Wild birds in south china agro-ecosystems and long-distance spread of H5N1
Agricultural intensification in South China has increased densities of domestic ducks raised on intensively irrigated paddy fields, an important factor in the persistence of H5N1 highly pathogenic avian influenza virus (HPAIV). Some major wild bird congregating wetlands in South China have been partly turned into paddy fields where millions of free-grazing domestic ducks are raised. This may facilitate the contact and the circulation of avian influenza virus (AIV) between domestic and wild waterfowl, the latter a reservoir of AIV. In this study we combined epidemiological, ecological, agricultural and virological data to investigate the potential role of wild birds in the long-distance spread of H5N1 HPAIV virus from South China. We used new technologies such as satellite-tracking of wild birds, GPS tracking of domestic ducks, remote sensing of irrigated paddy fields, and phylogenetic analysis of H5N1 strains isolated in wild and domestic birds. Our results show that: (i) wild birds share paddy fields, wetlands and AIV strains with free-grazing domestic ducks when wintering in South China, (ii) spring migration of wild birds from South China match spatially and temporally with the longdistance spread of HPAIV H5N1, (iii) epidemiological and virological data support the role of wild birds in this long-distance spread. This study provides evidence of the role of wild birds in the long distance spread of H5N1 AIV from South China agro-ecosystems. It also raises the question of the role of wild birds in the evolution of low and highly pathogenic strains as they introduce new AIV strains in these agro-ecosystems.
Main Authors: | Cappelle, Julien, Zhao, Delong, Takekawa, John Y., Newman, Scott, Xiao, Xiangming |
---|---|
Format: | conference_item biblioteca |
Language: | eng |
Published: |
s.n.
|
Subjects: | L73 - Maladies des animaux, L20 - Écologie animale, |
Online Access: | http://agritrop.cirad.fr/573590/ http://agritrop.cirad.fr/573590/1/document_573590.pdf |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Spread of HPAIV H5N1 from south china agro-ecosystems through wild birds migration: a multidisciplinary approach
by: Cappelle, Julien, et al. -
A transdisciplinary study of the risk of transmission and spread of HPAIV H5N1 in Asian intensive agro-ecosystems
by: Cappelle, Julien, et al. -
Estimation of a dynamic indicator of indirect contact between wild birds and poultry based on remote sensing and satellite telemetry
by: Cappelle, Julien, et al. -
Potential dispersal range and rate of H5N1 HPAI virus by wild waterfowl: estimation from satellite-tracked bird movements
by: Cappelle, Julien, et al. -
Genetic evidence for a high diversity and wide distribution of endemic strains of the pathogenic chytrid fungus Batrachochytrium dendrobatidisin wild Asian amphibians
by: Bataille, Arnaud, et al.