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. 2021 May 24;12:661379. doi: 10.3389/fimmu.2021.661379

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Copyright © 2021 Ferrara, Del Rosario, da Costa, Kinsley, Scott, Fereidouni, Thompson, Kellam, Gilbert, Carnell and Temperton

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Phylogenetic tree of influenza B HA used for pseudotype production. Phylogenetic tree shows influenza B diverging into two distinct lineages, B/Yamagata (blue) and B/Victoria (red). Accession numbers are reported with the strain name on the tree tips. Nodes are shown at the ends of branches which represent sequences or hypothetical sequences at various points in evolutionary history. Branch lengths indicate the extent of genetic change. The tree generated was constructed with PhyML (48) and graphically elaborated with Archaeopteryx.js (https://sites.google.com/site/cmzmasek/home/software/archaeopteryx-js).