strains of california encephalitis virus ( snowshoe hare subtype ) were isolated from 8 of 475 pools comprising 23 747 unengorged female mosquitoes of five species collected at three of six locations throughout the mackenzie valley of the northwest territories , canada , from latitudes 60 to 69 degrees n between 10 and 24 july 1976 .
C0028417
northwest territories
C0006823
canada