title: Bovine viral diarrhea virus type 1- and type 2-specific bovine T lymphocyte-subset responses following modified-live virus vaccination.
abstract: Expression of CD25 (interleukin-2 receptor alpha chain) was used to monitor antigen-specific activation of T lymphocyte subsets (CD4+, CD8+, and gamma delta T cells) from cattle immunized with modified-live virus (MLV) bovine viral diarrhea virus (BVDV) vaccines. Two groups of 15 animals each were vaccinated with one dose of either BVDV genotype 1 (BVDV-1) or BVDV-1 and BVDV genotype 2 (BVDV-1/2). Six animals negative for both BVDV antibody and BVDV virus were used as negative controls. Three animals vaccinated 7 and 5 weeks before the start of the experiment with MLV BVDV-1 vaccine served as positive controls. Blood samples were taken from the negative control group, the positive control group, and the BVDV-1/2 group 0, 21, 35, 60, and 90 days after vaccination. Blood samples were taken from the BVDV-1 group 0, 21, and 90 days after vaccination. Isolated peripheral blood lymphocytes from immunized and control animals were incubated for 5 days with and without BVDV-1 or BVDV-2. Compared with nonvaccinated animals, a significant (P <.05) increase in expression of CD25 by CD4+ (60 days), CD8+, and gammadelta T (35 to 90 days) lymphocytes from the group given BVDV-1/2 was detected following in vitro exposure to BVDV-1 or BVDV-2 after vaccination. The CD8+ and gammadelta T cells from the group vaccinated with BVDV-1 had significantly (P <.05) increased expression of CD25 compared with nonvaccinates following postvaccination exposure to in vitro BVDV-1 but not to BVDV-2. There was no significant difference between the two vaccinated groups in CD25 expression on any of the T cell subsets in response to BVDV-1 or BVDV-2 exposure. A single administration of MLV BVDV vaccine may be more effective at stimulating CD8+ and gammadelta T cell-specific immune responses to the homologous genotype than to the heterologous genotype.
authors.affiliation: Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA.
authors.forename: Janice J
authors.initials: JJ
authors.lastname: Endsley
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Quade
authors.forename: Brett
authors.initials: B
authors.lastname: Terhaar
authors.forename: James A
authors.initials: JA
authors.lastname: Roth
mesh_terms: D000818:Animals; D001912:Bovine Virus Diarrhea-Mucosal Disease / Q000276:immunology / Q000517:prevention & control*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002417:Cattle; D030241:Diarrhea Virus 1, Bovine Viral / Q000276:immunology*; D030242:Diarrhea Virus 2, Bovine Viral / Q000276:immunology*; D008297:Male; D016176:T-Lymphocyte Subsets / Q000276:immunology; D014611:Vaccination / Q000662:veterinary; D014765:Viral Vaccines / Q000276:immunology*
chemical_list: D014765:Viral Vaccines