Fig. 1From: Debate on the compositions of influenza B in northern hemisphere seasonal influenza vaccinesPhylogenetic trees of HA and NA of the seasonal influenza viruses in 2017/2018 winter on the same evolutionary scale. a- f correspond to N2, H3, NA of influenza B virus, HA of influenza B virus, H1, N1, respectively. Branches labelled by black dots are sequences of recommended compositions in the 8 years (2010/2011–2017/2018) vaccinesBack to article page