[Seroepidemiological studies on Babesia equi in horses from the State of Rio Grande do Sul determined by indirect immunoflourecence test and Elisa].

The research was conducted to investigate the prevalence of Babesia equi, a parasite that affects horses, in the northern region of the state of Rio Grande do Sul in Brazil, using two test methods – the ELISA and the indirect immunofluorescence antibody (IFA) test. No significant difference in infection rates was observed based on age, breed, or sex of the horses.

Research Methodology

• The study was performed on a sample size of 380 horses’ serum, which was predicated as statistically representative of the horse population in the area basing on a mathematical model.
• Two diagnostic tests were used to determine the presence of antibodies against Babesia equi: the ELISA (Enzyme-Linked Immunosorbent Assay) and the IFA (Indirect immunofluorescence antibody test).

Study Findings

• The prevalence of Babesia equi was revealed to be 31.6% via the ELISA test and 35.8% via the IFA test.
• When comparing the results of the two tests, the researchers found a concordance of 87% (indicated by a kappa index of 0.87), identifying an optimal match.
• About the factors of age, breed, and sex of the horses, these were not observed to significantly influence infection rates (with a statistical significance level of P < 0.05).

Conclusion and Implications

• The study’s results suggest that the northern region of Rio Grande do Sul is an unstable enzootic area for Babesia equi, meaning that outbreaks of the parasite may occur sporadically and unpredictably.
• This characteristic poses an economic risk, especially for susceptible horses from areas where Babesia equi is not enzootic or even those born in the studied region, due to potential Babesiosis outbreaks.
• Understanding the prevalence and potential risk areas for this parasite can support practicable measures such as disease monitoring and prevention efforts.