Migration and Persistence of Human Influenza A Viruses, Vietnam, 2001–2008
Mai Quynh Le, Ha Minh Lam, Vuong Duc Cuong, Tommy Tsan-Yuk Lam, Rebecca A Halpin, David E Wentworth, Nguyen Tran Hien, Le Thi Thanh, Hoang Vu Mai Phuong, Peter Horby, and Maciej F. Boni
Author affiliations: National Institute for Hygiene and Epidemiology, Hanoi, Vietnam (M.Q. Le, V.D. Cuong, N.T. Hien, L.T. Thanh, H.V.M. Phuong); Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam (H.M. Lam, M.F. Boni); University of Edinburgh, Edinburgh, Scotland, UK (H.M. Lam); University of Oxford, Oxford, UK (T.T.-Y. Lam, P. Horby, M.F. Boni); The J. Craig Venter Institute, Rockville, Maryland, USA (R.A. Halpin, D. E. Wentworth); Oxford University Clinical Research Unit, Hanoi (P. Horby)
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Figure 1
![Maximum-likelihood phylogenetic tree (hemagglutinin segment) of the 787 sequences that comprise the regional influenza (H3N2) dataset. Tree is rooted on A/Canterbury/179/1999, and bootstrap values are shown on key nodes. Branches are colored by location: red, Vietnam; purple, Australia or New Zealand; green, Hong Kong; blue, Taiwan; orange, Singapore. Labels are shown directly to the left or right of the clades they are describing, with 2 exceptions: the label “VN Jun 2003–Jan 2004” refers to th](/eid/images/13-0349-F1.jpg)
Figure 1. . Maximum-likelihood phylogenetic tree (hemagglutinin segment) of the 787 sequences that comprise the regional influenza (H3N2) dataset. Tree is rooted on A/Canterbury/179/1999, and bootstrap values are shown on key nodes. Branches are colored by location: red, Vietnam; purple, Australia or New Zealand; green, Hong Kong; blue, Taiwan; orange, Singapore. Labels are shown directly to the left or right of the clades they are describing, with 2 exceptions: the label “VN Jun 2003–Jan 2004” refers to the viruses directly above it, and the label “ANZ 2000/2001” refers to the 2 major clades below it and above it. KG, Kyrgyzstan; VN, Vietnam; JP, Japan; KR, South Korea; QA, Qatar; KW, Kuwait; TW, Taiwan; HK, Hong Kong; ANZ, Australia and New Zealand. Scale bar indicates nucleotide substitutions per site.
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