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Transovarial Transmission of Yellow Fever Virus in Stegomyia Mosquitoes^*

Transovarial transmission of two strains of yellow fever virus was demonstrated in three colonized geographical strains of Aedes aegypti following infection by intrathoracic inoculation. Infected progeny were detected in F₁ offspring from only the first three ovarian cycles (OVC). The overall minimum filial infection rate for the first three OVC was 1:596; rates were lower in the second and third OVC. Virus survived in eggs for longer than 4 months and was recovered from progeny of three immersions of first OVC eggs. Infected progeny averaged a longer time to pupation than noninfected siblings. Transovarial transmission of virus was also demonstrated in first OVC progeny of Aedes mascarensis.

Accepted for publication June 2, 1979.

^* These studies were supported in part by Grant 2-PO1-AI-11132 and by Research Contract NO1-AI-82560 from the National Institute of Allergy and Infectious Diseases.