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Multiple sclerosis and poliomyelitis. A Danish historical cohort study
N M Nielsen1, J Wohlfahrt, M Melbye
1Department of Epidemiology Research, Danish Epidemiology Science Centre, Statens Serum Institut, Copenhagen.
Acta Neurologica Scandinavica
|July 6, 2000
Summary
Individuals with a history of poliomyelitis may face a higher risk of developing multiple sclerosis (MS). This study suggests a potential link between polio and increased MS incidence, particularly in those hospitalized during adolescence.
Area of Science:
- Neurology
- Epidemiology
- Infectious Diseases
Background:
- Poliomyelitis, a viral disease, can cause paralysis.
- Multiple sclerosis (MS) is a chronic neurological disorder.
- The potential long-term health implications of polio require further investigation.
Purpose of the Study:
- To determine if a prior diagnosis of poliomyelitis increases the risk of developing multiple sclerosis (MS).
Main Methods:
- A cohort study identified patients diagnosed with acute poliomyelitis in Copenhagen between 1919 and 1954.
- Follow-up data on MS diagnosis was obtained through national registries until December 31, 1996.
- The incidence of MS in polio survivors was compared to expected rates using standardized incidence ratios (SIR).
Main Results:
- A total of 5,652 polio patients were followed for 149,364 years, with 19 observed MS cases versus 11.0 expected (SIR = 1.73).
- The risk of MS was notably higher among polio patients hospitalized during adolescence.
- Neither gender nor the acute severity of poliomyelitis influenced the observed MS risk.
Conclusions:
- While based on limited event numbers, findings suggest an elevated risk of MS in individuals with a history of poliomyelitis.
- Further research with larger cohorts is warranted to confirm this association.