الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Infectious bursal disease (IBD) is an acute immunosuppressive disease of chickens that, despite various vaccination strategies, continues to cause significant economic losses in the poultry industry. The current study aimed to determine the prevalence of IBDV infection in relation to various vaccination programs and other risk factors in three different Egyptian provinces. As a result, 69 chicken flocks were studied clinically and molecularly, with 62 flocks (case flocks) suspected of being naturally infected with infectious bursal disease virus (IBDV) and 7 flocks (control flocks) apparently healthy. The investigated diseased flocks had whitish diarrhea, depression, ruffled feathers, bursal lesions, nephrosis, nephritis, hemorrhages on muscles, and petechial hemorrhages at the junction of the proventriculus and gizzard.