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Published on: June 9, 2011
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Schmallenberg Virus beyond Latitude 65°N.
E Chenais1, K Ståhl1, J Frössling1
1National Veterinary Institute, Uppsala, Sweden.
Transboundary and Emerging Diseases
|December 17, 2013
Summary
Schmallenberg virus (SBV) rapidly spread across Sweden in 2012, detected through milk surveys. High seroprevalence indicates widespread SBV circulation, with potential for future re-emergence in cattle.
Area of Science:
- Veterinary Virology
- Epidemiology
- Animal Health
Background:
- Schmallenberg virus (SBV) is an arbovirus affecting livestock.
- Understanding SBV's spread is crucial for disease management in animal populations.
Purpose of the Study:
- To investigate the extensive and rapid spread of Schmallenberg virus (SBV) in Sweden.
- To determine the seroprevalence and spatial distribution of SBV in cattle herds.
Main Methods:
- Consecutive serological bulk milk surveys conducted before and after the 2012 vector season.
- Analysis of SBV-specific antibodies in 723 randomly collected bulk milk samples nationwide.
- Confirmation of SBV circulation through detection in affected livestock.
Main Results:
- Prevalence increased from <0.2% of herds in spring 2012 to nearly 75% by autumn.
- SBV antibodies were detected nationwide, even above the 65th northern latitude.
- Evidence suggests multiple introductions and peak transmission between August and October 2012.
- Heterogeneous within-herd seroprevalence indicates remaining susceptible animal populations.
Conclusions:
- SBV experienced extensive and rapid spread throughout Sweden during the 2012 vector season.
- Multiple introductions and efficient transmission occurred, with potential for re-emergence.
- Ongoing surveillance is necessary to monitor SBV in Sweden.
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