Infectious salmon anaemia,
Information received on 30/05/2013 from Dr Keren Bar-Yaacov, Chief Veterinary Officer, Legislation, Norwegian Food Safety Authority, BRUMUNDDAL, Norway
Report type Immediate notification
Date of start of the event 28/05/2013
Date of confirmation of the event 29/05/2013
Report date 30/05/2013
Date submitted to OIE 30/05/2013
Date event resolved 03/06/2013
Reason for notification First occurrence of a listed disease
Manifestation of disease Clinical disease
Causal agent Infectious salmon anaemia virus
Nature of diagnosis Suspicion, Clinical, Laboratory (advanced), Necropsy
This event pertains to a defined zone within the country
Related reports Immediate notification (30/05/2013)
Follow-up report No. 1 (27/06/2013)
New outbreaks (1)
Outbreak 1 (2013/4) 32957, Sandnessjøen, Helgeland, Nordland
Date of start of the outbreak 28/05/2013
Outbreak status Resolved (03/06/2013)
Epidemiological unit Farm
Water type Salt water
Population type Farmed
Production system Semi-open
Affected animals
Species Morbidity Mortality Susceptible Cases Deaths Killed and disposed of Slaughtered
Atlantic salmon (Salmo salar) 3 (scale 0 to 5) 3 (scale 0 to 5) 385000 5000 3000 382000 0
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Atlantic salmon (Salmo salar) 385000 5000 3000 382000 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Atlantic salmon (Salmo salar) 1.30% 0.78% 60.00% 100.00%
*Removed from the susceptible population through death, destruction and/or slaughter
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments From an epidemiological point of view, the Norwegian Food Safety Authority (NFSA) considers the ISA outbreak in Sandnessjøen a first occurrence in this geographical area. Infectious salmon anaemia (ISA) was already present in Nordland in February and April 2013. However, at that time the disease did not affect the same area in which this notified outbreak has occurred. Therefore the NFSA assumes the currently reported outbreak is not a reoccurrence of ISA disease. The previous occurrences of ISA outbreaks took place in a quite different area within Nordland, with a distance of more than 250 km from other ISA-outbreaks. The ISA cases are separate outbreaks without any epidemiological correlation, although the previous occurrences of the disease belong to the same administrative region, Nordland, which is an extensive region.
Control measures
Measures applied
  • Movement control inside the country
  • Traceability
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Traceability
  • Surveillance outside containment and/or protection zone
  • Modified stamping out
  • Official disposal of carcasses, by-products and waste
  • Surveillance within containment and/or protection zone
Diagnostic test results
Laboratory name and type Species Test Test date Result
Norwegian Veterinary Institute (National laboratory) Atlantic salmon (Salmo salar) histopathological examination 28/05/2013 Positive
Norwegian Veterinary Institute (National laboratory) Atlantic salmon (Salmo salar) immunohistochemical test 28/05/2013 Positive
Norwegian Veterinary Institute (National laboratory) Atlantic salmon (Salmo salar) reverse transcription - polymerase chain reaction (RT-PCR) 29/05/2013 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations