Yellow fever protection test surveys in the French Cameroons, French equatorial Africa, the Belgian Congo, and Angola

<l type="tab"> 1. The results of the yellow fever protection test survey covering the examination of 4,828 specimens in 108 towns of the French Cameroons, French Equatorial Africa, the Belgian Congo, and Angola are presented. 2. Except in the interior of French Equatorial Africa, the percentages of positive sera obtained in these colonies were much lower than in those situated in West Africa proper and previously reported upon. This difference is probably due to the fact that conditions in this region are relatively unfavourable to the maintenance of yellow fever infection. 3. Though ext... Mehr ...