Resumo

MARGINEDA, C.A. et al. Estudio de la respuesta inmune frente a la vacunación con virus respiratorio sincitial bovino (VRSB) inactivado en bovinos. Evaluación de la inmunidad pasiva. RIA. Rev. investig. agropecu. [online]. 2019, vol.45, n.1, pp.81-87. ISSN 1669-2314.

The aim of this work was to evaluate the titer and duration of neutralizing antibodies in cows immunized with an inactivated experimental vaccine for BRSV and the levels and duration of anti-BRSV maternal antibodies in calves born. A group of six pregnant cows was inoculated with a inactivated BRSV vaccine, at 90 and 60 days before calving. As a control group, six animals were mock inoculated. Cows´ serum samples were obtained at days 90, 60, 30 before calving and at 0, 60 and 120 days postpartum. Sera from calves were obtained at 48-72 hours postpartum, 30, 60, 90 and 120 days after birth. The kinetic of serum specific antibodies from inoculated animals and newborn calves was analyzed by a serum neutralization assay. Only the vaccinated cows serocoverted 60 days post booster and antibody titers remained high 180 days post booster. Six newborn calves showed an effective passive transfer of specific BRSV maternal antibodies. In this work, it was possible to determine antibody levels against BRSV and their duration after vaccination of cows and calves born using an inactivated vaccine.

Palavras-chave : Vaccine; bovine respiratory syncytial virus; passive immunity.