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Isolation of Viruses of the California Encephalitis Virus Group from Boreal Aedes Mosquitoes *

1969; American Society of Tropical Medicine and Hygiene; Volume: 18; Issue: 5 Linguagem: Inglês

10.4269/ajtmh.1969.18.735

1476-1645

John O. Iversen, R. P. Hanson, O. Papadopoulos, Caroline Morris, G. R. DeFoliart,

Dengue and Mosquito Control Research

During the summer of 1964 and the spring and summer of 1965, California encephalitis group viruses were isolated from six pools of boreal Aedes mosquitoes collected in and near Rochester (54°N, 113°W), Alberta, Canada. Mosquitoes were collected by aspiration, by sweep-netting, and with a CO2-baited cone trap. Collections were placed on Dry Ice and shipped to Madison, Wisconsin, for identification and isolation of virus. Aedes mosquitoes accounted for 97% of 16,453 mosquitoes examined for virus. Snowshoe hare virus of the California group was isolated from three pools of Aedes communis group, and one pool of Aedes stimulans group. Jamestown Canyon virus of the California group was isolated from one pool of A. communis and from a pool of Aedes spp. The minimum vector-infection rate was 0.40 isolates per 1,000 Aedes spp. mosquitoes in 1964, 0.46 isolates per 1,000 A. communis group mosquitoes in 1965, and 0.33 isolates per 1,000 A. stimulans group mosquitoes in 1965.