FIGURE 1-4. Phylogenetic tree of the influenza virus hemagglutinin gene segment.

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).

From: 1, The Story of Influenza

Cover of The Threat of Pandemic Influenza
The Threat of Pandemic Influenza: Are We Ready? Workshop Summary.
Institute of Medicine (US) Forum on Microbial Threats; Knobler SL, Mack A, Mahmoud A, et al., editors.
Washington (DC): National Academies Press (US); 2005.
Copyright © 2005, National Academy of Sciences.

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