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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Published in:Diseases of Aquatic Organisms
Main Author: Mardones, Fernando O.
Format: Article in Journal/Newspaper
Language:English
Published: 2023
Subjects:
Online Access:https://repositorio.uc.cl/handle/11534/66342
https://doi.org/10.3354/dao02040
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spelling 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
institution Open Polar
collection 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
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