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Densities of Anopheles, Sporozoite Rates in Anopheles, and Incidence of Malaria in an Area of South Carolina

During the years 1947 to 1950 inclusive, blood-positive cases of malaria disappeared from a formerly endemic area bordering the Santee Reservoir in Clarendon County, South Carolina. Anopheline sporozoite rates and densities for this period were observed and are presented here.

Previously, Sabrosky, McDaniel, and Reider (1946) noted a high infection rate in Anopheles crucians Wiedemann in addition to the recording of infective Anopheles quadrimaculatus Say in the community. Weathersbee and Frohne (1948) investigated the relationship between infectiveness and densities of A. quadrimaculatus in the same locality. Under existing conditions at that time, these authors could not determine the minimum density of this mosquito below which malaria transmission would not be expected to occur. Frohne, Weathersbee, Williams, and Hart (1950) reported continuing infections of Plasmodium in anophelines in the area in 1947 and 1948 despite the relatively low incidence of human malaria. Since this last publication, additional observations have accumulated.

¹ Address: P. O. Box 477, Manning, South Carolina.