Figure 1From: Genetic diversity of HA1 domain of heammaglutinin gene of influenza A(H1N1)pdm09 in TunisiaPhylogenetic relationship of partial length HA sequences of influenza A(H1N1)pdm09 viruses in Tunisia. The tree was rooted with the vaccine strain A/California/07/2009 (boxed) as outgroup. Branch lengths are drawn to scale. Signature amino acid changes (H1 numbering) are annotated at the nodes of each cluster.Back to article page