We determined the complete nucleotide sequence of an infectious bursal disease (IBD) virus (IBDV) isolate (designated KZC-104) from a confirmed IBD outbreak in Lusaka in 2004. The genome consisted of 3,074 and 2,651 nucleotides in the coding regions of segments A and B, respectively. Alignment of both nucleotide and deduced amino acid sequences and phylogenetic analysis revealed that the genome segment A of KZC-104 was derived from a very virulent (VV) strain, whereas its segment B was derived from a classical attenuated strain. On BLAST search, the full-length segment A and B sequences showed 98 % nucleotide sequence identity to the VV strain D6948 and 99.8 % nucleotide sequence identity to the classical attenuated strain D78. This is a unique IBDV reassortant strain that has emerged in nature, involving segment B of a cell-culture-adapted attenuated vaccine.
Archives of Virology – Springer Journals
Published: Mar 1, 2013
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