Abstract
In this paper recent progress concerning the identification of soluble antigens from cultures of Babesia bovis parasites is reviewed. Soluble antigens present in the supernatant of B. bovis cultures have been shown to be efficient immunogens for induction of protective immunity against bovine babesiosis. Immunochemical analysis of culture supernatants has demonstrated that at least 3 parasite antigens are released in vitro. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that at least 2 of these antigens have molecular weights within the range of 37 000–40 000 daltons. Crossed immunoelectrophoretic studies have further revealed an antigenic spectrum consisting of 1 major and 2 minor antigens with mobilities in the albumin and alpha 1 region. Within the infected erythrocyte, 2 antigens have been localized on or near the erythrocytic membrane, while the third antigen appears to be directly associated with the parasite.
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