Article ; Online: H5Nx Viruses Emerged during the Suppression of H5N1 Virus Populations in Poultry.
2021 Volume 9, Issue 2, Page(s) e0130921
Abstract: Highly pathogenic avian influenza (HPAI) H5 viruses have posed a substantial pandemic threat through repeated human infection since their emergence in China in 1996. Nationwide control measures, including vaccination of poultry, were implemented in 2005, ...
Abstract | Highly pathogenic avian influenza (HPAI) H5 viruses have posed a substantial pandemic threat through repeated human infection since their emergence in China in 1996. Nationwide control measures, including vaccination of poultry, were implemented in 2005, leading to a sharp reduction in H5N1 virus outbreaks. In 2008, novel non-N1 subtype (H5Nx) viruses emerged, gradually replacing the dominant H5N1 subtype and causing global outbreaks. The cause of this major shift in the ecology of HPAI H5 viruses remains unknown. Here, we show that major H5N1 virus lineages underwent population bottlenecks in 2006, followed by a recovery in virus populations between 2007 and 2009. Our analyses indicate that control measures, not competition from H5Nx viruses, were responsible for the H5N1 decline, with an H5N1 lineage capable of infecting poultry and wild birds experiencing a less severe population bottleneck due to circulation in unaffected wild birds. We show that H5Nx viruses emerged during the successful suppression of H5N1 virus populations in poultry, providing an opportunity for antigenically distinct H5Nx viruses to propagate. Avian influenza vaccination programs would benefit from universal vaccines targeting a wider diversity of influenza viruses to prevent the emergence of novel subtypes. |
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MeSH term(s) | Animals ; Animals, Wild/virology ; Birds/virology ; Chickens/virology ; China ; Ducks/virology ; Geese/virology ; Influenza A Virus, H5N1 Subtype/genetics ; Influenza A Virus, H5N1 Subtype/physiology ; Influenza A virus/classification ; Influenza A virus/genetics ; Influenza A virus/isolation & purification ; Influenza A virus/physiology ; Influenza in Birds/epidemiology ; Influenza in Birds/virology ; Phylogeny ; Poultry Diseases/epidemiology ; Poultry Diseases/virology |
Language | English |
Publishing date | 2021-09-29 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't |
ZDB-ID | 2807133-5 |
ISSN | 2165-0497 ; 2165-0497 |
ISSN (online) | 2165-0497 |
ISSN | 2165-0497 |
DOI | 10.1128/Spectrum.01309-21 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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