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Experimental Transmission of Trivittatus Virus (California Virus Group) by Aedes Trivittatus^*

D. M. Watts, G. R. DeFoliart AND T. M. Yuill

The mosquito, Aedes trivittatus, when fed through a membrane a trivittatus virus dosage of 10^3.4 to 10^5.5 suckling mouse LD₅₀/0.03 ml of blood, transmitted the virus to suckling mice. Virus multiplication indicative of a biological vector occurred in this species. When Aedes vexans and A. triseriatus ingested similar dosages of trivittatus virus, both the infection and transmission rates were low and virus multiplication was poor. These results, added to evidence based on virus isolations from mosquito populations in nature, indicate that A. trivittatus is the primary vector of trivittatus virus in the north central United States.

Accepted for publication July 10, 1975.

^* Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, and by NIH Grants AI-07453 and AI-0071.

Present address: Walter Reed Army Institute of Research, Walter Reed Army Medical Center, Washington, D. C. 20012.