Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link

Volume 32, Number 10—October 2026

Research

Molecular Epidemiology and Evolution of Swine Influenza A Viruses, Vietnam, 2020–2024

Ngoc Anh Bui1, Zoe Yi Song1, Samuel M.S. Cheng1, Duy Tung Dao, Lydia D.J. Chang, Gigi Y.Z. Liu, Quang Huy Nguyen, Thi Hang Dang, Quoc Hung Nguyen, Tom L.Y. Woo, Coco H.C. Chan, Tommy T.Y. Lam, Vuong N. Bui, and Malik PeirisComments to Author 
Author affiliation: Vietnam Institute of Animal and Veterinary Science, Hanoi, Vietnam (N.A. Bui, D.T. Dao, Quang H. Nguyen, T.H. Dang, Quoc H. Nguyen, V.N. Bui); The University of Hong Kong, Hong Kong, China (Z.Y. Song, S.M.S. Cheng, L.D.J Chang, G.Y.Z. Liu, T.L.Y. Woo, C.H.C. Chan, T.T.Y. Lam, M. Peiris).

Main Article

Figure 1

Duration of swine influenza clades circulated in Asia for H1 (A) and H3 (B) and clusters of each clade introduced into Vietnam (C) as part of study of molecular epidemiology and evolution of swine influenza A viruses, Vietnam, 2020–2024. In panels A and B, the dots indicate the sampling dates of the earliest viruses of each clade displayed, the vertical bars are the times of the latest samples, and the size of the dots represents the total number of samples of the clade in that location. In panel C, each bar starts from the time of the most recent common ancestor and the sampling time of the latest virus of each clade.

Figure 1. Duration of swine influenza clades circulated in Asia for H1 (A) and H3 (B) and clusters of each clade introduced into Vietnam (C) as part of study of molecular epidemiology and evolution of swine influenza A viruses, Vietnam, 2020–2024. In panels A and B, the dots indicate the sampling dates of the earliest viruses of each clade displayed, the vertical bars are the times of the latest samples, and the size of the dots represents the total number of samples of the clade in that location. In panel C, each bar starts from the time of the most recent common ancestor and the sampling time of the latest virus of each clade.

Main Article

1These first authors contributed equally to this article.

Page created: August 07, 2026
Page updated: September 28, 2026
Page reviewed: September 28, 2026
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
file_external