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Volume 31, Number 2—February 2025
Research Letter

Human Infection with Avian Influenza A(H9N2) Virus, Vietnam, April 2024

Minh Hang DuongComments to Author , Thi Ngoc Uyen Phan, Trung Hieu Nguyen, Ngoc Hien Nhon Ho, Thu Ngoc Nguyen, Viet Thinh Nguyen, Minh Thang Cao, Chan Quang Luong, Vu Thuong Nguyen, and Vu Trung Nguyen
Author affiliation: Pasteur Institute in Ho Chi Minh City, Ho Chi Minh City, Vietnam

Main Article

Figure 2

Phylogenetic tree of the neuraminidase gene of human influenza A(H9N2) virus isolated in Vietnam (bold text) and reference sequences, constructed using the maximum-likelihood method and Tamura-Nei model. The bootstrap consensus tree inferred from 1,000 replicates represents the evolutionary history of the taxa analyzed. Branches corresponding to partitions reproduced in <50% bootstrap replicates are collapsed. We obtained initial trees for the heuristic search automatically by applying neighbor-joining and BioNJ algorithms to a matrix of pairwise distances estimated using the Tamura-Nei model and then selecting the topology with superior log likelihood value. This analysis involved 37 nt sequences; codon positions included were first + second + third + noncoding, for a total of 1,524 positions in the final dataset. Evolutionary analyses were conducted in MEGA 11 (https://www.megasoftware.net). Scale bar represents 0.8 nucleotide substitutions per site.

Figure 2. Phylogenetic tree of the neuraminidase gene of human influenza A(H9N2) virus isolated in Vietnam (bold text) and reference sequences, constructed using the maximum-likelihood method and Tamura-Nei model. The bootstrap consensus tree inferred from 1,000 replicates represents the evolutionary history of the taxa analyzed. Branches corresponding to partitions reproduced in <50% bootstrap replicates are collapsed. We obtained initial trees for the heuristic search automatically by applying neighbor-joining and BioNJ algorithms to a matrix of pairwise distances estimated using the Tamura-Nei model and then selecting the topology with superior log likelihood value. This analysis involved 37 nt sequences; codon positions included were first + second + third + noncoding, for a total of 1,524 positions in the final dataset. Evolutionary analyses were conducted in MEGA 11 (https://www.megasoftware.net). Scale bar represents 0.8 nucleotide substitutions per site.

Main Article

Page created: December 30, 2024
Page updated: January 31, 2025
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