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To test the performances of new Borrelia garinii immunoblots specific for Borrelia burgdorferi sensu lato with a selected panel of sera from patients with various clinical presentations of
In order to establish the sensitivity and the specificity of these immunoblots, we tested serum samples obtained from patients with early- and late-stage
Lyme disease (erythema migrans n=35, neuroborreliosis n=61, acrodermatitis chronica atrophicans (ACA) n=27 and arthritis n=41), from patients with diagnoses and laboratory findings associated with serologic cross-reactivity to
Lyme disease (syphilis n=12, Epstein-Barr infection n=9, autoimmune markers n=29) and from blood donors residing in regions of low and medium endemicity (n=80, n=100).
The combined sensitivity (IgG and IgM) of the tests was 90% for patients with erythema migrans, 92% for neuroborreliosis, 96% for ACA and 100% for
Lyme arthritis. The specificity of the IgG immunoblot was 94%, and that of the IgM immunoblot was 97%, taking into account the prevalence of borrelia antibodies in the overall population. Interpretation of these immunoblots is based on scores allocated to different specific borrelia antigens.
The Western blot technology is extremely useful in dissecting the immune response to borrelia infections, which develops gradually over a period of weeks to years and which involves the appearance of IgM and IgG antibodies directed against a number of borrelia-associated proteins.