Home Articles for Vets Infectious Coryza

Infectious Coryza

by aliraza

Infectious Coryza

Infectious Coryza is caused by the bacterium Haemophilus paragallinarum The route of infection is conjunctival or nasal with an incubation period of 1-3 days. Carriers are important with transmission via exudates and by direct contact. It is not egg transmitted.


  • Facial swelling.
  • Purulent ocular and nasal discharge.
  • Swollen wattles.
  • Sneezing.
  • Dyspnoea.
  • Loss in condition.
  • Drop in egg production of 10-40%.


  • Post-mortem lesions
  • Catarrhal inflammation of nasal passages and sinuses.
  • Conjunctivitis.
  • Eye-lid adherence.
  • Caseous material in conjunctiva/sinus.
  • Tracheitis.


A presumptive diagnosis may be made on signs, lesions, identification of the bacteria in a Gram-stained smear from sinus. Confirmation is by isolation and identification


Streptomycin, Dihydrostreptomycin, sulphonamides, tylosin, erythromycin.

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