Abstract
The surface proteins of Babesia rodhaini have previously been shown to induce a high degree of protective immunity. In the present study, one of those proteins, B. rodhaini antigen p26 was expressed in Escherichia coli and in insect cells infected with a recombinant baculovirus. These proteins were recognized by immune serum from a drug-cured BALB/c mouse. While BALB/c mice immunized with both recombinant antigens and Freund's adjuvants showed 40-100% survival rate against challenge infection with B. rodhaini, saponin failed to induce protection, although significant levels of B. rodhaini-specific antibodies were produced in both immunized mice (1:1,000-2,000 by indirect immunofluorescent antibody test). The immunization of IFN-gamma-deficient mice with the recombinant proteins was not protective against B. rodhaini infection, indicating that IFN-gamma is one of the important factors for the survival against lethal B. rodhaini infection.
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