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Infection Rates of Ascocystis-Infected Aedes Triseriatus Following Ingestion of la Crosse Virus by the Larvae^*

The La Crosse (LAC) virus infection rate of Aedes triseriatus larvae that ingest LAC virus does not appear to be increased by concomitant infection of larvae by the gregarine parasite, Ascocystis barretti. Infection rates ranged only from 0–2.6% in adult Ae. triseriatus reared from groups of A. barretti-infected larvae that had ingested LAC virus (California encephalitis group) at dosages of 2.0–7.7 log₁₀ SMICLD₅₀/ml. Females resulting from orally infected larvae transmitted LAC virus to suckling mice. Larvae that were infected with A. barretti and deveoured carcasses of adult mosquitoes containing 4.7 log₁₀ SMICLD₅₀/ml failed to become infected. A. barretti spores developing in transovarially infected mosquitoes did not harbor LAC virus; thus, A. barretti does not appear to be a mechanism for virus dispersal.

Accepted for publication June 16, 1979.

^* Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, Wisconsin 53706, and by NIH Grant AI-07453.