Objective:

To explore the association between specific periodontal pathogens and disease severity in patients with multiple sclerosis (MS).

Key Findings:

• Higher abundance of Fusobacterium nucleatum in MS patients is linked to greater disability as measured by the Expanded Disability Status Scale (EDSS).
• Patients in the highest quartile for F. nucleatum abundance were significantly more likely to have an EDSS score of 4 or higher.
• No significant associations were found between disability severity and other studied periodontal pathogens.

Interpretation:

The study suggests a disease-specific association between F. nucleatum and disability in MS, potentially influencing immune responses through pro-inflammatory pathways.

Limitations:

• Cross-sectional design limits conclusions about causality.
• Lack of formal periodontal examinations.
• Relatively small sample size.

Conclusion:

Further studies are needed to determine the role of oral microbiota in MS progression or severity.