Printer-friendly versionSend by emailPDF version

Infectious coryza is an infectious disease of bacterial origin that affects chickens.

Situation in America: 

Infectious coryza is present worldwide, although its incidence varies depending on the region and year.

Susceptible species: 

Chickens only, adults are more sensitive

Etiological agent: 

Infectious coryza is caused by Avibacterium paragallinarum, a Gram-negative, immobile, non-spore forming coccobacillus belonging to the Pasteurellaceae family.

Methods of transmission

The disease is primarily transmitted through direct contact with infected birds. Contaminated inanimate vectors can also be responsible for contamination.


- Incubation period: 3 to 7 days

- Symptoms: appearance of a malodorous discharge, first serous then mucopurulent, from the eyes and nostrils, sneezing, coughing, dyspnea combined with diarrhea, a loss of appetite, weight loss and a decline in egg laying

Possible recovery in two weeks, with chronic disease carrying, or death due to secondary complications

Laboratory diagnosis: 

- Detection of the pathogenic agent by isolation in a specific environment (blood gelose) and biochemical identification

- Detection of antibodies through haemagglutination inhibition



Adherence to standard hygiene and breeding rules (sufficient aeration, avoiding overcrowding, clean litter, etc.)

In infected areas, the elimination of infected, ill or recovered birds and the thorough disinfection of premises


New forum topics