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. 2015 Sep 8;144(4):751–767. doi: 10.1017/S0950268815001806

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© Cambridge University Press 2015

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 4. — Phylogenetic comparison of influenza B (Victoria lineage) HA genes. Vaccine virus is indicated in bold red font and reference viruses (those to which post-infection ferret antisera have been raised) are shown in bold black font. Coloured font is used to indicate the month of clinical specimen collection for viruses isolated covering April to August 2012. Isolates from National Influenza Centre, Argentina are boxed. The majority of sequences used in the phylogenetic analysis were generated by WHO CC, London (all available in GISAID), while others were downloaded from GISAID as indicated (e.g. cnic, cdc, aus). The scale bar indicates the proportion of nucleotide changes between sequences.