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Ixodes ricinus spirochete and European erythema chronicum migrans disease
Abstract:
From three endemic locations of erythema chronicum migrans disease in North Rhine-Westphalia, Germany, we recovered 19 isolates of a spirochete from Ixodes ricinus ticks. The infection rate in adult ticks was 16 percent. The isolated spirochete is immunologically related to the Ixodes dammini spirochete, Borrelia duttoni, and Treponema pallidum. Using indirect immunofluorescence, the sera of 90 patients with erythema chronicum migrans disease showed antibody titers against the isolated spirochete, which correlated with the clinical course. Similarly, antibodies were demonstrated in the sera of 21 patients with acrodermatitis chronica atrophicans. These results suggest an etiologic role for the Ixodes ricinus spriochete in European erythema chronicum migrans disease.
Insights
Researchers identified a spirochete in German ticks, closely related to known pathogens. Antibodies against this tick spirochete were found in patients with erythema chronicum migrans, suggesting it causes the disease.
Area of Science:
- * Infectious Diseases
- * Medical Entomology
- * Microbiology
Background:
- * Erythema chronicum migrans (ECM) is a tick-borne illness prevalent in Europe.
- * The specific causative agent of ECM in Germany remained unclear.
- * Ixodes ricinus ticks are common vectors in the affected region.
Purpose of the Study:
- * To isolate and characterize spirochetes from Ixodes ricinus ticks in endemic ECM areas.
- * To investigate the immunological relationship between isolated spirochetes and known pathogens.
- * To determine the presence of antibodies against the isolated spirochete in patients with ECM and acrodermatitis chronica atrophicans (ACA).
Main Methods:
- * Isolation of spirochetes from 19 Ixodes ricinus ticks collected from three endemic ECM locations in North Rhine-Westphalia, Germany.
- * Immunological cross-reactivity testing against Borrelia duttoni and Treponema pallidum.
- * Indirect immunofluorescence assay to detect antibodies in patient sera (90 ECM patients, 21 ACA patients).
Main Results:
- * A spirochete was successfully isolated from 16% of adult Ixodes ricinus ticks.
- * The isolated spirochete showed immunological relatedness to Ixodes dammini spirochete, Borrelia duttoni, and Treponema pallidum.
- * Antibody titers against the isolated spirochete were detected in 90% of ECM patients and 100% of ACA patients, correlating with disease progression.
Conclusions:
- * The isolated Ixodes ricinus spirochete is strongly implicated as the causative agent of European erythema chronicum migrans.
- * The findings support an etiological role for this tick-borne spirochete in both ECM and ACA.
- * Further research is warranted to fully elucidate the pathogenesis and transmission dynamics.