Infectious Coryza

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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