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Transmission Dynamics of Highly Pathogenic Avian Influenza A(H5N1) and A(H5N6) Viruses in Wild Birds, South Korea, 2023–2024
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Transmission Dynamics of Highly Pathogenic Avian Influenza A(H5N1) and A(H5N6) Viruses in Wild Birds, South Korea, 2023–2024
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Transmission Dynamics of Highly Pathogenic Avian Influenza A(H5N1) and A(H5N6) Viruses in Wild Birds, South Korea, 2023–2024
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Journal Article
Transmission Dynamics of Highly Pathogenic Avian Influenza A(H5N1) and A(H5N6) Viruses in Wild Birds, South Korea, 2023–2024
2025
Overview
We analyzed 15 cases of highly pathogenic avian influenza (HPAI) clade 2.3.4.4b virus infections detected in wild birds in South Korea during September 2023-March 2024. We isolated and sequenced 8 H5N1 and 7 H5N6 viruses. We investigated spatiotemporal transmission dynamics by using a Bayesian discrete trait phylodynamic model that incorporated geographic and host species information. Our source-sink dynamics support introductions of H5N1 viruses from northern Japan to South Korea and subsequent spread through multiple regions in South Korea. The H5N6 viruses were most likely introduced into southwestern South Korea and spread northeastward. Wild waterfowl, especially wild ducks, played a key role in transmission of both H5N1 and H5N6 viruses. Our data showed multiple introductions and extensive spread of HPAI clade 2.3.4.4b viruses and bidirectional transmission between Japan and South Korea. Our results highlight the value of enhanced active surveillance for monitoring HPAI viruses, which can provide insight into preventing future outbreaks.
Publisher
U.S. National Center for Infectious Diseases,Centers for Disease Control and Prevention
Subject
/ Datasets
/ Ducks
/ H5N1
/ H5N6
/ Highly pathogenic avian influenza virus
/ Identification and classification
/ Influenza A virus - classification
/ Influenza A virus - genetics
/ Influenza A Virus, H5N1 Subtype - classification
/ Influenza A Virus, H5N1 Subtype - genetics
/ Influenza A Virus, H5N1 Subtype - isolation & purification
/ Influenza in Birds - epidemiology
/ Influenza in Birds - history
/ Influenza in Birds - transmission
/ Influenza in Birds - virology
/ Poultry
/ Republic of Korea - epidemiology
/ Viruses
/ Wildfowl
