KLIM
 |  موضوع: Poultry Amyloidosis  9/4/2011, 01:10 | |
| Poultry Amyloidosis
Amyloidosis
Introduction
A Coronavirus infection of chickens with a morbidity of 50-100% and a
mortality 0-25%, depending on secondary infections. Infection is via the
conjunctiva or upper respiratory tract with an incubation period of
18-36 hours. The infection spreads rapidly by contact, fomites or
aerosol. Some birds/viral strains can be carriers for up to 1 year. The
virus, which may survive 4 weeks in premises, is sensitive to solvents,
heat (56°C for 15 mins), alkalis, disinfectants (Formal 1% for 3 mins).
Poor ventilation and high density are predisposing factors.
Signs
* Sudden death.
* Muscular shivering.
* Otherwise as for standard IB.
Post-mortem lesions
* Oedema of pectoral muscles and subcutaneously on abdomen, lesions
progress to necrosis and scarring of deep pectorals in convalescence.
* In layers the ovules may be intensely congested.
* Other lesions of 'classical' IB may be encountered.
Diagnosis
3-5 passages in CE allantoic cavity, HA-, typical lesions, FA,
ciliostatic in tracheal organ culture, cell culture (Vero, CK) only
after adaptation Serology: HI, Elisa (both group specific), SN (type
specific), DID (poor sensitivity, short duration, group specific).
Treatment
Sodium salicylate 1gm/litre (acute phase) where permitted - antibiotics to control secondary colibacillosis (q.v.).
Prevention
Live vaccines of appropriate sero-type and attenuation, possible reactions depending on virulence and particle size | |
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خالد الرواضيه
| | موضوع: رد: Poultry Amyloidosis 9/4/2011, 01:36 | |
| انت نبع من الابداع
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