Abstract
sharply localized and could be correlated with the presence or absence of the golden-mantled ground squirrel (Citellus lateralis tescorum). This rodent was found to be the principal carrier of CTF virus and the preferred host of immature stages of the tick vector, Dermacentor andersoni. In areas populated by this squirrel, incidence of infection in adult ticks collected from vegetation was as high as 16 per cent and virus was isolated from golden-mantled ground squirrels as well as from other rodents such as Columbian ground squirrels {Citellus columbianus columbianus), chipmunks (Eutamias amoenus), one pine squirrel (Tamiasciurus hudsonicus richardsoni) and one deer mouse (Peromyscus maniculatus). In 1959, similar studies were conducted in 3 of the areas to confirm previous findings and to record any changes that might have occurred in host-vector relationships. The following ecologic data were collected in these areas during 1958:
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