as little as a few days or as long as a few months, particularly when secondary infections occur.


Because coryza is caused by bacteria, antibiotics can be used to treat a flock. It is important to follow the labels on any medication. Although antibiotics can be effective in reducing clinical signs of the disease, they do not eliminate the bacteria from carriers.