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An eleven-year study of the incidence and consequences of acute rheumatic fever was carried out in a country in which a uniform climate together with national characteristics of insularity, wealth, and unrestricted access to free medical care contribute prominently to the epidemiologic milieu. Study subjects were 86 children, aged four to fourteen years, satisfying criteria for acute rheumatic fever. Study methods included clinical evaluation, standard laboratory studies, and echocardiography. A declining incidence of rheumatic episodes, ranging from 1.06 to 18.6/100,000 population (average 11.2/100,000), was identified. The course of the episode was generally mild. Arthritic findings predominated (92%), followed by carditis identified clinically in 43% and, with the addition of echocardiography, in 71%. Residual valvular regurgitation, as a longer term consequence, persisted in 46% of those with auscultatory confirmation of valvulitis. No recurrences were identified. Comparison with countries of similar socioeconomic status revealed relatively unimportant differences. Comparison with nearby disadvantaged countries identified striking contrast. It may be concluded that among the contributing factors, for the improvement in the incidence and sequelae of a rheumatic episode, are an advantaged socioeconomic environment and accessibility to unlimited medical care.