Infectious salmon anaemia,
Norway
Information received on 09/10/2014 from Dre Kristina Landsverk, Chief Veterinary Officer, Norwegian Food Safety Authority, Norwegian Food Safety Authority, Brumunddal, Norway
Summary
Report type Follow-up report No. 7
Date of start of the event 26/06/2013
Date of confirmation of the event 26/06/2013
Report date 09/10/2014
Date submitted to OIE 09/10/2014
Date event resolved 09/03/2015
Reason for notification First occurrence of a listed disease
Manifestation of disease Clinical disease
Causal agent Infectious salmon anaemia virus
Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced), Necropsy
This event pertains to a defined zone within the country
Related reports Immediate notification (27/06/2013)
Follow-up report No. 1 (01/07/2013)
Follow-up report No. 2 (28/02/2014)
Follow-up report No. 3 (09/05/2014)
Follow-up report No. 4 (28/05/2014)
Follow-up report No. 5 (07/07/2014)
Follow-up report No. 6 (10/07/2014)
Follow-up report No. 7 (09/10/2014)
Follow-up report No. 8 (10/02/2015)
Follow-up report No. 9 (26/06/2015)
New outbreaks (1)
Outbreak 1 (2014/7) Våtvika 13047, Vågan, Lofoten, Nordland
Date of start of the outbreak 03/10/2014
Outbreak status Resolved (09/03/2015)
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) 2 (scale 0 to 5) 2 (scale 0 to 5) 1500000 114100 114000 700000 0
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Atlantic salmon (Salmo salar) 1500000 114100 114000 700000 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Atlantic salmon (Salmo salar) 7.61% 7.60% 99.91% 54.27%
*Removed from the susceptible population through death, destruction and/or slaughter
Epidemiology
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 considers the ISA outbreak at Våtvika - 13047 likely to be a reoccurrence. The Norwegian Veterinary Institute uses genotyping to determine whether ISA outbreaks are an occurrence or a reoccurrence. Genetic characterization of ISAV segments 5 and 6 shows that the virus is closely related to viruses found in connection with previous outbreaks of ISA in Lofoten in 2013 and 2014. The previous outbreaks of ISA were located at a distance of about 50 km from Våtvika.
Control measures
Measures applied
  • Movement control inside the country
  • Emergency harvest
  • Traceability
  • Modified stamping out
  • Zoning
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Disinfection / Disinfestation
  • Traceability
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
Diagnostic test results
Laboratory name and type Species Test Test date Result
Norwegian Veterinary Institute (Regional Reference Laboratory) Atlantic Salmon (Salmo salar) histopathological examination Pending
Norwegian Veterinary Institute (Regional Reference Laboratory) Atlantic Salmon (Salmo salar) histopathological examination 03/10/2014 Positive
Norwegian Veterinary Institute (Regional Reference Laboratory) Atlantic Salmon (Salmo salar) immunohistochemical test 03/10/2014 Positive
Norwegian Veterinary Institute (Regional Reference Laboratory) Atlantic Salmon (Salmo salar) real-time PCR 03/10/2014 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations