[Immune reactions to the African swine fever virus].

Host immune reactions to African swine fever virus variants differing in their virulence were studied comparatively. Their obvious variabilities in antibody induction to some polypeptides active in antibody-dependent cell cytotoxicity and cytotoxic T-lymphocytes were demonstrated. T-helpers of immune pig splenocytes were found to recognize the cells infected with avirulent but not virulent virus variants. The described differences were not connected with the changes in SLA-1 antigen expression in the infected cells but correlated with induction of host resistance, chronic or acute course of the disease with fatal outcome.