e-journal
Genetic characterization of a betanodavirus isolated from a clinical disease outbreak in farm-raised tilapia Oreochromis niloticus (L.) in Thailand
Betanodavirus infection was diagnosed in larvae of farm-raised tilapia Oreochromis niloticus (L.), in
central Thailand. Extensive vacuolar degeneration and neuronal necrosis were observed in histological
sections with positive immunohistochemical staining for betanodavirus. Molecular phylogenetic
analysis was performed based on the nucleotide sequences (1333 bases) of the capsid protein gene.
The virus strain was highly homologous (93.07–93.88%) and closely related to red-spotted
grouper nervous necrosis virus (RGNNV).
Keywords: betanodavirus, farm-raised tilapia, Genetic characteristic, Thailand.
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