A review of molecular characterization of infectious bursal disease virus circulating in Thailand according to the newly unified genotypic classification scheme https://doi.org/10.12982/VIS.2026.047
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Abstract
Infectious bursal disease virus (IBDV) is one of the leading pathogens affecting the Thai poultry industry. However, there remains little information concerning the genetic characteristics of Thai IBDVs available to predict the current field strains of IBDV. This review attempted to summarize the genotypes of IBDV in Thailand based on the newly unified genotypic classification scheme. Phylogenetic analysis was performed by using the nucleotide sequences of Thai IBDV published in the GenBank database. The results demonstrated that two genogroups of segment A, including A1 (classical) and A3 (very virulent), and two genogroups of segment B, including B1 (classical-like) and B3 (early Australian-like), were circulating in Thailand. A combination analysis of both segments A and B suggested that two genotypes of IBDV could be found in Thailand, including genotype A1B1 and A3B3. At present, no variant of IBDV has been reported in Thailand. However, it has been found in several countries that share borders with Thailand. Consequently, the molecular surveillance of IBDV should be performed continuously.
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