Abstract
To date, avian influenza viruses (AIVs) have persisted in domestic poultry in wet markets in East Asian countries. We have performed ongoing virus surveillance in poultry populations in Vietnam since 2011, with the goal of controlling avian influenza. Throughout this study, 110 H3 AIVs were isolated from 2760 swab samples of poultry in markets and duck farms. H3 hemagglutinin (HA) genes of the isolates were phylogenetically classified into eight groups (I–VIII). Genetic diversity was also observed in the other seven gene segments. Groups I–IV also included AIVs from wild waterbirds. The epidemic strains in poultry switched from groups I–III and VI to groups I, IV, V, and VIII around 2013. H3 AIVs in groups I and V were maintained in poultry until at least 2016, which likely accompanied their dissemination from the northern to the southern regions of Vietnam. Groups VI–VIII AIVs were antigenically distinct from the other groups. Some H3 AIV isolates had similar N6 neuraminidase and matrix genes as H5 highly pathogenic avian influenza viruses (HPAIVs). These results reveal that genetically and antigenically different H3 AIVs have been co-circulating in poultry in Vietnam. Poultry is usually reared outside in this country and is at risk of infection with wild waterbird-originating AIVs. In poultry flocks, the intruded H3 AIVs must have experienced antigenic drift/shift and genetic reassortment, which could contribute to the emergence of H5 HPAIVs with novel gene constellations.
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Acknowledgements
This was a collaborative research effort between the National Institute of Hygiene and Epidemiology (Vietnam), Nagasaki University (Japan), and Tottori University (Japan). This research was supported by AMED under Grant Number JP19fm0108001 (Japan Initiative for Global Research Network on Infectious Diseases (J-GRID)), and in part by a grant from MEXT for the Joint Research Program of the Research Center for Zoonosis Control, Hokkaido University, Japan.
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KS (first author) was responsible for the conception and design of the study, the acquisition, collation, and interpretation of the data, and the writing of the submitted article. MK was involved in the phylogenic/antigenic analyses and the animal infection experiment. KH, TTHU., and HLKN performed the virus surveillance and isolation study. HI, MQL, and TI (corresponding author) were involved in the coordination of the study, the import formality (Vietnam to Japan), and the submission process.
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Fig. S1 Phylogenetic trees of the N2 NA (A), N3 NA (B), N8 NA (C), PB2 (D), PB1 (E), PA (F), NP (G), and NS (H) gene segments of H3 AIV. The H3 virus isolates in our surveillance in Vietnam are shown in red. Wildfowl-originating viruses and H5 HPAIVs are shown in green and blue, respectively. The compressed taxa on the tree are shown by the italicized common denominators. The reference strains used for antigenic analysis in the present study are marked with filled circles. The partial sequences of each segment indicated in Table S1 were used for the analysis. Horizontal distances are proportional to the minimum number of nucleotide differences required to join the nodes and sequences. Numbers at the nodes indicate confidence levels in a bootstrap analysis with 1,000 replications. Bootstrap values of more than 60% are shown at each branch. The strains together with the virus isolates sharing a distinct common node [shown via asterisks (*)] were assumed to be within the same group.
Fig. S2 Alignment of the deduced H3 HA amino acid sequences of the strains used for antigenic analysis (H3 HA numbering). Group numbers are based on the H3 HA gene phylogeny (Fig. 1A). Amino acids constituting five antigenic sites (A—E) are boxed. Amino acid residues different from those in the group I LBM48 strain are shown in red.
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Soda, K., Kashiwabara, M., Miura, K. et al. Characterization of H3 subtype avian influenza viruses isolated from poultry in Vietnam. Virus Genes 56, 712–723 (2020). https://doi.org/10.1007/s11262-020-01797-7
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DOI: https://doi.org/10.1007/s11262-020-01797-7