Abstract
1. 1. A description of the occurrence of dengue in the East African Command, during the years 1941–1945, is given. 2. 2. Dengue was, for the greater part, confined to a few localities in which Aëdes mosquitoes were specially prevalent. 3. 3. A description of the clinical features of the epidemics in Madagascar is given. 4. 4. Dengue was almost completely eradicated by Aëdes control in the two major epidemic localities; but while in the one case it disappeared when the Aëdes index had fallen below 10 per cent., in the other case it disappeared only when this index had fallen below 2 per cent. 5. 5. The Aëdes index requires interpretation before its significance as a measure of the probability of transmission of Aëdes-borne disease can be accepted.
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