Enfermedad de Lyme en Chile: estudio de prevalencia en grupos seleccionados / Lyme's disease in Chile: prevalence study in selected groups

The prevalence of Lyme disease in Chile is unknown. To study the existence and epidemiology of Lyme Disease in Chile. One hundred eighteen patients with signs or symptoms suggestive of Lyme disease were studied. Antibodies against Borrelia burgdorferi were measured using ELISA and indirect immunofluorescence screening tests. Positive cases were confirmed with ELISA using a purified antigen and Western Blot analysis. Human biological samples and ticks were cultured in BSK-H medium. Five patients, 3 with dermatological manifestations and two with facial palsy and other neurological symptoms, had antibodies against Borrelia, measured by ELISA and indirect immunofluorescence. However, the presence of IgM antibodies by ELISA using purified antigen, was confirmed in only one case. All sera and cerebrospinal fluids were negative on Western Blot analysis. No plasma, skin, CFS or thick culture yielded Borrelia. We could not confirm the existence of Lyme disease in Chile. Positive screening with negative confirmatory test suggests false positive non-specific reactivity or that local Borrelia are antigenically different compared to North American strains