Sabry ElSayed Omar Salem <br/><br/>
Present Status of Infectious Bursal Disease in Chickens in Egypt /  
 الوضع الحالى لمرض التهاب كيس فابريشيا المعدى فى الدجاج فى مصر 
Sabry ElSayed Omar Salem ; Supervised Mohamed Hussein Hassan Awaad , Mohamed Mohmoud Zaki , Abd El Rhman Kamal Khafagy 
 - Cairo :   Sabry ElSayed Omar Salem ,   2006 
 - 215L :   ill ;   30cm 
<br/><br/>Thesis (PH.D.) - Cairo University - Faculty Of Veterinary Medicine - Department Of Animal Diseases 
<br/><br/> flocks vaccinated against IBDThe results revealed that the IBD infection still a problem in the vaccinated flocksTwo forms of the disease still occur (clinical and subclinical forms) A major antigenic shift in IBD viruses has occurred in the field situation including classical , a typical classical , untypable variant and Del / E variant of IBDV (based on AC - ELISA) Revision of current vaccination programmes for control of both clinical and subclinical forms of the disease are requested 
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<br/><br/><label>Subjects--Index Terms: </label>Chickens infections bursal present status