Induction of Anti-Theileria sergenti Antibodies in Calves with Murine Monoclonal Anti-Idiotype Antibody

Anti-idiotype (anti-Id) antibody that contains an internal image of Theileria sergenti (T. sergenti) merozoite surface antigen was intramuscularly inoculated to calves to induce anti- T. sergenti antibody. In immunized calves, anti-anti-Id antibodies were induced and these antibodies bound to merozoites of T. sergenti were confirmed by immunofluorescence assay (IFA) and enzyme-linked immunosorbent assay (ELISA). In this experiment, one calf with the highest antibody titer against anti-Id antibody was intravenously challenged with T. sergenti-infected erythrocytes to show insufficient potective effects of the anti-anti-Id antibodies against the challenge.