[BVD (bovine virus diarrhea) and IBR (infectious bovine rhinotracheitis): serologic studies on 35 farms].
1099 female cattle from 35 farms in the provinces of North Brabant, Gelderland and Overijssel were examined for the presence of antibodies against Bovine Virus Diarrhoea (BVD) and Infectious Bovine Rhinotracheitis (IBR) by serum neutralisation tests. One of the farms examined was seronegative for BVD and 11 farms were seronegative for IBR. On the seropositive farms about 50% of cattle carrying their first calf had not experienced infection i.e. were seronegative (BVD 51.2%, IBR 48.3%). After calving the percentages of seronegative cows were considerably lower (BVD 19.6%, IBR 28.6%). The cause, implications, and prospects of prevention (vaccination) of the diseases are discussed.
D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D002417:Cattle / Q000276:immunology*; D001908:Diarrhea Viruses, Bovine Viral / Q000276:immunology*; D007242:Herpesvirus 1, Bovine / Q000276:immunology*; D009500:Neutralization Tests; D010576:Pestivirus / Q000276:immunology*
D000914:Antibodies, Viral
BVD en IBR: serologisch onderzoek op 35 bedrijven.