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Rooted phylogenies of H3 hemagglutinin (A), N2 neuraminidase (B), H1 hemagglutinin (C), and N1 neuraminidase (D) gene sequences obtained from influenza viruses isolated between 2005 and 2008 in Cambodia. Cambodian isolates harboring a mutation H275Y on the NA protein are shaded. Cambodian isolates sequenced in 2005, 2006, 2007, and 2008 were labeled with triangles, circles, squares, and diamonds, respectively. The vaccine reference strains are boxed.
