Cache Valley Virus in the Del Mar Va Peninsula

IV. Biological Transmission of the Virus by Aedes sollicitans and Aedes taeniorhynchus

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  • Department of Virus Diseases, Walter Reed Army Institute of Research, Walter Reed Army Medical Center, Department of Entomology, University of Medicine, Washington, D. C. 20012

Laboratory-reared Aedes taeniorhynchus and Aedes sollicitans were readily infected with Cache Valley virus after ingestion of artificial mixtures of virus and defibrinated rabbit blood. Whereas some mosquitoes were infected with as little as three infective doses, 13 to 30 doses regularly infected all mosquitoes. Evidence for proliferation of ingested virus was obtained for both mosquito species; virus increased 100- to 500-fold over 10 to 14 days of extrinsic incubation. Infected mosquitoes regularly transmitted the virus to suckling mice by bite 6 to 10 days after feeding on infective blood.

Author Notes

Present address: Department of Veterinary Science, University of Wisconsin, Madison, Wisconsin.

Present address: Entomology Research Division, Agricultural Research Service, U. S. Dept. of Agriculture, Beltsville, Maryland 20705.