[Peculiarities of immunological response to the administration of Vi-antigen in patients suffering from typhoid fever and in experimental animals].

Vi-antigen parenterally administered into the organism could be revealed on erythrocytes with the aid of inhibition of erythrocyte sedimentation reaction with immune Vi-serum. Patients with typhoid fever displayed positive results in 53.8% of cases. There were differences in the incidence of detection of the Vi-antigen in August and Wistar rats conditioned by theigenotype and due to the different capacity of their erythrocytes to sorb this antigen. Peculiarities of immunological response to the Vi-antigen administration depended on its sorption by erythrocytes in the organism and were the same in patients with typhoid fever and in the linear animals. A decreased capacity of erythrocyte to sorb Vi-antigen induced its more rapid elimination from the organism and caused a weak production of specific antibodies; this should be taken into consideration in immunotherapy of typhoid fever.