Abstract
An arbovirus survey was made of 7 areas in western Utah. From 215,150 pooled specimens of mosquitoes and the biting midge Culicoides variipennis, 307 arboviruses were isolated. One was an alphatogavirus (western equine encephalitis), 256 were California serogroup, and 50 were Bunyamwera serogroup (35 Main Drain, 9 Lokern, and 6 Cache Valley) viruses. Aedes dorsalis accounted for 47% of the total pooled specimens but represented 91% of all California serogroup viruses, 64% of which were from Blue Lake where Ae. dorsalis constituted 84% of the pooled mosquitoes. Ditto Dunes accounted for 66% of the Main Drain viruses, most of which were from Psorophora signipennis. Most Lokern viruses were from C. variipennis from Fish Springs and Callao, and most Cache Valley viruses were from Culiseta inornata from Hickman Canyon. Precipitin results on 347 blood-engorged mosquitoes and on the biting midge indicated that for all feedings, 47% were by Ae. dorsalis and 48% were on rabbits.
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