Serodiagnosis in early Lyme disease

Area of Science:

• Infectious Diseases
• Immunology
• Medical Diagnostics

Background:

• Lyme disease diagnosis relies on detecting antibodies to Borrelia burgdorferi.
• Erythema migrans (EM) is the hallmark clinical presentation of early Lyme disease.
• Enzyme-linked immunosorbent assay (ELISA) and immunoblot assay (IB) are common serological methods for Lyme disease diagnosis.

Purpose of the Study:

• To compare the diagnostic sensitivity of ELISA and IB for detecting Lyme disease in patients with erythema migrans.
• To evaluate the performance of these assays based on the duration of EM.
• To identify specific antigen reactivity patterns in the IB.

Main Methods:

• Sera from 100 patients with EM were tested using commercially available ELISA and IB.
• Patients were categorized by the duration of their EM (<7 days, 7-14 days, >14 days).
• Assay results were interpreted using established criteria, and seroconversion rates were determined.

Main Results:

• The IB demonstrated greater sensitivity than ELISA in patients with EM of less than 7 days' duration (25% vs. 13%).
• All patients with EM of greater than 14 days' duration showed reactivity in both assays.
• The 41- and 25-kDa antigens were most frequently recognized by IB, with the 25-kDa antigen being common in IgM blots.

Conclusions:

• The IB assay offers higher sensitivity for early Lyme disease detection compared to ELISA.
• Both ELISA and IB are valuable tools for diagnosing Lyme disease, especially in later stages.
• Antibiotic therapy did not fully prevent seroconversion in the studied patients.