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Multiple sclerosis and childhood infections
Abstract:
Migration from an area where MS is common to an area where it is rare (and vice versa) affects the risk of MS, provided migration occurs in childhood. A childhood infection might explain this effect. Therefore, the age pattern of infectious diseases in different regions was examined. A higher proportion of children showed positive titers to many viral diseases early in life in areas where MS is rare compared with those where MS is common. Also, mortality rates from a variety of infectious diseases correlated negatively with the MS mortality. Thus, infection early in life may "protect" against MS, and conversely, later infection, when the immune system has partially matured, may increase risk. MS may be an age-dependent, host-immune response to childhood infection.
Insights
Early life infections may protect against multiple sclerosis (MS). Conversely, later infections might increase MS risk, suggesting MS is an age-dependent immune response to childhood infection.
Area of Science:
- Epidemiology
- Immunology
- Infectious Diseases
Background:
- Migration patterns influence multiple sclerosis (MS) risk, particularly when occurring during childhood.
- Childhood infections are hypothesized to mediate the observed migration effect on MS risk.
- Understanding the age-specific patterns of infectious diseases is crucial for elucidating MS etiology.
Purpose of the Study:
- To examine the age patterns of infectious diseases in regions with differing MS prevalence.
- To investigate the relationship between early-life infections and subsequent MS risk.
- To explore the hypothesis that MS is an age-dependent immune response to infection.
Main Methods:
- Comparative analysis of infectious disease seroprevalence in children across different geographical regions.
- Correlation analysis between infectious disease mortality rates and MS mortality rates.
- Examination of age-specific immune responses to viral diseases.
Main Results:
- Areas with rare MS showed a higher proportion of children with positive viral disease titers early in life compared to areas with common MS.
- Mortality rates from various infectious diseases exhibited a negative correlation with MS mortality.
- Evidence suggests a protective effect of early-life infection against MS development.
Conclusions:
- Infection during childhood may confer protection against multiple sclerosis (MS).
- Infections occurring later in life, after partial immune system maturation, may elevate MS risk.
- Multiple sclerosis may represent an age-dependent host immune response to early-life infections.