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.
- Loss in condition.
- Drop in egg production of 10-40%.
- Post-mortem lesions
- Catarrhal inflammation of nasal passages and sinuses.
- Eye-lid adherence.
- Caseous material in conjunctiva/sinus.
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.