Epidemiological investigation of the re-emergence of infectious salmon anemia in Chile
Reports from surveillance activities were analyzed to determine the epidemiology of the re-emergence of infectious salmon anemia virus (ISAV) in Atlantic salmon farms in Chile. The epidemic and spatial and spatiotemporal patterns were described, taking into account commercial compartmentalization of...
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Language: | English |
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2023
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Online Access: | https://repositorio.uc.cl/handle/11534/66342 https://doi.org/10.3354/dao02040 |
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ftpunivcchile:oai:repositorio.uc.cl:11534/66342 2023-07-23T04:18:23+02:00 Epidemiological investigation of the re-emergence of infectious salmon anemia in Chile Mardones, Fernando O. 2023-01-16T16:27:15Z application/pdf https://repositorio.uc.cl/handle/11534/66342 https://doi.org/10.3354/dao02040 en eng 0177-5103 https://doi.org/10.3354/dao02040 https://repositorio.uc.cl/handle/11534/66342 doi:10.3354/dao02040 1616-1580 acceso abierto Artículo 2023 ftpunivcchile https://doi.org/10.3354/dao02040 2023-07-01T23:52:15Z Reports from surveillance activities were analyzed to determine the epidemiology of the re-emergence of infectious salmon anemia virus (ISAV) in Atlantic salmon farms in Chile. The epidemic and spatial and spatiotemporal patterns were described, taking into account commercial compartmentalization of the farms. During the 64 wk study period, 76 ISAV-infected salmon farms, representing 17 companies, were reported in 65% of the management geographic zones of the 10th region in southern Chile. Approximately 20% of the farms at risk became infected, with the incidence rate increasing slightly over time. Results from epidemic analyses and observed spatial and spatiotemporal patterns suggested an initial dispersal and subsequent clustering of cases around the index case (IC) in a propagated epidemic mode. Results suggested that delayed depopulation may have been a key factor in the spread and persistence of ISAV. Clustering of cases supported the assumption that passive transmission in seawater from ISAV-infected farms (proximity) is a critical factor in controlling disease. The re-emergence of ISAV in Chile has resulted in one of the largest ISAV epidemics reported in the world and this study generates new hypotheses and provides useful information for spatial disease control planning in salmon farming areas. Article in Journal/Newspaper Atlantic salmon Pontificia Universidad Católica de Chile: Repositorio UC Diseases of Aquatic Organisms 84 105 114 |
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Open Polar |
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Pontificia Universidad Católica de Chile: Repositorio UC |
op_collection_id |
ftpunivcchile |
language |
English |
description |
Reports from surveillance activities were analyzed to determine the epidemiology of the re-emergence of infectious salmon anemia virus (ISAV) in Atlantic salmon farms in Chile. The epidemic and spatial and spatiotemporal patterns were described, taking into account commercial compartmentalization of the farms. During the 64 wk study period, 76 ISAV-infected salmon farms, representing 17 companies, were reported in 65% of the management geographic zones of the 10th region in southern Chile. Approximately 20% of the farms at risk became infected, with the incidence rate increasing slightly over time. Results from epidemic analyses and observed spatial and spatiotemporal patterns suggested an initial dispersal and subsequent clustering of cases around the index case (IC) in a propagated epidemic mode. Results suggested that delayed depopulation may have been a key factor in the spread and persistence of ISAV. Clustering of cases supported the assumption that passive transmission in seawater from ISAV-infected farms (proximity) is a critical factor in controlling disease. The re-emergence of ISAV in Chile has resulted in one of the largest ISAV epidemics reported in the world and this study generates new hypotheses and provides useful information for spatial disease control planning in salmon farming areas. |
format |
Article in Journal/Newspaper |
author |
Mardones, Fernando O. |
spellingShingle |
Mardones, Fernando O. Epidemiological investigation of the re-emergence of infectious salmon anemia in Chile |
author_facet |
Mardones, Fernando O. |
author_sort |
Mardones, Fernando O. |
title |
Epidemiological investigation of the re-emergence of infectious salmon anemia in Chile |
title_short |
Epidemiological investigation of the re-emergence of infectious salmon anemia in Chile |
title_full |
Epidemiological investigation of the re-emergence of infectious salmon anemia in Chile |
title_fullStr |
Epidemiological investigation of the re-emergence of infectious salmon anemia in Chile |
title_full_unstemmed |
Epidemiological investigation of the re-emergence of infectious salmon anemia in Chile |
title_sort |
epidemiological investigation of the re-emergence of infectious salmon anemia in chile |
publishDate |
2023 |
url |
https://repositorio.uc.cl/handle/11534/66342 https://doi.org/10.3354/dao02040 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
0177-5103 https://doi.org/10.3354/dao02040 https://repositorio.uc.cl/handle/11534/66342 doi:10.3354/dao02040 1616-1580 |
op_rights |
acceso abierto |
op_doi |
https://doi.org/10.3354/dao02040 |
container_title |
Diseases of Aquatic Organisms |
container_volume |
84 |
container_start_page |
105 |
op_container_end_page |
114 |
_version_ |
1772180685321142272 |