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The Threat of Pandemic Influenza: Are We Ready? Workshop Summary (2005)
Board on Global Health (BGH)

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79
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The Threat of Pandemic Influenza: Are We Ready? - Workshop Summary

FIGURE 1-4 Phylogenetic tree of the influenza virus hemagglutinin gene segment. Amino acid changes in three lineages of the influenza virus hemagglutinin protein segment, HA1. The tree shows the numbers of unambiguous changes between these sequences, with branch lengths being proportional to number of changes.

SOURCE: Reid et al. (1999).

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79
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