[Use of the passive hemagglutination reaction to study Aujeszky's disease].

Experiments were carried out with the use of the passive hemagglutination test to study Aujeszky's disease, the antigen employed being the avirulent MK-35 strain of the disease virus. It was established that the passive hemmagglutination reaction could be referred to as a specific and rapid method in the study and diagnosis of the disease. Results showed that the vaccinal MK-35 strain was successfully used as an antigen in the test. In the treatment with an MK-25 vaccine there were predominantly antibodies detectable with the passive hemagglutination reaction.