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Chlamydia pneumoniae infection and the risk of multiple sclerosis: a meta-analysis

P G Bagos1, G Nikolopoulos, A Ioannidis

  • 1Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens, 15701, Greece. pbagos@biol.uoa.gr

Multiple Sclerosis (Houndmills, Basingstoke, England)
|August 12, 2006
PubMed

Insights

Multiple sclerosis patients show higher Chlamydia pneumoniae DNA and immunoglobulin levels in cerebrospinal fluid. However, this evidence is insufficient to prove a causal link between Cpn infection and MS.

Area of Science:

  • Neuroimmunology
  • Infectious Diseases

Background:

  • Chlamydia pneumoniae (Cpn) has been investigated as a potential environmental factor in multiple sclerosis (MS) pathogenesis.
  • Previous studies have yielded conflicting results regarding the association between Cpn and MS.

Purpose of the Study:

  • To conduct a meta-analysis evaluating the association between Chlamydia pneumoniae and multiple sclerosis.
  • To assess the presence of Cpn DNA and specific immune responses in MS patients compared to controls.

Main Methods:

  • Meta-analysis of 26 studies involving 1332 MS patients and 1464 controls.
  • Random-effects models were used to pool data on Cpn DNA, intrathecal immunoglobulin synthesis, and serum immunoglobulin levels.
  • Meta-regressions were performed to adjust for confounding factors, particularly gender matching.

Main Results:

  • MS patients were significantly more likely to have detectable Cpn DNA in cerebrospinal fluid (CSF) (OR = 3.216) and evidence of intrathecal immunoglobulin synthesis (OR = 3.842).
  • No significant association was found for serum immunoglobulins.
  • After adjusting for gender confounding, associations between MS and Cpn DNA/intrathecal immunoglobulins strengthened.
  • Variability in study results was partly explained by inadequate gender matching.

Conclusions:

  • The meta-analysis indicates a higher likelihood of Chlamydia pneumoniae presence in MS patients' CSF.
  • While findings suggest a stronger association after controlling for gender, they do not establish a causal role for Cpn in MS etiology.

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