Abstract
One of the objectives in the study of tick paralysis at Kamloops was to discover a species of laboratory animal that is consistently susceptible to this disease. Such an animal was needed to explore inconsistencies probably caused by differences in tick virulence or host susceptibility. Observations on infestations of adults of Dermacentor andersoni in tick paralysis areas in British Columbia, and experiments with similar ticks on large and small wild and domestic animals, have revealed the following.

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