Multiple Sclerosis in Olmsted and Mower Counties, Minnesota

Abstract
Recent data regarding both the incidence and prevalence of multiple sclerosis (MS) in Rochester, Minn., are presented. Previous incidence estimates (beginning in 1905) were extended through the period 1965–1974, and the prevalence of MS has now been calculated periodically for over 70 years in this community. The incidence rates have remained stable while the prevalence ratios have steadily increased. The possible reasons for these observations are discussed. The corresponding rates in the remainder of Olmsted County (outside of Rochester) and the prevalence ratio in adjacent Mower County were also estimated and compared.

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