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Comparative Susceptibility of Eight Mosquito Species to Sindbis Virus^*

An evaluation of the susceptibility of eight mosquito species to Sindbis virus was conducted as a prelude to studies on the mechanisms of arbovirus infection in mosquitoes at the cellular and molecular level. Culex tritaeniorhynchus was the most susceptible mosquito tested, with an ID₁₀ of 2.42 log₁₀ TCID₅₀. Considerably higher infectivity thresholds were observed with C. salinarius (4.41) and Aedes aegypti (4.46), but these species did show persistence of virus which may indicate multiplication. Anopheles quadrimaculatus, An. stephensi, Aedes taeniorhynchus and Ae. triseriatus became infected only at high doses and all showed reduced virus titers after 7 days post-infection. Armigeres subalbatus were refractory to infection at all doses tested.

Accepted for publication July 7, 1973.

^* The opinions or assertions contained herein are the private views of the author and are not to be construed as official or as reflecting the views of the Department of the Army or the Department of Defense.