Bovine viral diarrhoea virus control in Finland 1998-2004.
The bovine viral diarrhoea virus (BVDV) situation among dairy herds and suckler-cow herds was monitored annually from 1998 to 2004. Bulk-tank milk (BTM) samples from all dairy herds and serum samples from beef animals at slaughter were examined for BVDV antibodies using a commercial indirect ELISA test. New BTM antibody-positive herds and herds with a history of BTM antibodies, but previously untested were sampled individually and tested for evidence of BVDV. The reason for the antibody-positivity or the source of infection was investigated. The percentage of BTM antibody-positive herds ranged from 0.45% in 2000 to 0.15% in 2003. The number of herds with persistently infected (PI) animals ranged from 10 in 2001 to 0 in 2003. The most common cause for a herd to become BTM antibody-positive was the purchase of a seropositive animal or a PI animal or a dam carrying a PI fetus. The new BVD decree of 2004 will be described in brief.
Rikula
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U
National Veterinary and Food Research Institute (EELA), Department of Virology, P.O. Box 45, FI-00581 Helsinki, Finland. ulla.rikula@eela.fi
Nuotio
L
L
Aaltonen
T
T
Ruoho
O
O
D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis / Q000097:blood; D001912:Bovine Virus Diarrhea-Mucosal Disease / Q000453:epidemiology / Q000276:immunology / Q000517:prevention & control* / Q000821:virology; D002417:Cattle; D005260:Female; D005387:Finland / Q000453:epidemiology; D008892:Milk / Q000737:chemistry; D011159:Population Surveillance; D013997:Time Factors
D000914:Antibodies, Viral