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Molecular Epidemiologic Evidence of Homologous Recombination in Infectious Bursal Disease Viruses

Important Findings A molecular epidemiologic study was conducted from 2001 to 2011 in commercial chickens (Gallus gallus) from Mexico, Colombia, and Venezuela. Although many infectious bursal disease viruses (IBDVs) were identified, most had the typical variant or classic amino acid sequences across the hypervariable (hv) region of VP2. However, within a virus, combinations of classic and variant amino acid sequence markers were detected that had not been identified previously in any IBDV strains. The data suggest that one or more recombination events may have occurred to create this type of sequence diversity. Because of importation regulations, immunologic studies could not be conducted in the United States to determine the antigenicity of the viruses examined in this study. The amino acid sequence data, however, suggest they would contain antigenic epitopes of both variant and classic IBDVs.