Infectious Coryza is usually acute and sometimes chronic, highly infectious disease of chickens, occasionally pheasants and guinea-fowl.
It is a bacterial disease characterised by catarrhal inflammation of the upper respiratory tract, especially nasal and sinus mucosae.
- The disease may be complicated due to secondary infections.
Morbidity is high but mortality low if uncomplicated, although it may be up to 20%.
- The route of infection is conjunctival or nasal with an incubation period of 1-3 days followed by rapid onset of the disease over a 2-3 day period with the whole flock affected within 10 days. The carrier transmission is via exudates and by direct contact. It is not egg-transmitted.
- The bacterium survives 2-3 days outside the bird but is easily killed by heat, drying and disinfectants. Intercurrent respiratory viral and bacterial infections are predisposing factors.
Signs
- Facial swelling.
- Purulent ocular and nasal discharge.
- Swollen wattles.
- Sneezing.
- Dyspnoea.
- Loss in condition.
- Drop in egg production of 10-40%.
- Lack of appetite.
TREATMENT
- Gently squeeze the swollen eyes to remove the white substance then apply Propeta drops or any other antibiotic eye drops in the eyes or wash with salt water solution.
- Administer antibiotics like Tylodoxy 200, Tylosin and preferably ESB3 30% in water for five to seven days.
NB:When already affected don't vaccinate. give them antibiotics like Eliseryl in water and applying Centrino on the swellings.
Never ever vaccinate sick birds.
The best prevention method is by vaccination at the age of 5 to six weeks and good biosecurity
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