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

Michael J. TurellNaval Biosciences Laboratory and Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Berkeley, California 94720

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William C. ReevesNaval Biosciences Laboratory and Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Berkeley, California 94720

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James L. HardyNaval Biosciences Laboratory and Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Berkeley, California 94720

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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.

Author Notes

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

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