Three major outbreaks have occurred in recent history: one from 1896 to 1906 primarily in Uganda and the Congo Basin and two in 1920 and 1970 in several African countries.
在近代史中，该疾病共爆发了三次：一次是从1896年至1906年，发生在乌干达与刚果盆地的爆发，另外两次在1920和1970年，发生于多个非洲国家。