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Phylogenetic tree based on nucleotide sequence comparisons of the vp2 gene, showing relationships between IPNV samples analyzed in this study (blue and green circles) and reference strains. Analysis was performed in the MEGA 11 program using the neighbor-joining method; confidence in tree construction was assessed using 1,000 bootstrap replicates. Bootstrap values greater than 50% are shown. The evolutionary distances were computed using the maximum composite likelihood method.
