• Ill birds: reservoirs
• All ages of chicken are susceptible
• Incubation period:1-3 days
• Disease course:2-3weeks
• Mortality 20%
• Direct contact, airborne droplets, and
contamination of drinking water.
• Egg transmission does not occur.
• Facial swelling.
• Infra orbital sinusitis
• Oedema of face, around eyes
• Oedema of wattles and intermadibular space in male birds
• Purulent ocular and nasal discharge
• Loss in condition
• Drop in egg production of 10-40%
The histopathologic response of respiratory
organs consists of disintegration and
hyperplasia of mucosal and glandular epithelia
and oedema with infiltration of heterophils,
macrophages, and mast cells.
• Isolation of a gram-negative bacterium.
• Catalase test
• Polymerase Chain Reaction
• Haemagglutination-inhibition (best)
• Mycoplasmosis: Chronic respiratory disease:
no involvement of infraorbital sinuses, in
turkeys: infra orbital sinuses are involved’
• Infectious laryngotracheitis: no involvement of
• Newcastle disease: nervous signs
• Fowl cholera: no respiratory signs
• Infectious Bronchitis: caseous plug at
bifurcation of bronchi
• Sound management and isolation.
• Replacements should be raised on the same farm or
obtained from clean flocks.
• If replacement pullets are to be placed on a farm that
has a history of infectious coryza, bacterins are
available to help prevent and control the disease.
• Vaccination should be completed 4 weeks before
infectious coryza usually breaks out on the individual
• Controlled exposure to live organisms also has been
used to immunize layers in endemic areas.