Phylogenetic characterization of infectious bursal disease (IBD)‎ viruses isolated from field outbreaks in chickens from behera and Alexandria governorates, Egypt

الملخص EN

Infectious bursal disease continues to be happened in Egypt causing a great economic losses in chickens.

thirty chicken flocks showing clinical signs suspected to be due to IBDV infection have been investigated from Behera and Alexandria governorates.

twelve flocks are confirmed to be infected with IBDV by RT/PCR showing a band of 620 bp on agar gel using a specific primer of VP2 gene of IBDV.

Eight positive PCR samples were chosen for further characterization by sequencing analysis.

Seven isolates were characterized as vvIBDV and one as classical IBDV.

the molecular characterization of isolated IBD field strains in the present study indicated a continuous circulation of vvIBDV although of intensive vaccination programs.