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Bluetongue in Denmark during 2008.

L D Rasmussen¹, T B Rasmussen, G J Belsham

¹Division of Virology, National Veterinary Institute, Technical University of Denmark, Lindholm, 4771 Kalvehave, Denmark.

The Veterinary Record

|June 8, 2010

Summary

This summary is machine-generated.

Bluetongue virus serotype 8 (BTV-8) caused 15 outbreaks in Denmark in 2008, even with vaccination. Viral RNA persisted in a calf for three months post-infection.

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Area of Science:

Veterinary Virology
Epidemiology

Background:

Bluetongue virus (BTV) serotype 8 (BTV-8) emerged in Denmark in late 2007.
Subsequent outbreaks in 2008 occurred despite ongoing vaccination efforts in southern Denmark.

Purpose of the Study:

To investigate the epidemiology and virology of bluetongue outbreaks in Denmark during 2008.
To confirm the causative agent and its genetic relatedness to previously circulating strains.

Main Methods:

Outbreak identification through clinical suspicion and bulk milk surveillance.
Serological analysis using ELISA for antibodies.
Molecular detection of viral RNA using real-time RT-PCR.
Serotype confirmation and genetic sequencing of viral segment 2 (VP2).

Main Results:

Fifteen separate BTV outbreaks were identified in 2008.
All outbreaks were confirmed to be caused by BTV-8.
Vaccination zones were extended due to the spread of the virus.
A studied calf showed seroconversion but maintained viral RNA in blood for three months.
Sequencing confirmed the Danish BTV-8 strain was identical to the 2006 Dutch strain.

Conclusions:

BTV-8 continued to circulate and cause outbreaks in Denmark in 2008, necessitating expanded control measures.
The persistence of viral RNA in a naturally infected animal warrants further investigation.
The genetic identity to the 2006 Dutch strain suggests potential for long-range transmission or sustained circulation.