[Exogenous factors in the aetiology of multiple sclerosis in Cuba. A study of cases and controls].

Introduction: Descriptive epidemiological studies indicate that the prevalence of multiple sclerosis (MS) in Cuba is in the mid range of risk. It is not known what exogenous factors may be related to the aetiology of MS.

Objective: To study the exogenous factors possibly related to the aetiology of MS in the central provinces of Cuba.