Detection of H5N1 High Pathogenicity Avian Influenza Viruses in Four Raptors and Two Geese in Japan in the Fall of 2022.
Viruses
; 15(9)2023 09 01.
Article
en En
| MEDLINE
| ID: mdl-37766272
ABSTRACT
In the fall of 2022, high pathogenicity avian influenza viruses (HPAIVs) were detected from raptors and geese in Japan, a month earlier than in past years, indicating a shift in detection patterns. In this study, we conducted a phylogenetic analysis on H5N1 HPAIVs detected from six wild birds during the 2022/2023 season to determine their genetic origins. Our findings revealed that these HPAIVs belong to the G2 group within clade 2.3.4.4b, with all isolates classified into three subgroups G2b, G2d, and G2c. The genetic background of the G2b virus (a peregrine falcon-derived strain) and G2d viruses (two raptors and two geese-derived strains) were the same as those detected in Japan in the 2021/2022 season. Since no HPAI cases were reported in Japan during the summer of 2022, it is probable that migratory birds reintroduced the G2b and G2d viruses. Conversely, the G2c virus (a raptor-derived strain) was first recognized in Japan in the fall of 2022. This strain might share a common ancestor with HPAIVs from Asia and West Siberia observed in the 2021/2022 season. The early migration of waterfowl to Japan in the fall of 2022 could have facilitated the early invasion of HPAIVs.
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Texto completo:
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Bases de datos:
MEDLINE
Asunto principal:
Virus de la Influenza A
/
Rapaces
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Subtipo H5N1 del Virus de la Influenza A
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Gripe Aviar
Tipo de estudio:
Diagnostic_studies
Límite:
Animals
País/Región como asunto:
Asia
Idioma:
En
Revista:
Viruses
Año:
2023
Tipo del documento:
Article
País de afiliación:
Japón