Related Experiment Videos
A case-control study of multiple sclerosis
E A Operskalski1, B R Visscher, R M Malmgren
1Department of Medicine, University of Southern California School of Medicine, Los Angeles 90032.
Abstract:
We conducted a study of 145 persons with multiple sclerosis who had been identified in a 1970 survey and 145 friend controls, to investigate whether the development of MS was associated with exposure to uncommon viruses or an older age at infection with 1 or more common viruses. The most striking finding was a strong positive association for history of infectious mononucleosis (IM), suggesting older age at exposure to Epstein-Barr virus, the most common etiologic agent of IM. We also found significant positive associations for number of different domiciles before adulthood and for visits outside the United States; both would be compatible with an increased likelihood among cases of exposures to uncommon viruses or to multiple strains of a common agent. Cases were younger at menarche, increasing the probability of viral exposure after puberty.
Insights
Multiple sclerosis (MS) risk increases with older age at Epstein-Barr virus infection, commonly causing infectious mononucleosis (IM). Environmental factors like travel and multiple homes may also play a role in MS development.
Area of Science:
- Neurology
- Epidemiology
- Virology
Background:
- Multiple sclerosis (MS) is a chronic neurological disease with complex etiology.
- Potential environmental factors, including viral infections, are investigated for their role in MS development.
Purpose of the Study:
- To investigate the association between multiple sclerosis and viral exposures.
- To explore if an older age at infection with common viruses or exposure to uncommon viruses influences MS risk.
Main Methods:
- A case-control study involving 145 individuals with multiple sclerosis and 145 matched controls.
- Data collected retrospectively on environmental exposures and infection history.
Main Results:
- A significant positive association was found between multiple sclerosis and a history of infectious mononucleosis (IM).
- This suggests a link between older age at Epstein-Barr virus (EBV) exposure and MS.
- Increased number of domiciles and international travel were associated with MS, indicating potential exposure to diverse or uncommon viruses.
Conclusions:
- Older age at Epstein-Barr virus infection is strongly associated with an increased risk of developing multiple sclerosis.
- Environmental factors, such as exposure to various viruses through travel or multiple residences, may contribute to MS pathogenesis.
- Younger age at menarche in cases suggests a potential for increased viral exposure post-puberty.