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Transovarial and Trans-Stadial Transmission of California Encephalitis Virus in Aedes Dorsalis and Aedes Melanimon^*

Michael J. Turell, William C. Reeves AND James L. Hardy

California encephalitis (CE) virus was transmitted transovarially by its natural vectors, Aedes dorsalis and Aedes melanimon following infection by intrathoracic inoculation. Virus was recovered from adult Ae. melanimon reared from eggs that were stored for up to 19 months and exposed to repeated freezing and thawing. Neither time since oviposition nor storage conditions affected infection rates in surviving embryos. Survival rates were highest in eggs stored at 4°C. Transovarial infection with CE virus did not affect survival of embryos, larvae or adults. However, transovarially infected larvae took longer to develop than did their uninfected siblings.

Accepted for publication January 28, 1982.

^* This study was supported in part by funds from the U.S. Army Medical Research and Development Command (Contract No. DAMD 17-77-C-7018), from the National Institute of Allergy and Infectious Diseases (research grant AI003028), from the Office of Naval Research, and by special funds for mosquito control research appropriated annually by the California Legislature. This report is based on a Ph.D. dissertation filed in June, 1981, at the University of California, Berkeley.

Present address: USAMRIID, Fort Detrick, Frederick, Maryland 21701.