Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Phylogenetic analysis of the hemagglutinin (HA) nucleotide sequences from influenza B Victoria-lineage 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).
