Infectious salmon anaemia,
Norway
Information received on 13/03/2014 from Dre Kristina Landsverk, Chief Veterinary Officer, Norwegian Food Safety Authority, Norwegian Food Safety Authority, Brumunddal, Norway
Summary
Report type Immediate notification
Date of start of the event 07/03/2014
Date of confirmation of the event 07/03/2014
Report date 13/03/2014
Date submitted to OIE 13/03/2014
Date event resolved 15/04/2014
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 (advanced), Necropsy
This event pertains to a defined zone within the country
Related reports Immediate notification (13/03/2014)
Follow-up report No. 1 (13/05/2014)
New outbreaks (1)
Outbreak 1 (2014/3) Hjellberget 10808, Nord Troms, KvŠnangen, Troms
Date of start of the outbreak 07/03/2014
Outbreak status Resolved (15/04/2014)
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) 714585 2000 1500 500 638255
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Atlantic salmon (Salmo salar) 714585 2000 1500 500 638255
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Atlantic salmon (Salmo salar) 0.28% 0.21% 75.00% 89.60%
*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 this infectious salmon anaemia (ISA) outbreak at Hjellberget to be a first occurrence. The Norwegian Veterinary Institute use genotyping to determine whether ISA outbreaks are an occurrence or a reoccurrence. Infectious salmon anaemia was present at another location about 30 km away in May 2013 as well. The ISA cases seem to be two separate outbreaks without any epidemiological correlation, although both of them belong to the same administrative region, Troms. The virus relating to the outbreak will be further characterized associated with the epidemiological studies.
Control measures
Measures applied
  • Movement control inside the country
  • Modified stamping out
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Disinfection / Disinfestation
  • Emergency harvest
  • Traceability
  • Traceability
  • Surveillance outside containment and/or protection zone
  • Official destruction of animal products
  • Surveillance within containment and/or protection zone
  • Zoning
Diagnostic test results
Laboratory name and type Species Test Test date Result
Norwegian Veterinary Institute (Regional Reference Laboratory) Atlantic salmon (Salmo salar) histopathological examination 07/03/2014 Positive
Norwegian Veterinary Institute (Regional Reference Laboratory) Atlantic salmon (Salmo salar) immunohistochemical test 07/03/2014 Positive
Norwegian Veterinary Institute (Regional Reference Laboratory) Atlantic salmon (Salmo salar) real-time PCR 07/03/2014 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations