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Phylogenetic analysis of the HA nucleotide sequences from influenza B Yamagata-lineage clade 3 viruses isolated in Italy from 2010 to 2015. The phylogeny tree was generated by the neighbor-joining method with 1000 bootstrap replicates. Sicilian strains (blue color), Ligurian strains (red color), WHO recommended candidate vaccine (green color) and reference strains (black color, bold font).
