Dengue fever shares with malaria two important traits. Firstly, its pathogen is transmitted from man to man by mosquitoes that bite and suck blood. Secondly, no vaccine exists as yet. From the point of view of case management there are two essential differences between the two diseases. Dengue is an acute infection; hence, follow-up plays a lesser role in its case-management than in that of malaria. Moreover, only symptomatic treatments exist. Therefore treatment is not a measure for reducing transmission by reducing the number of sources of infection; it has no epidemiologic bearing on the disease. For this reason we shall not take up the subject of its treatment.