Colorado Tick Fever

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Abstract
During the tick season of 1940 cases of Colorado tick fever were investigated in Boulder, Colorado. The disease is a clinical entity with characteristic symptomatology and epidemiology. Clinically it is a rather mild febrile illness with no reported fatalities. The febrile curve is usually broken by one remission of 2-3 days followed by a relapse of like duration. The present geogr. distribution is limited to the range of the tick, Dermacentor andersoni. Its seasonal distribution coincides with the seasonal distribution of this tick. The cases give a consistent history of tick bite usually 4-5 days previous to the onset of illness, and there is apparently no other source of infection revealed by this study. The actual causative agent in Colorado tick fever has not been isolated.