C-Terminal region of 48-kDa rhoptry protein for serological detection of Babesia caballi antibodies in horses.

The research revolves around the development of serological tests to diagnose Babesia caballi, a blood parasite in horses, using a C-terminal antigen created from a Babesia caballi-protein.

Creation of Recombinant Antigen

• The researchers created a recombinant C-terminal antigen derived from the 48-kDa rhoptry protein of Babesia caballi (rBc48/CT).
• The purpose of creating this antigen was to develop a serological diagnostic test. Serological tests aim to detect the presence of antibodies in the blood, which are generated by the immune system in response to an infection.

Antiserum Reactions

• The researchers also raised an antiserum against the rBc48/CT. They then studied how this antiserum reacted specifically with the corresponding native protein.
• This was accomplished using Western blotting, a method used to detect specific protein molecules from mixtures, and the indirect fluorescent antibody test (IFAT), a method used to detect specific antigens or antibodies in a sample.

Construction of Diagnostic Tests

• The researchers created two diagnostic tests based on the rBc48/CT— an indirect enzyme-linked immunosorbent assay (Bc48/CT-ELISA) and an immunochromatographic test (Bc48/CT-ICT).
• The aim of these tests was to detect an antibodies against Babesia caballi in a variety of equine sera.

Comparison with Reference Tests

• The researchers compared the results of the Bc48/CT-ELISA and Bc48/CT-ICT tests with those of IFAT and ELISA, which used the full-length protein of Bc48 as reference tests.
• The results of the Bc48/CT-ELISA and Bc48/CT-ICT tests were highly consistent with those of the reference tests.

Conclusion

• The study concluded that the the Bc48/CT antigen proved successful for the serological diagnosis of Babesia caballi infection in horses.

In simpler terms, the research shares the successful implementation of a derived antigen based test to diagnose a parasitic infection in horses. It highlights the consistent results with other reference tests and establishes the new findings as a credible and effective approach for serological diagnosis.