Heterogeneity of Borrelia burgdorferi sensu lato and their reflection on immune response.

The study explored the differences in immune responses by horses in Eastern Slovakia to various strains of Borrelia burgdorferi sensu lato, a bacterium involved in Lyme disease. The results suggest that geographic proximity of the bacterial strains relates to a higher consistency of immune responses.

Study Overview

• The study focused on the variant strains of Borrelia burgdorferi sensu lato, a bacterium responsible for causing Lyme disease. Strains included were: B. burgdorferi sensu stricto Ir 105, B. burgdorferi s.s. + B. afzelii V 123, B. garinii Ir 112 (isolates from eastern Slovakia), B. garinii K24 (isolate from western Slovakia), and B. burgdorferi s.s. B 31 (an American strain).
• The strains were used as antigens in testing the immune response of a group of horses from eastern Slovakia through an IgG ELISA serological study.
• The sample consisted of serum samples from 101 horses. The immune response positivity rates varied with the use of different strains, ranging from 24.7% (for the B 31 strain) to 52.4% (for the Ir 105 strain).

Results and Findings

• Significant statistical differences were found in the seroprevalence between the strains B 31 (American) and the Slovak strains (Ir 105, V 123, Ir 112, and K 24). Meanwhile, the differences between the Slovak strains (Ir 105, V 123, Ir 112 and K24) were insignificant.
• The American strain demonstrated consistency in positive and negative findings between 50.5-62.4%, whereas the Slovak strains showed a higher consistency ranging from 79.2-95.04%.
• Among Slovak strains, the highest consistency of findings was between Ir 112 and K 24. Moreover, high consistency of results was also observed for strains Ir 105 and V 123 and Ir 112 and Ir 105.
• The study concluded that the geographic proximity of the bacterial strains appears to influence the consistency of immune responses, as indicated by a greater similarity in protein profiles of the Slovak strains compared to the American strain.

Conclusion

• The findings of the study underscore the potential role of geographical factors in the immune response to varying strains of Borrelia burgdorferi. The results observed in horses from eastern Slovakia pointed to a higher consistency and immune response towards geographically proximate strains as compared to the American strain.
• This heterogeneity of immune response could shed light on the pathological complexities of Lyme disease and aid in refining diagnostic and treatment strategies worldwide.