الفهرس 
Introduction
History and etiologyOnly 14 pages are availabe for public view
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Abstract
1. The degree of exposure of chicken flocks to infectious bursal disease virus (IBDV) at different localities in Assiut and El-wadi El-Gadid Governorates were studied serologically and virologically.
2. 31.59% of the examined serum samples from breeding flocks showed precipitins to IBDV.
3. 40% of the negative serum samples in the AGP test showed neutralizing antibodies.
4. Out of 440 untreated yolk samples examined by the AGP test, 53 (12.04%) were positive. Treatment of yolk with chloroform help the detection of undetectable precipitins by the AGP test (17.27%).
5. Day-old chicks from Beni-Mur poultry farm possessed precipitating and neutralizing antibodies to IBD virus which protected 20% of them up to 2 weeks of age.
6. 12 isolates IBDV were recovered from 563 moribund and dead, 3 - 9 – week-old chicks.
7. Two isolates were subjected to physical chemical, serological, and biological characterization.