Infectious bursal disease Virus (IBDV) specific reverse transcriptase/polymerase chain recation (RT/PCR) positive 40 broiler bursa fabricius samples obtained from a commercially reared flock were investigated for genetic diversity by PCR-RFLP assay. The assay amplifies a 743 bp fragment of the IBDV VP2 gene. The RFLP profiles of 40 of these positive samples were determined using the enzyme MboI. Most of the viruses had the same RFLP with the MboI enzyme. RFLP analysis of the isolates produced two different band profiles. The results of this study showed that li�le genetic heterogeneity exists among IBDV strains in a infected flock.