Transmissibility and other characteristics of HPAI in Indonesian village poultry
This study was designed to measure the transmissibility of Type A H5N1 highly pathogenic avian influenza (HPAI) in mixed populations of backyard and small-scale commercial chickens in Java. An approach adapted from infection tree reconstruction was used to trace affected chickens and households in...
| Autores principales: | , , , , , , , , , |
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| Formato: | Póster |
| Lenguaje: | Inglés |
| Publicado: |
International Society for Veterinary Epidemiology and Economics
2012
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| Acceso en línea: | https://hdl.handle.net/10568/27761 |
| _version_ | 1855521259664703488 |
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| author | Jost, Christine Bett, Bernard K. Poole, Elizabeth J. Azar, M. Murahman, J. Daju, D. McLaws, M. Schoonman, L. Unger, Fred Mariner, Jeffrey C. |
| author_browse | Azar, M. Bett, Bernard K. Daju, D. Jost, Christine Mariner, Jeffrey C. McLaws, M. Murahman, J. Poole, Elizabeth J. Schoonman, L. Unger, Fred |
| author_facet | Jost, Christine Bett, Bernard K. Poole, Elizabeth J. Azar, M. Murahman, J. Daju, D. McLaws, M. Schoonman, L. Unger, Fred Mariner, Jeffrey C. |
| author_sort | Jost, Christine |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | This study was designed to measure the transmissibility of Type A H5N1 highly pathogenic avian influenza
(HPAI) in mixed populations of backyard and small-scale commercial chickens in Java. An approach adapted
from infection tree reconstruction was used to trace affected chickens and households in neighborhoods
(RTs) in which HPAI had been diagnosed by Indonesia’s surveillance system. Of the 41 outbreaks studied, 15
were in RTs participating in a mass vaccination program. The study found that backyard chickens were free
range, visiting a mean 4.2 households. Commercial poultry were present within the village in nearly half of
the outbreaks, although they were affected in only 7.3%. The distance from the index to the closest unaffected
household was significantly greater than that from the index to the closest affected. Mean morbidity was
80.9±28.8%, mortality 77.6±27.7%, and case fatality 97.3±12.3%. There was significant risk for outbreaks
to occur in households where Muscovy ducks, non-commercial chickens, broilers and geese were kept, but
there was not a significant risk associated with keeping pigeons or ducks (Anatidae family not including
Muscovy). Introduction of new birds to a household flock was most frequently documented to have led to
the introduction of the disease to an RT, while contact between birds from different household flocks was
most frequently documented to have contributed to spread. Transmission between birds within flocks was
significantly higher than transmission between flocks, between birds within flocks in vaccinated areas was
significantly lower than in unvaccinated areas, and between flocks in vaccinated areas was significantly
lower than in unvaccinated areas. Our findings indicate that backyard poultry populations as they occur on
Java provide the necessary environment for indefinite HPAI transmission. |
| format | Poster |
| id | CGSpace27761 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | International Society for Veterinary Epidemiology and Economics |
| publisherStr | International Society for Veterinary Epidemiology and Economics |
| record_format | dspace |
| spelling | CGSpace277612023-10-16T14:04:16Z Transmissibility and other characteristics of HPAI in Indonesian village poultry Jost, Christine Bett, Bernard K. Poole, Elizabeth J. Azar, M. Murahman, J. Daju, D. McLaws, M. Schoonman, L. Unger, Fred Mariner, Jeffrey C. animal diseases zoonoses livestock health This study was designed to measure the transmissibility of Type A H5N1 highly pathogenic avian influenza (HPAI) in mixed populations of backyard and small-scale commercial chickens in Java. An approach adapted from infection tree reconstruction was used to trace affected chickens and households in neighborhoods (RTs) in which HPAI had been diagnosed by Indonesia’s surveillance system. Of the 41 outbreaks studied, 15 were in RTs participating in a mass vaccination program. The study found that backyard chickens were free range, visiting a mean 4.2 households. Commercial poultry were present within the village in nearly half of the outbreaks, although they were affected in only 7.3%. The distance from the index to the closest unaffected household was significantly greater than that from the index to the closest affected. Mean morbidity was 80.9±28.8%, mortality 77.6±27.7%, and case fatality 97.3±12.3%. There was significant risk for outbreaks to occur in households where Muscovy ducks, non-commercial chickens, broilers and geese were kept, but there was not a significant risk associated with keeping pigeons or ducks (Anatidae family not including Muscovy). Introduction of new birds to a household flock was most frequently documented to have led to the introduction of the disease to an RT, while contact between birds from different household flocks was most frequently documented to have contributed to spread. Transmission between birds within flocks was significantly higher than transmission between flocks, between birds within flocks in vaccinated areas was significantly lower than in unvaccinated areas, and between flocks in vaccinated areas was significantly lower than in unvaccinated areas. Our findings indicate that backyard poultry populations as they occur on Java provide the necessary environment for indefinite HPAI transmission. 2012-08-20 2013-03-16T16:55:54Z 2013-03-16T16:55:54Z Poster https://hdl.handle.net/10568/27761 en Limited Access International Society for Veterinary Epidemiology and Economics Jost, C., Bett, B., Poole, J., Azar, M., Murahman, J., Daju, D., McLaws, M., Schoonman, L., Unger, F. and Mariner, J. 2012. Transmissibility and other characteristics of HPAI in Indonesian village poultry. Poster presented at the 13th conference of the International Society for Veterinary Epidemiology and Economics, Maastricht, the Netherlands, 20-24 August 2012. |
| spellingShingle | animal diseases zoonoses livestock health Jost, Christine Bett, Bernard K. Poole, Elizabeth J. Azar, M. Murahman, J. Daju, D. McLaws, M. Schoonman, L. Unger, Fred Mariner, Jeffrey C. Transmissibility and other characteristics of HPAI in Indonesian village poultry |
| title | Transmissibility and other characteristics of HPAI in Indonesian village poultry |
| title_full | Transmissibility and other characteristics of HPAI in Indonesian village poultry |
| title_fullStr | Transmissibility and other characteristics of HPAI in Indonesian village poultry |
| title_full_unstemmed | Transmissibility and other characteristics of HPAI in Indonesian village poultry |
| title_short | Transmissibility and other characteristics of HPAI in Indonesian village poultry |
| title_sort | transmissibility and other characteristics of hpai in indonesian village poultry |
| topic | animal diseases zoonoses livestock health |
| url | https://hdl.handle.net/10568/27761 |
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