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Oral and Transovarial Transmission of la Crosse Virus by Aedes Atropalpus

Jerome E. Freier^* AND John C. Beier

A recently colonized strain of Aedes atropalpus was shown to be equally susceptible to oral infection with La Crosse (LAC) virus as the natural vector, Aedes triseriatus. La Crosse virus was shown to replicate and persist at high titers in orally infected Ae. atropalpus. In addition, orally infected females transmitted virus efficiently to suckling mice by mosquito bite. Transovarial transmission of LAC virus was demonstrated by recovery of virus from larval progeny after parental females were infected either orally or by intrathoracic inoculation. Virus was recovered from larval progeny that developed from eggs produced both autogenously and anautogenously. Transovarial transmission of LAC virus to F₁ adults was also shown, and the filial infection rates were similar to that obtained with a strain of Ae. triseriatus used for comparison.

Accepted for publication December 19, 1983.

^* Present address: Yale Arbovirus Research Unit, Department of Epidemiology and Public Health, Yale University School of Medicine, P.O. Box 3333, New Haven, Connecticut 06510.

Present address: NIH Resident Consultant, Ain Shams University, Cairo, Egypt. Mailing address: USAID-CAIRO, Box 10, FPO, New York 09527.