Infectious exposure, antibiotic use, and multiple sclerosis: A population-based incident case-control study

Area of Science:

• Neurology
• Epidemiology
• Infectious Diseases

Background:

• Inconclusive evidence exists regarding the role of infections and antibiotic use in multiple sclerosis (MS) etiology.
• Understanding potential environmental triggers for MS is crucial for prevention and treatment strategies.

Purpose of the Study:

• To investigate the association between viral infections, antibiotic use, and the risk of developing multiple sclerosis.
• To clarify the relationship between specific infections and antibiotic classes with MS development.

Main Methods:

• A population-based incident case-control study was conducted.
• Data included 547 incident MS cases and 1057 general population controls from Tehran.
• Multiple logistic regression models were employed to analyze adjusted associations.

Main Results:

• Antibiotic use for ≥14 days within 3 years prior to the index date was associated with a significantly decreased odds of MS (OR 0.69).
• Specific antibiotics like penicillin (OR 0.50) and cephalosporins (OR 0.25) showed a significant reduction in MS risk.
• A history of infectious mononucleosis (IM) was linked to a more than fivefold increased risk of MS (OR 5.7).
• No significant association was found between other viral infections and MS risk.

Conclusions:

• Antibiotic use may be associated with a reduced risk of multiple sclerosis, though reverse causation is a possibility.
• Viral infections, with the exception of infectious mononucleosis, do not appear to be significantly associated with an increased risk of MS.