Information received on 29/12/2020 from Mr Knut Rønningen, Director, Norwegian Food Safety Authority, Ministry of Agriculture and Food, Brumunddal, Norway
Report type Follow-up report No. 8
Date of start of the event 20/06/2019
Date of confirmation of the event 10/07/2019
Report date 29/12/2020
Date submitted to OIE 29/12/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 2009
Manifestation of disease Sub-clinical infection
Causal agent Maedi-visna virus
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (11/07/2019)
Follow-up report No. 1 (06/09/2019)
Follow-up report No. 2 (30/10/2019)
Follow-up report No. 3 (29/11/2019)
Follow-up report No. 4 (31/12/2019)
Follow-up report No. 5 (31/01/2020)
Follow-up report No. 6 (29/02/2020)
Follow-up report No. 7 (08/04/2020)
Follow-up report No. 8 (29/12/2020)
New outbreaks (1)
Outbreak 1 Steinkjer, K, Innherred and Fosen Departement, Central Region, Nord-Trondelag
Date of start of the outbreak 10/07/2019
Outbreak status Resolved (07/11/2020)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Sheep 220
Affected population The holding was in quarantine because of possible contact on pasture with a holding with diagnosed maedi-visna.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Sheep 220 **
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Sheep ** ** ** **
*Removed from the susceptible population through death, destruction and/or slaughter
**Not calculated because of missing information
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Control measures
Measures applied
  • Movement control inside the country
  • Surveillance within containment and/or protection zone
  • Traceability
  • Quarantine
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Selective killing and disposal
  • Slaughter
  • Ante and post-mortem inspections
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations