The distribution of immunity to yellow fever in central and East Africa

Abstract

1. 1. The results of a yellow fever protection test survey covering the examination of 10,274 sera collected in ten countries in Central and East Africa are presented. 2. 2. The findings have demonstrated that yellow fever has occurred recently in the Belgian Congo, Uganda, the Anglo-Egyptian Sudan, Eritrea, Somalia, Kenya and Northern Rhodesia. Abyssinia has not been adequately studied and Tanganyika Territory and Zanzibar have been free of recent infection. 3. 3. The disease has occurred within recent years as far east as the Red Sea coast of Eritrea and as far south as Balovale in Northern Rhodesia. 4. 4. The area within which immunity has been demonstrated should be regarded as the endemic zone of yellow fever in Africa. The approximate boundary of this zone has been indicated.