[Viral carrier state and viral excretion in classical swine fever]

Studies on swine pest virus carrying and elimination on swine vaccinated by lapinizated vaccine strain "K" from rabbits were performed. Vaccinated swine were injected with the pathogenic virus on the 60th day post vaccination and to them were added not immunized swine with the aim to discover virus elimination. The experimental swine were decapitated on the 3, 5, 6 and 7th day post infection. Alternating passages were made by emulsion of the inner organs of these swine on not immunized swine as well as pathohistological investigation of the parenchymal organs and the brain. Presence of the virus and of pathohistological changes were not detected 7 days post injection of the virulent virus. Contact having swine which served as a indicator for virus elimination were observed for 21 days, but remained healthy. These swine, when infected with the virulent virus, suffered from pest.