Author affiliations: Mahidol University, Bangkok, Thailand (P. Puthavathana, K. Sangsiriwut, A. Korkusol, P. Pooruk, P. Auewarakul); Ministry of Public Health, Nonthaburi, Thailand (C. Pittayawanganon, D. Sutdan, R. Kitphati, P. Sawanpanyalert, K. Ungchusak); Ministry of Health, Vientiane, Laos (B. Phommasack, K. Bounlu)
Appendix Figure. Phylogenetic analysis of avian influenza viruses (H5N1). A) hemagglutinin genes and B) polymerase A genes. Pseudosampling = 1,000. Known genotype V viruses are indicated in red, and genotype Z viruses are indicated in blue. Numbers on the right in braces indicate clades and subclades. Scale bars indicate genetic distances between sequences of different taxa. HK, Hong Kong.
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