The complete genome sequence of a Chinese very virulent infectious bursal disease virus (vvIBDV) strain, Harbin-1, was determined.
Based on the sequence analysis, the molecular characteristics and potential virulence determinants and origin of vvIBDV strains
were identified. Phylogenetic analysis indicated that a reassortment and/or recombination event may have occurred in the emergence
of Chinese vvIBDV strains.