[Studies of the CFT in the diagnosis of Aujeszky's disease virus in swine].

It was found that the complement-fixation test is a prompt and suitable method in the diagnosis of the Aujeszky's disease virus, the antigen employed being a cell culture virus. A virulent virus, a slightly virulent one, and the vaccinal mutant strain MK have shown a good complement-fixing activity and they detect specific complement-fixing antibodies in the immune serum. By means of cross CFT an antigenic relation has been established between some strains of the Herpes group and the Aujeszky's disease virus, it being predominantly unilatera. In Aujeszky's disease antisera neutralizing and complement fixing antibodies have been deomonstrated in titres up to 1:64, and in MK antisera--CF-antibodies only. In blood sera from farms with a moderate course in the manifestation of Aujeszky's disease the titre of the CF-antibodies has been 1:8.