Comparative serologic study of equine piroplasmosis, with card and complement-fixation tests.

The research involved the creation and testing of a rapid card test for equine piroplasmosis, an infectious blood disease in horses, using an agglutinating antigen made from a parasite that causes the disease. The test was found to be largely accurate in correctly identifying infected and normal horses in both domestic and international settings.

Development of Diagnostic Test

• The researchers developed an agglutinating antigen and a rapid card test (CT) for equine piroplasmosis, a disease caused by the protozoan parasites Babesia caballi and Theileria equi.
• The antigen for the CT was prepared from lyophilized (freeze-dried) B. caballi complement-fixation (CF) antigen.

Samples Collection

• Serum and plasma samples were obtained from horses known to be infected with B. caballi and clinically normal horses maintained in a laboratory.
• Additionally, serum samples were also collected from horses living outside the continental United States, specifically in regions where piroplasmosis is endemic (regularly found and spread among the local populace).

Comparative Testing and Results

• These samples were all subjected to both the CT and CF diagnostic tests for comparative analysis.
• The CT successfully identified 85% of 192 plasma samples and 92% of 188 serum samples from the infected and healthy horses.
• There was a significant agreement between the results given by the CT and CF tests. This correlation was observed both in the samples collected domestically and from abroad.
• Specifically, for serum samples from horses outside the United States, 90% of 19 CF-positive samples were also CT-positive, and 92% of 177 CF-negative samples were also CT-negative, demonstrating a high level of consistency between the two testing methods.

Conclusion

• The researchers concluded that the newly developed CT for equine piroplasmosis demonstrated significant alignment with the existing CF method in accurately diagnosing the disease among various samples.
• This development could potentially contribute to faster and more efficient identification and management of equine piroplasmosis both in the United States and overseas.