Lyme borreliosis-associated encephalopathy

Area of Science:

• Neuroscience
• Infectious Diseases
• Immunology

Background:

• Central nervous system (CNS) dysfunction, including mild confusional states, is a frequent complication of Borrelia burgdorferi infection (Lyme disease).
• The underlying mechanisms of CNS Lyme disease, particularly the confusional state, remain largely unknown.
• Intrathecal antibody synthesis is a recognized indicator of CNS infection by Borrelia burgdorferi.

Purpose of the Study:

• To investigate the presence and diagnostic criteria for Borrelia burgdorferi infection in the CNS of patients presenting with a confusional state.
• To determine the frequency of intrathecal antibody production in patients with suspected CNS Lyme disease.

Main Methods:

• Cerebrospinal fluid (CSF) analysis was performed on 73 patients with suspected CNS Lyme disease presenting with a confusional state.
• Serological tests for Borrelia burgdorferi antibodies were conducted.
• Intrathecal antibody production was assessed in CSF samples.
• Cell-mediated immune responses to Borrelia burgdorferi in peripheral blood were evaluated in seronegative patients.

Main Results:

• Of 30 seropositive patients, only 5 demonstrated intrathecal antibody production, indicating CNS infection.
• Seven seronegative patients showed positive cell-mediated immune responses, but none had CSF antibody production.
• The remaining 36 patients with negative serology lacked compelling evidence of CNS infection.

Conclusions:

• Central nervous system infection by Borrelia burgdorferi occurs in a small proportion of seropositive patients with a confusional state.
• CNS Lyme disease is extremely uncommon in seronegative individuals presenting with similar clinical symptoms.
• The findings underscore the importance of intrathecal antibody production in diagnosing CNS Lyme disease.