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Genetic Diversity of the Hemagglutinin Genes of Influenza a Virus in Asian Swine Populations

1
National Institute of Animal Health, National Agriculture and Food Research Organization (NARO), Tsukuba 305-0856, Japan
2
MSD-Animal Health, 5831 AN Boxmeer, The Netherlands
*
Author to whom correspondence should be addressed.
Academic Editor: Jens H. Kuhn
Viruses 2022, 14(4), 747; https://doi.org/10.3390/v14040747
Received: 2 February 2022 / Revised: 29 March 2022 / Accepted: 31 March 2022 / Published: 1 April 2022
(This article belongs to the Section Animal Viruses)
Swine influenza (SI) is a major respiratory disease of swine; SI is due to the influenza A virus of swine (IAV-S), a highly contagious virus with zoonotic potential. The intensity of IAV-S surveillance varies among countries because it is not a reportable disease and causes limited mortality in swine. Although Asia accounts for half of all pig production worldwide, SI is not well managed in those countries. Rigorously managing SI on pig farms could markedly reduce the economic losses, the likelihood of novel reassortants among IAV-S, and the zoonotic IAV-S infections in humans. Vaccination of pigs is a key control measure for SI, but its efficacy relies on the optimal antigenic matching of vaccine strains with the viral strains circulating in the field. Here, we phylogenetically reviewed the genetic diversity of the hemagglutinin gene among IAVs-S that have circulated in Asia during the last decade. This analysis revealed the existence of country-specific clades in both the H1 and H3 subtypes and cross-border transmission of IAVs-S. Our findings underscore the importance of choosing vaccine antigens for each geographic region according to both genetic and antigenic analyses of the circulating IAV-S to effectively manage SI in Asia. View Full-Text
Keywords: pig; respiratory disease; phylogeny; vaccine pig; respiratory disease; phylogeny; vaccine
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MDPI and ACS Style

Saito, T.; Sakuma, S.; Mine, J.; Uchida, Y.; Hangalapura, B.N. Genetic Diversity of the Hemagglutinin Genes of Influenza a Virus in Asian Swine Populations. Viruses 2022, 14, 747. https://doi.org/10.3390/v14040747

AMA Style

Saito T, Sakuma S, Mine J, Uchida Y, Hangalapura BN. Genetic Diversity of the Hemagglutinin Genes of Influenza a Virus in Asian Swine Populations. Viruses. 2022; 14(4):747. https://doi.org/10.3390/v14040747

Chicago/Turabian Style

Saito, Takehiko, Saki Sakuma, Junki Mine, Yuko Uchida, and Basav N. Hangalapura. 2022. "Genetic Diversity of the Hemagglutinin Genes of Influenza a Virus in Asian Swine Populations" Viruses 14, no. 4: 747. https://doi.org/10.3390/v14040747

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