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流行病学近年来,西方国家(包括日本)风湿热和风湿性心脏病的发病率明显下降,在斯堪的那维亚国家,风湿热的发病率近一百年来由十万人中每年200例下降到11例;在美国康涅狄格州,由1934～1938年每十万人中12.3例下降至1968～1972年的2.9例。在纳希维尔自1964年的14.9例下降至1969年的6.4例。在巴尔的摩,年龄5～19岁组中由1935年的十万人中40例下降至1960～1964年的23例。所有这些下降主要是由于复发的减少之故。
Epidemiology In recent years, the incidence of rheumatic fever and rheumatic heart disease has dropped significantly in Western countries (including Japan). In Scandinavia, the incidence of rheumatic fever has risen from nearly one hundred thousand 200 cases dropped to 11 cases; in the United States of Connecticut, from 1934 to 1938 per 100,000 population decreased from 12.3 to 1968 to 1972 in 2.9 cases. In Nashville, the number of cases dropped from 14.9 in 1964 to 6.4 in 1969. In Baltimore, the age group 5 to 19 dropped from 40 in 1935 to 23 in 1960 to 1964. All these decreases are mainly due to the reduction of relapse.