Abstract
Multiple sclerosis (MS) is an autoimmune disease that differentially affects women, people 30-60 years old, and Caucasians. Evidence indicates that it is a complex disease determined by both environmental factors and genetic susceptibility. People across the United States have expressed concern about perceived clusters of MS in their communities and the role of environmental exposures in the development of the disease. The Agency for Toxic Substances and Disease Registry (ATSDR) has funded several studies to address this issue, including a cluster investigation, several prevalence studies, and a case-control study. The cluster investigation illustrated that there are few data regarding the number of individuals with MS in the United States. Prevalence studies were conducted in Ohio, Missouri, and Texas to address this deficiency. The results support a regional difference in MS prevalence, although the reason for this difference is unclear. The results also underscore the need for additional epidemiological information about the distribution of MS in other areas of the United States and information on the underlying etiology of the disease. A case-control study is currently being conducted to examine potential risk factors for MS, including the role of environmental exposures and genetic susceptibility. Future research on MS should focus on large-scale studies and include collaboration among researchers with varied fields of expertise, such as epidemiology, neurology, and genetics.
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