Protective effect of an ISCOM bovine virus diarrhoea virus (BVDV) vaccine against an experimental BVDV infection in vaccinated and non-vaccinated pregnant ewes.
Fifteen pregnant ewes were vaccinated twice with an experimental immunostimulating complex (ISCOM) subunit vaccine designed to contain the envelope proteins of a Danish cytopathic bovine virus diarrhoea virus (BVDV). The serological responses were measured in ELISA and virus neutralization (VN) tests. All ISCOM-vaccinated ewes developed high VN antibody titres to BVDV in contrast to the 14 non-vaccinated ewes. Both groups of ewes were challenged parenterally when 48-65 days pregnant with a Swedish cytopathic BVDV isolate. In the vaccinated group 26 fetuses out of 29 detected by ultrasound were liveborn, whereas only six out of 26 were liveborn in the non-vaccinated group. It is concluded that the ISCOM vaccine had the potential of eliciting high VN titres as well as protecting fetuses against transplacental infection after challenge with a virulent BVDV isolate.
Carlsson
U
U
Swedish University of Agricultural Sciences, Faculty of Veterinary Medicine, Department of Cattle and Sheep Diseases, Uppsala.
Alenius
S
S
Sundquist
B
B
D000818:Animals; D000914:Antibodies, Viral / Q000096:biosynthesis; D001912:Bovine Virus Diarrhea-Mucosal Disease / Q000517:prevention & control*; D002417:Cattle; D001908:Diarrhea Viruses, Bovine Viral / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D016882:ISCOMs; D009500:Neutralization Tests; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000517:prevention & control / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000517:prevention & control*; D014765:Viral Vaccines / Q000276:immunology*
D000914:Antibodies, Viral; D016882:ISCOMs; D014765:Viral Vaccines