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. 1987 Feb;55(2):364–368. doi: 10.1128/iai.55.2.364-368.1987

Protection of Babesia bigemina-immune animals against subsequent challenge with virulent Babesia bovis.

I G Wright, B V Goodger, G Leatch, J H Aylward, K Rode-Bramanis, D J Waltisbuhl
PMCID: PMC260335  PMID: 3542832

Abstract

Two groups of cattle, one previously exposed to Babesia bigemina and one not, were challenged with Babesia bovis. The group previously infected with Babesia bigemina was only mildly affected upon challenge with B. bovis, whereas four of five of the other group were severely affected. Immunoblotting studies performed in both homologous and heterologous systems showed that there were polypeptides of similar molecular weight in both species, but species-specific polypeptides were demonstrated only in B. bovis by the homologous B. bovis reaction. B. bovis antisera reacted avidly with B. bigemina-infected erythrocytes in fluorescent-antibody assays. In contrast, B. bigemina antisera did not cross-react with B. bovis-infected erythrocytes. Two groups of splenectomized calves were immunized with an enriched antigen fraction of B. bigemina. A third group was immunized by infection with B. bigemina and treatment with a drug. One of the groups of calves immunized with the antigenic fraction of B. bigemina, the group immunized by infection with B. bigemina, and a control group were challenged with B. bovis. All control calves died, whereas 50% of the calves immunized by infection with B. bigemina and 75% of the animals immunized with the B. bigemina antigen survived. The second group immunized with the B. bigemina antigen and a control group were challenged with B. bigemina. All control animals died by day 6, whereas 50% of the vaccinates survived, the deaths occurring on days 8 and 11. The nature of the probable protective mechanism is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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