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A case-control study on scrapie in Norwegian sheep flocks.
1Section of Epidemiology, National Veterinary Institute, P.O. Box 8156 Dep., N-0033 Oslo, Norway. petter.hopp@vetinst.no
Preventive Veterinary Medicine
|September 6, 2001
Summary
Scrapie risk in Norwegian sheep flocks increases with purchasing sheep from infected flocks and sharing resources like pastures. Farmer awareness and management practices also influence scrapie detection and spread.
Area of Science:
- Veterinary Epidemiology
- Animal Health
- Disease Transmission
Background:
- Scrapie cases increased in Norwegian sheep flocks between 1995-1997, primarily in one region.
- Identifying risk factors is crucial for controlling scrapie outbreaks.
Purpose of the Study:
- To identify risk factors associated with scrapie occurrence in Norwegian sheep flocks.
- To understand factors influencing scrapie spread and detection.
Main Methods:
- A case-control study involving 176 sheep flocks (42 with scrapie).
- Data collected via questionnaires and linked to governmental/industry registers.
- Multivariable conditional logistic regression analysis after data imputation.
Main Results:
- Purchasing female sheep from scrapie-positive flocks, sharing rams, and shared pastures were significant risk factors.
- Increased flock size, winter-fed sheep, housing, and shared mating areas correlated with scrapie.
- Farmer awareness and veterinary engagement were linked to scrapie detection.
Conclusions:
- Sheep transfer and direct contact between flocks are key drivers of scrapie spread.
- Management factors play a role, but specific management strategies require further investigation.
- Farmer awareness influences scrapie detection rates.