| Abstract: | Eight of ten sows of the Large White breed were vaccinated in different stages of pregnancy, with an inactivated vaccine against Aujeszky's disease. The other two sows remained untreated. Two virulent strains of the Aujeszky's disease virus were used for the infection of all sows, either orally or intravenously. Neither of the two ways of infection led to the transmission of the virus to the foetus in any of the eight vaccinated sows. On the other hand, in the two unvaccinated sows, the virus was transmitted to the foetus only after intravenous infection, whereas oral infection did not lead to the transmission of the virus to the foetus. |
