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Am. J. Trop. Med. Hyg., 31(2), 1982, pp. 382-388
Copyright © 1982 by The American Society of Tropical Medicine and Hygiene

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Evaluation of the Efficiency of Transovarial Transmission of California Encephalitis Viral Strains in Aedes Dorsalis and Aedes Melanimon*

Michael J. Turell{dagger}, William C. Reeves AND James L. Hardy
Naval Biosciences Laboratory and Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Berkeley, California 94720

California encephalitis (CE) virus was transmitted transovarially by its natural vector, Aedes melanimon. Vertical transmission rates ranged from 13–26% in geographical populations of Ae. melanimon infected with CE virus by intrathoracic inoculation. No consistent pattern of transmission rates was detected for location or time of year mosquito collection. Vertical transmission rates ranged from 9–29% in Aedes dorsalis inoculated with CE viral strains isolated from Ae. melanimon collected in California. The month or year of viral isolation had no effect on the efficiency of vertical transmission. However, a viral strain isolated from the Owens Valley was less efficiently transmitted than strains from the Sacramento Valley, and strains from the San Joaquin Valley were intermediate in efficiency. Filial infection rates were highest in first ovarian cycle progency and declined with increasing ovarian cycles in both Ae. dorsalis and Ae. melanimon.

Accepted for publication August 21, 1981.


* 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.


{dagger} Present Address: USAMRIID, Fort Detrick, Frederick, Maryland 21701.






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Copyright © 1982 by the American Society of Tropical Medicine and Hygiene.