The diagnostic value of serum Borrelia burgdorferi antibodies and seroconversion after Lyme neuroborreliosis, a nationwide observational study

Clin Microbiol Infect. 2022 Nov;28(11):1500.e1-1500.e6. doi: 10.1016/j.cmi.2022.06.001. Epub 2022 Jun 14.

Abstract

Objectives: Clinical guidelines disagree on the diagnostic usefulness of Borrelia burgdorferi (Bb) serum antibodies (serum-Bb) in investigation of Lyme neuroborreliosis (LNB). We investigated the association between serum-Bb and Bb intrathecal antibody index (Bb-AI) and rates of seroconversion and seroreversion after LNB.

Methods: Danish residents who had a Bb-AI and corresponding serum-Bb measured between 1994 and 2020 were identified at all Danish departments of clinical microbiology. We used descriptive statistics to examine the proportions of positive Bb-AI combined with positive or negative serum-Bb antibody tests. Next, the rate of seroconversion and seroreversion among those with positive Bb-AI and either an initial negative or positive serum-Bb was estimated.

Results: We included 34 609 individuals with a Bb-AI and corresponding serum-Bb. The proportion of individuals with positive Bb-AI who had negative serum-Bb was 16.8% (95% CI, 15.1-18.6). The proportion of individuals with positive serum-Bb IgM, serum-Bb IgG, or serum-Bb IgM and IgG antibodies who had positive Bb-AI was 10.6% (95% CI, 9.5-11.8), 24.7% (95% CI, 23.0-26.4), and 45.0% (95% CI, 42.4-48.0), respectively. The proportion of children (<18 years) with positive serum-Bb IgM and IgG antibodies who had a positive Bb-AI was 59.7% (95% CI, 53.4-65.8). The proportion of individuals with positive Bb-AI with initial negative or positive serum-Bb antibodies who seroconverted or seroreverted within 2 years was 17.3% (95% CI, 6.9-27.8) and 23.2% (95% CI, 19.1-27.7), respectively.

Conclusions: Serum-Bb antibodies could not predict results of Bb-AI. A fifth of both seronegative and seropositive individuals with positive Bb-AI seroconverted or seroreverted within 2 years.

Keywords: Borrelia burgdorferi intrathecal antibody index test; Diagnostics; Lyme neuroborreliosis; Predictive value; Seroconversion; Serum antibody test; Serum serology.

Publication types

  • Observational Study

MeSH terms

  • Antibodies, Bacterial
  • Borrelia burgdorferi Group*
  • Borrelia burgdorferi*
  • Child
  • Humans
  • Immunoglobulin G
  • Immunoglobulin M
  • Lyme Neuroborreliosis*
  • Seroconversion

Substances

  • Antibodies, Bacterial
  • Immunoglobulin M
  • Immunoglobulin G