In the present study Reoviruses and IBDV were isolated from clinical cases of chickens showing retarded growth. The Percent of virus isolation was 12.1% for Reoviruses and 39.6% for IBDV. The titer of the selected Reov isolate was 10⁴.⁸ EIDSO/0.2ml while it was 10⁴.²EIDSO/0.2ml for the selected IBDV isolate. Pathogenecitity trials with the isolated viral agents revealed retarded growth with variable degrees where the decrease in body weight ranged from 66.3_70%, and 40_42% after Reovirus and IBDV infection respectively depending on the inoculation route