Differentiation of Babesia bigemina, B. bovis, B. divergens and B. major by Western blotting?first report of B. bovis in Austrian cattle

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Abstract
To establish an assay for the serological differentiation of bovine Babesia species (B. bigemina, B. bovis, B. divergens and B. major), antigens from experimentally infected cattle were Western blotted and probed with homologous and heterologous sera. Varying antigen patterns for each species allowed the determination of species-specific diagnostic antigens. Blood samples from 36 naturally infected cattle from the province of Styria were tested by indirect immunofluorescence antibody test (IFAT) against B. divergens, as well as by Western blotting against B. bigemina, B. bovis, B. divergens and B. major, 3 weeks after clinical babesiosis was diagnosed by blood smears. All 36 cattle were B. divergens-positive when tested by IFAT. In four cases (11%), an infection with both B. bovis and B. divergens and in two cases a single infection with B. bovis were diagnosed when tested by Western blot. B. bigemina and B. major infections were not detected. These are the first serologically confirmed cases of B. bovis in Austrian cattle.

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