Fig. 4. Phylogenetic analysis of total 51 bacterial strains of Streptococcus species (S. parauberis, S. iniae, S. agalactiae, Lactococcus garvieae, S. dysgalactiae, and Vagococcus salmoninarum) causing streptococcal diseases based on 16S rDNA sequences from the NCBI database.

The evolutionary history was inferred using the Neighbor-Joining method. The optimal tree with the sum of branch length = 0.54759876 is shown. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (100 replicates) is shown next to the branches.