Mycoplasma infectious sinusitis.

Occurrence: Worldwide.
Species affected: All.
Age affected: All.
Causes: Small procaryotic microorganisms- Mycoplasma gallisepticum; M. meleagridis. Spread through egg contact or contact with infected birds by aerosol.
Effects: Signs include nasal discharge, emaciation, increased condemnation, sneezing and coughing, swollen infraorbital sinus (above the eye), feed refusal, foaming of the eye and/or air sacculitis.

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Causes

All species of bird or all ages are susceptible to this chronic disease. The agents involved in the aetiology of this disease are Mycoplasma gallisepticum (MG) and M. meleagridis (MM) in turkeys. (MM is found only in turkeys).

Mode of transmission

Spread through egg or contact with infected birds by aerosol.

Clinical signs

Signs include nasal discharge, emaciation, increased condemnation, sneezing and coughing, swollen infraorbital sinus (above the eye), feed refusal, foaming of eye, and/or air sacculitis.

Postmortem lesions

Caseous sinus and air sacculitis can be seen.

Diagnosis

Serological tests include plate agglutination, HI or ELISA test. Isolate organism from the sinus and identify with antigen capture ELISA test and monoclonal antibody; fluorescent antibody or PCR. It simulates many diseases including coryza, NDV, E. col. and IBV.

Prevention

Depopulate infected stock, hatch clean stock only, vaccination of pullets for MG with live or killed vaccine to prevent the disease.

Treatment

Antibiotics include tylosin, lincomycin-spectinomycin, quinolones and spiramycin.