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Also known as Epidemic tremor

Avian encephalomyelitis is a peracute disease occurring worldwide. It affects in all poultry species aging from 1-3 weeks and adult birds in lay.

Causes of Avian encephalomyelitis

AE is a peracute disease affecting all poultry species. Young birds from one and three weeks of age and adult birds in lay are affected. The AE virus is a small RNA picornavirus lacking an envelope. It is spread vertically through the egg for 5-12 days after infection and horizontally by contaminated faeces and fomites.

Effects of Avian encephalomyelitis

Incubation period is 1-7 days. Signs include trembling of the head, lateral recumbency (birds down on their sides), etaxia, and dull eyes. In chicks, drowsiness, lack of coordination, unsteady gait, and mortality of 5-10% is seen in chicks, a drop in egg production and cataracts (opacity of lens) can be seen in adults.

Diagnosis of Avian encephalomyelitis

Diagnosis is by virus isolation AE can be confirmed by inoculating susceptible chicks or embryos at 57 days and observing the hatched chicks for clinical signs. Histopathology of the brain (cerebellum), spleen and heart lesions, and virus neutralisation test or ELISA to measure antibodies are helpful. Lateral recumbency in chicks is a presumptive diagnosis for AE. Blindness due to cataracts may develop in chickens that have recovered from an early AE infection during the first three weeks.

Treatment & Control of Avian encephalomyelitis

There is no treatment. Chicks should be purchased only from immune parents. Vaccinate pullets at 10-16 weeks by wingweb or eyedropper. The vaccine spreads rapidly through pullet flocks reared on the floor system (contact with faeces) so all birds do not have to be vaccinated. However, it is advisable to vaccinate all birds when reared in cages or on slats.

 

المصدر: Akrum Hamdy
AkrumHamdy

Akrum Hamdy [email protected] 01006376836

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نشرت فى 22 يوليو 2010 بواسطة AkrumHamdy

أ.د/ أكـــرم زيـن العــابديــن محـــمود محمـــد حمــدى - جامعــة المنــيا

AkrumHamdy
[email protected] [01006376836] Minia University, Egypt »

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