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Comparative Efficacy of Certain South American Aëdes and Haemagogus Mosquitoes as Laboratory Vectors of Yellow Fever¹

Aedes leucocelaenus Dyar and Shannon is shown to be an efficient vector of yellow fever virus, producing fatal infection, by bite, in laboratory animals.

On the basis of an assumed transmission rate of 1.00 for Aëdes aegypti, the following transmission ratios were obtained: Aëdes leucocelaenus, 1.29; a mixed group of Haemagogus capricornii and H. spegazzinii, 0.73; H. equinus, 0.45; Aëdes scapularis, 0.31; and H. splendens, 0.16.

¹ The studies and observations on which this paper is based were conducted with the support and under the auspices of the Yellow Fever Research Service (Serviço de Estudos e Pesquisas sôbre a Febre Amarela) of the Ministry of Education and Health of Brazil in cooperation with the International Health Division of The Rockefeller Foundation.