Epidemiologic investigation of the re-emergence of infectious salmon anemia virus in Chile

Fernando O. Mardones, Andrés M. Perez, Tim Carpenter

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)105-114
Number of pages10
JournalDiseases of Aquatic Organisms
Issue number2
StatePublished - May 25 2009


  • Atlantic salmon
  • Chile
  • Infectious salmon anemia
  • ISAV
  • Salmo salar
  • Spatial epidemiology

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics


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