Maedi-visna,
Norway

Information received on 29/12/2020 from Mr Knut Rønningen, Director, Norwegian Food Safety Authority, Ministry of Agriculture and Food, Brumunddal, Norway

Summary

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

Epidemiology

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