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Coryza Virus – Chicken’s Cold

Coryza virus

Coryza Virus – Chicken’s Cold:

Coryza Virus is the medical term for Common Cold. Usually, it is more severe in chickens than in humans.

Clean Chicken

What Causes Coryza Virus?

Coryza Virus is caused by the bacterium called Avibacterium (Haemophilus) Paragallinarum.

Flock of Chicken

Moreover, Coryza Virus is acute and sometimes chronic. It is a highly infectious disease of chickens. Also, it is characterised by catarrhal inflammation of the upper respiratory tract, especially nasal and sinus mucosae.

Incubation Period

Coryza Virus is airborne. The virus passes directly by infected droplets, contaminated feed, water, bedding, or dust particles. The disease’s incubation period is 1-3 days. Further, it is followed by rapid onset of the disease over a 2-3 day period. The infection can affect the whole flock within ten days. However, it is possible that if you catch it early enough, you can isolate the infected birds.

Poor, unsanitary housing and overcrowding exacerbate the problem. In other words, the bacteria can increase in the coop if the circumstances are favourable. An anaerobic bacillus can thrive in an atmosphere with little oxygen. Therefore, a damp and dirty cage is the ideal breeding ground.

Signs and Symptoms:

Following signs and symptoms are observed in affected chickens.

  • Facial swelling.
  • Foul-smelling, purulent ocular, and nasal discharge
  • Swollen wattles
  • Sneezing
  • Dyspnoea (laboured breathing)
  • Weakness.
  • Decreased egg production of up to 10-40%
  • Loss of appetite

Swollen face

Possible Treatment To The Disease:

Antibiotics can treat Coryza Virus. Appropriate antibiotics prescribed by a veterinarian should be used. The use of wrong antibiotics can harm the chickens in the long run. The antibiotics treat the infection. However, the chickens become carriers of the disease for a lifetime. It may have relapses from time to time and require antibiotic therapy.


The mortality rate is around 20%-50% in chickens. It depends on different factors. The older the flock, the higher the mortality rate. With an ongoing common infection present, it increases the mortality rate due to low immunity.

Prevention of Coryza Virus:

So, Coryza Virus – Chicken’s Cold, Should We Care Or Not? The virus is killed by heat, dry surroundings, and disinfection. Therefore, avoid using cold and damp housing as it increases the chances of the growth of bacteria. Moreover, if your flock becomes infected, no other poultry owners should visit you. Additionally, it would be best not to meet them while the infection is ongoing to avoid the transfer.

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