1887

Abstract

The immunogenicity and protective efficacy of recombinant vaccinia viruses (rVV) encoding the F, G, N or M2 (22K) proteins of bovine respiratory syncytial virus (BRSV) were evaluated in calves, the natural host for BRSV. Calves were vaccinated either by scarification or intratracheally with rVV and challenged 6 to 7 weeks later with BRSV. Although replication of rVV expressing the F protein in the respiratory tract was limited after intratracheal vaccination, the levels of serum and pulmonary antibody were similar to those induced following scarification. The serum antibody response induced by the F protein was biased in favour of IgG1 antibody, whereas the G and the N proteins induced similar levels of IgG1:IgG2, and antibody was undetectable in calves primed with the M2 protein. The F protein induced neutralizing antibodies, but only low levels of complement-dependent neutralizing antibodies were induced by the G protein, and antibody induced by the N protein was not neutralizing. The F and N proteins primed calves for BRSV-specific lymphocyte proliferative responses, whereas proliferative responses were detected in calves primed with the G protein only after BRSV challenge. The M2 protein primed lymphocytes in only one out of five calves. Although there were differences in the immune responses induced by the rVVs, the F, G and N, but not the M2, proteins induced significant protection against BRSV infection and, in contrast with the enhanced lung pathology seen in mice vaccinated with rVV expressing individual proteins of human (H)RSV, there was a reduction in lung pathology in calves.

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1997-12-01
2024-04-16
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